Iq option ou opções binarias
Just a different usage of the word, that s all. HAD, don t stop these articles. They are great despite what this muppet says. These replies are awesome other than detailless replies and some are actually trying to solve the problem or at least ask questions about the most difficult areas. I must have missed all the other times HaD dismissed kickstarters as dubious. That s quite impressive of me. I did notice a lot of very dubious projects on kickstarter though, things that get plenty of funding and then never anything is heard again.
or they make a billion from selling out to facebook. But without HAD highlighting them, I wouldn t know about these products. And if I don t know about them, I can t laugh at them. They are doing a public service here. Come on, everyone comes for the hacks, but we stay for the flame. supercap and a mini dynamo. The Dialog DA14580 BLE SoC runs on about 0.
5 μA at 3V in deep-sleep mode. Granted transmit mode is 5 mA 3V note the mbut I guess if they do it very very briefly and then go back to deep sleep it might be possible. Add a supercap and Bob s your uncle. The device just needs to send an advertising packet anyway, nothing fancy. That said they sure look tiny for an RF harvester. May be a embedded coin cell baterry in the tag.
This would give him some time to get the money until the people realized that doesn t harvest anything except his money. ; in spanish we say pelotazo maybe shot in english. Sounds like the shake lights that in the legitimate versions use a supercap about the size of a coin cell battery. The fake ones use a battery, and consequently they work for a few days then poof.
Also reminds me of the irritating motherboards with the CMOS battery soldered on. i see them in those solar powered dollar store lights, i m sure you can find them for smaller. Yes you can use ambient energy in the air to power your BT device, however you just need your ambient power to be high. IE near a radio-station, near a power line. Really you will not have enough power to actually do any real data passing, but if you harvest energy for several days, and only use it for a few seconds.
I have no reason to believe it cant work. that being said there is not a big enough antenna to be broad band enough to actually harvest meaningful amounts of energy. The narrow band power an average device is around is so low you would never be able to gather meaningful amounts of energy, but the power across the spectrum may be enough. when collected over a few days.
My opinion with respect to power the radio off BT power Impossible, you are talking about using -40 to -80 dBm of BURST rf power at duty cycles of Report comment. What about the a c in house power lines. The problem is that the antenna for energy harvesting would need to be quite large. Ideally, yeah. In practice, no. The 50Hz is so prominent that without proper filtering it gets everywhere in electronic Ccts, regardless of their size.
A full wavelength antenna at 50Hz would be 5995 Km 3725 miles. I was thinking about inductive coupling, you dont need a huge amount of energy to make this work, but you do need more then is available via the packets you are receiving. In the near field a transformer coil is sufficient. Even in the far field a tuned-loop can do. But I m not sure there is actually that much noise energy down in this range in comparison to that which comes from intentional radiation.
why couldn t they use a coin cell rechargeable. Impressive statement but any antenna picks up all frequencies it is only the filters that take unwanted frequency energy out and feed it back to ground while isolating the wanted group of frequencies. So with tuned circuitry this can be picked out and channeled to a cap quite easily. Wavelengths that are too long for the antenna will only pick up with greatly reduced power. Teeny antennas only pick up very high frequencies, on which nothing is transmitted at very high power.
Yes the signals are still there but at a much much attenuated power level. And if you had a tuneable filter or filters and could tune to highest RX sig strength and harvest from that then you re onto a winner. With a wideband fractal antenna plus a bank of tuneable filters which are have their frequency pulled by a uC it could work. A uC can be extremely low power and you could have some passive signal strength monitors at common frequencies.
Kind of like how antenna diversity is implemented but swap antenna for frequency ie. dynamically choose the frequency which has the highest rssi and use that for harvesting. I hope to god you are not using enough power to generate strong enough magnetic fields to be useful for this application. i am thinking that you would need several KV and and sever a huge amount of current to make this work I am not saying it is feasible, what i am saying is it is possible to harness enough energy from the air to do things, if you are in a place that has a huge amount of energy in the air.
They don t need much energy and it s all around us, much more than they need. People have been harvesting it for years, the only question I have is what antenna they use and how it s tuned to get the best power transfer at the best frequency and the right time. Just a heads up of the latest comments of this project. I purchased 3 of the StickNFind location stickers.
They did not work very well. Many times the connection was lost and many times they could not be found. I am very disappointed in the product. these StickNFind buttons do not work as advertised. They constantly make false separation alarmseven when the button is within 12 inches of the iPhone it is paired with. have never felt more robbed. this campaign is the reason i would never fund another tech indiegogo campaign. The shape is too suspicious.
It is begging for a CR-2032 inside. My guess is they put a CR-2032 inside and lied about the rest. It is possible to use NFC but many phones, including ALL iPhones I believe, has no NFC. And NFC range is very very poor. If the company can really pull energy through thin air and enough to power BT-LE, they would have solved A LOT of problems. Their technology could easily worth Billions. Common sense says NO. Some of the people listed under our core members have strong pedigree. That is a reason to think the product will have the claimed features.
Unless some of those people come out and distance themselves from the campaign. The best energy harvesting device i ve seen using RF was a card like a credit card with a LED that light up when placed into the field of a NFC reader like you would do with a NFC tag. maybe 200ft in a vacuum, and the tranmitter is placed inside a parabolic dealybob to broadcast focused upon the reciever.
these specs are like car stereos, that will say 10,000 watts. A 200ft 60m detection range seems too much to me. and have 25 amp fuses in them. with math, when you round all your numbers up, you reach 800 watts. then you jump that to a thousand because whatever, no one regulates it. and then you put your safety mechanisms in, and limit it to 300, if the fuse is faulty and doesn t blow at quite 25 amps. regarding Our apologies. At the moment we can t offer free international shipping since we are a US based company and we have to pay both shipping fee and the export taxes to other countries outside of the continental USA.
yes you can offer free international shipping by eating the costs like many ebayers do and just tack the cost onto the item cost. have you ever wondered why the same product can go for 100 with free shipping in 1 listing and the next listing from the same user has 1 penny for the item and 100 for shipping. If it is genuine, I would hazard a guess that they are using cap-xx supercapacitors.
thanks for the link. they look quite interesting indeed. Wow, those look very cool. It s pretty impressive that they re able to cram 1200 mF into a 3mm tall package. Shame they re pretty limited to pretty much just dealing with power spikes and energy harvesters. Even so, very neat. Lithium thin film batteries still have much greater energy capacity. Based on the claimed lifetime, I m fairly certain they arrived at-it having done a back-of-the-envelope calculation in reference to a lithium-thin-film battery datasheet.
Unfortunately, Infinite Power Solutions makers of the Thinergy batteries is not doing so well and supply of the thinergy cells is scarce. ST has an EnFilm line, too, but this is not available yet. I suspect that the iFind creators have yet to realize this supply problem. I was just looking for a Thinergy battery solution but your above email has confirmed my suspicions.
Do you know of another company that supports a similar battery. Do you have any contacts of any of the previous employees. I m assuming this product line may have been picked up by another company, but if it has it s not being marketed as Thinergy. On their KS page, they say they have some patents, so I looked for them. The search is more successful with the co-founder of iFinder s company, Dr. Paul McArthur. OS PN 6788199 20 28B2 29 RS PN 6788199 20 28B2 29 To summarize, the patent is on a RFID chip, not a Bluetooth chip.
RFID doesn t require a battery from what I remember. com patents US7148801 maybe the same. says The transceiver module can also include a battery that is operable to power the second memory unit, the second receiver, the second transmitter, the second timer, and the second control unit. In one embodiment, the transceiver module is powered by radio frequency energy.
My thoughts exactly, Luc. Without a battery, this sounds like RFID rather than bluetooth. My understanding is that RFID tags ARE powered by harvested RF. Yes they are, but have a range limited to the magnetic filed of the reader. For most readers that is a few cm, but for some IE 2 W with highly directive antennas it can be a few meters. NFC normally operates up to 10cm or so having said that, you can create a device to listen in to a conversation between a tag and a reader a lot further away than that.
RFID gen 2 Tags readers there are a host of static and mobile. Think Impinj speedway, Alien Technologies, Zebra Motorola MC319Z, Nordic ID merlin, and many others. They will pick passive tags up from several meters and typically run at 0. 5W 2W depending on local laws. While not industry standard, IPC RFID tags and readers can have pretty impressive performance as well. With all RFID, a lot depends on the tag and what the tag is attached to in addition to the reader.
A tag designed to operate in free air e. an apparel swing tagwill not be happy attached to a can of fizzy drink for example and will significantly under perform. RFID tags can also be active with a power supply or passive. Passive ones are cheaper, but in more challenging environments, powered tags are an option. This is all true, but doesn t get to how they could develop a tag that could be read over UHF RFID using phones that don t have UHF RFID readers.
I work specifically with UHF RFID reader chips, and I am confident that there are no existing reader chips that are considered acceptable for smartphones, let alone in existing phones. Restrictions include size and power consumption. Even if we did have UHF RFID reader chips in our phones and I hope that one day we will they wouldn t achieve BTLE read ranges, which the KS campaign promises. Moreover, they explicitly state they are using BTLE. My money is on overly optimistic designers or outright vaporware.
I would give this project a 2 chance of meeting its promises, and yes, I d be happy to put money on it. The following video seem to be a first draft of their kickstarter video. take a look at what the narrator says at 2 55 and compare it with the original kickstarter video. - It utilizes a combination of rfid bluetooth technology vs - It utilizes bluetooth technology.
which would indicate a Gen2 BLE style hibrid nonetheless it would only work as long as there were Impinj portals nearby to act as wireless charger for a battery that shouldn t exist now this would make the whole thing a lot more plausible. Unfortunately they are specific saying it s not RFID either on the comments. My best guess is that they re hoping the tag will normally live in your pocket next to your phone and be able to suck up the radio energy and store it in a battery capacitor to tide it over when it s away from a power source.
Pocket energy is maybe up to 2W for GSM 3G only inches away from your tag device, brain, genitals, etc So can be pretty helpful for charging your tag or making you infertile or stupid Do we really believe those claims any more. I expect if you leave the tag in a field and expect it to work, you ll be disappointed.
That s an excellent suggestion Max. Except the 2 Watts is only when you are in a call, and only when you are using low band GSM, and that is typically used only when you are using voice calling, AND it is designed to work at the minimum usable power, so you only will get 2W when you are at the edge of all cell towers in your area. So mostly this is a really really poor assumption. I think it may be a safe assumption that the KS creators are suffering from quite a few poor assumptions.
They mention shaking the tag to find your phone. Is it possible they ve got a small kinetic energy generator in the device that s harvesting energy. Everyone seems to be jumping straight to RF energy harvesting. If there is a small enough generator, and a supercap, I could see attaching the tag to stuff that s always on the move, generating energy. From his patent III. The basic circuit is connected to an onboard power source 116 a battery, such as a coin cell battery, a double layer capacitor, a lithium ion battery, or a thin film battery.
Based on unique power conservation programming algorithms, even the most basic device has an operating life in active mode of at least three months six months for average useThis life is extendable using a power harvesting component 117 operating via a light sensitive component e. a solar cella RF sensitive device e.
a coil, antennaa mechanically sensitive device e. a piezo-electric PZT, a bimorph, a ceramic, a coil with a magnet or temperature sensitive device e. Using ambient vibrations picked up by the piezo buzzer as a power source. I wonder if anything has done that before. Prior art would involve going wayyyyy back to the early telephones that ran on voice power and used the speaker for a microphone.
I don t think anyone is jumping to the RF harvesting it s right on the company s blog they posted a link in their KS update. how do you shake it if it is lost. The idea is that you shake it if you _have_ a tag, but you ve lost your phone I m deeply suspicious of this project s claims of running on harvested energy. It ll be interesting to go back well after the funding date and see what s happening in the comments.
The idle power consumption isn t really relevant it wouldn t be running idle, it would simply be off most of the time. No need to listen all the time for a ping, if it listens once every couple of seconds that s fine. It s more a question of whether you can build a rectenna that small which can deal with the leakage currents in the threshold detection circuitry, power switch circuitry, rectifiers and whatever capacitor you use for storage ultracaps seem right out.
It needs to be in idle since it has to wake up when contact is attempted, when you want to try to find the tag. Most uCs have a sleep and watchdog wakeup timer. And when those are enabled you have an idle power consumption. Hench the idle consumption remarks. still, a periodic wakeup timer can be implemented with an average current draw of only about 100nA, much less than the 10uA quoted above. Which draws a small amount of power, but firing up the RF receiver will draw a few mA for a few milliseconds.
Thus the 10uA average. How do you synchronize the wake listen for pings every few minutes. It would go into a sleep mode, but it does not turn off the radio completely. You wake up every 5 seconds, only long enough to recognize a signal maybe a couple milliseconds. Your transmitter broadcasts for 6 seconds when pinging, no need for any synchronization.
The very successful Sticknfind campaign It may have been successful, but from the reviews I ve seen they are rather cheap and suck. Also Sticknfind has failed to deliver their other products they claimed where nearly complete over a year ago. I backed this project, can confirm they have some bugs. It s probably a rechargeable battery. Since the theory is that t will get recharged over and over the user will never have to replace it. As such its magic to the user and they can say, look over here, user, there s no battery that you need to worry about and its the coolest thing ever.
OBVIOUSLY, they found Tesla s old energy transmission towers, and are planning to stand them up and get them working. Considering that I build a device not too much different than iFind at least from a basic perspectiveand I know the state of the art for wireless energy harvesting as well as anyone does, I would be VERY hesitant to pre-order one of iq option ou opções binarias. Let s look at other BLE trackers, Stick n Find and Tile, and then compare the state-of-the art to the pie-in-the-sky claims of the iFind.
Stick n Find Stick n Find has had a disastrous reception from its users. In my testing, it has about one or two months of charge in the 2016 cell, and it is basically impossible to replace it. The range is about 10-15m. Tile Tile needed to enlarge their device substantially in order to accommodate a CR2032, needed to have one year battery life, and in order to enlarge the antenna to get a mere 30m range. Tile is now looking like 38 x 38 x 6mm or so. Looking more deeply into this iFind, the solution size of a rechargeable battery, the charge controller IC, and the energy harvesting element is too thick for their quoted dimensions.
In 2012 when I was beginning the designing my product, I had even prototyped lithium-thin-film batteries, but these are still impractical for a bunch of reasons I won t go into. If you pre-order this product, it will either never ship, or it will ship in a form completely different than the one that is promised. In the FAQ they have another suspicious claim Is there any Visual alerts for people with hearing issues.
Yes, the iFind App does have a visual locating display showing the estimated direction and distance. I m not aware of any phone that has direction finding RF capability. And how about some image analysis. On the top image, the apple keys 15 x 15 mm are very close to 15 pixels tall and wide. The iq option ou opções binarias is only 26 22 pixels, meaning it is smaller than the 32x27mm stated.
Comparing the cat s paws to the tag would mean the cat s paws would be almost 2. 5 long and it s head close to 7 across. That s one big cat. Considering that Kickstarter prohibits renderings of final products, I m throwing a flag there. Using the phone compass and RF strength while turning about with the phone will be able to give you a good approximation ignoring multipathing etc of RF direction, so there you go. Also the same thing with distance with regards to RF strenth received.
All approximations but would be good enough to provide a showy app if the tag works. Antennas in phones are not directional. and multipath does not guarantee that getting closer to the phone means stronger signal. Sigh, no they are not, however, with a weak signal like low power bluetooth, and you in a room swinging a phone about, you will be an effective shield at the 2.
4 ghz it operates at, turning yourself and the phone into a hokey approximation of a directional antenna. As I mentioned, mainly gimmick, but it does have a little basis to work with. Some of you mention that you don t like the can this kickstarter claim be for real postings, but I, for one, find the discussion on these kind of topics very interesting. Clearly there are some very intelligent and resourceful posters on HaD and I always end up learning something new from the comments posted.
I discovered many interesting things thanks to our readers. The following is from the iFind FAQ. Is it possible that the battery of iFind tag dies. To begin with, iFind tag doesn t have a battery. Instead, it uses our patent pending EM Harvesting technology and stores the energy in a uniquely designed power bank. In other words, iFind tag powers itself.
- In the worst case scenario, let s say you lost your tag in the middle of a remote desert, where there s no EM wave at all, the tag will still hold power for days. Power bank sounds like flim-flam for battery. remote desert where there s no EM wave at all Um, unless it was underground as well, there s still light, which is EM.
Not to mention the strange grammar of that sentence. Also the fact that there is plenty of EM in every desert on the planet, even in Antarctica. The trouble with RF harvesting is that there just isn t that much energy available. Assuming that the noise floor in the 2. 45 GHz band is a consistent -90dBM Hz, that is barely enough to power a BLE device assuming that the conversion to DC is near-perfect.
The other problem is that the 2. 45 GHz band, as noisy as it is, is only a consistent -90dBm Hz in truly noisy environments. Even if the conversion was 100 efficient, I don t see how the device could harvest enough power to function. According to their FAQ, the power bank will last for days even without EM. They also indicate their app will display the charge level of any tag s power bank. I m almost 100 sure the power bank they are considering here is a Lithium Thin-Film battery.
Anyway, I m less skeptical that it s possible than I am skeptical it can be done in the form factor they specify for the price they offer. 45 GHz band alone, it is conceivable to build a device in this form factor, but not for 14 and not reliable. Using multiple RF bands for input energy requires multiple antennas and multiple tuning circuits, though, in addition to a somewhat exotic semiconductor chemistry to pass multiple bands in far away spectrums.
So high cost. com good-true-tour-ifind-battery-free-feature This page attempts to explain the device s EM harvesting. However, the explanation lacks any detail whatsoever. Even with a really efficient horn, in a development environment running hundreds of devices on BT and with several wifi AP, i don t think i have ever seen 90 dBm Hz using an efficient antenna. Typically i see 90 dBm 10KHz or less.
And yes i have done the math one this one several times. Even adding moving to cell band, the bandwidth you would get a tiny amount of power. If it communicates at 2. 4GHz, why would you limit the power-reception to that frequency. Why not make a very wide antenna rectenna. From lets say 17. 1800MHz, up till 100GHz. Using lower frequencies 88-108MHz transmitters for example is not really useful for a battery free small tagsince your antenna construction would be larger.
The trade-of is size weight versus power. NFC tags can communicate at several meters. not centimeters. They actually do mass check-in out for people at train stations in some countries, using big antennas above for example escalators. And take a look at CherrySwitches, they make produce energy harvesting switches, and NXP the IC s.
Cherry even has 802. 4 supportive switches. Through Cherry itn t using RF. It s a option. and commercially available. I ll think those BLE energy harvesting tags could exist. To make a quick addition. Check out NXP EnOcean. I don t see any problems with those BLE tags. Those examples do not harvest energy from RF signals. They convert the energy from the mechanical force when you push the switch lever.
Looks like at least 1500 backers, at time of writing, are all going to get ripped off. To what degree of ripped off is yet to be seen. It s all too good to be true and some people obviously don t realise where the limits of current technology are to be able to compare this to. Their ignorance will be their undoing, quite right too, suckers.
All very plausible Antenna Wideband fractal printed on their PCB substrate. Compact and can be very wideband. Low input V, low Iq, boost converter Linear Tech do a few for energy harvesting apps. htm BLE silicon Plenty around. I think it becomes unbelievable when they make out that it s got an endless source of power.
It does kind of there are EM waves everywhere but that endless source of power is very very low. Their energy storage component will deplete pretty quick should that loud beeper keep beeping for a few mins and you keep polling the BLE tag. In summary, it s all possible but they need to ensure they include some caveats and manage expectations. Once the energy storage component is fully depleted I wonder how long it takes to charge it up again say, to a point where it can communicate and power its beeper.
VHF and UHF tv transmissions are consistent power sources, and I ve seen videos a device powered off TV signals. But all it could do was flash an LED, and it had a dipole antenna that was about 20cm long. So I think given the size and power requirements, I d say it s bogus. To be fair, it s probably at least an order of magnitude more current to flash an LED vs the 10uA required for BLE idle. I know it is not a hack, but I still enjoy seeing the reasons how WiFi GSM DVB-T ATSC can never generate enough power to power up a BLE device.
Yeah, it s a good brain workout, when those who know start explaining exactly why it won t work. Gives some of us a bit of extra knowledge in a new area, which is always worth having. Interesting, it reminds me of the Lunacase, also on kick starter. It s a case with a few LED notifications built in but no power source, rather claiming to rely on the elctromagnetic radiation from your phone.
i remember five-ten years ago having a pen that had a LED at the back that would light up whenever there was an incoming call on my cellphone or any phone within 5 meters running completely passive only on GSM harvested energy yes, i did rip it apart eventually to verify, it was an awesome piece of chinese hackery. I see no reason why this shouldn t work with BTLE. Oh yeah, those horrible little dongles were everywhere, every street-corner vendor of low-quality cellphone accessories at least.
I thought they had a battery inside. Most did, but I also recall a device like this in the form of a sticker that one would place on the phone s case near the antenna that seemed far to small to contain a battery. I could be wrong. I also seem to recall said device claiming to reduce harm to the user caused by the phone s radiation. They aren t passive. They have a tiny battery in. I pulled a Disney Mickey Mouse one apart for a PC mobile-phone activated on switch.
You basically use a antenna and a diode detector to trickle charge a battery via remote RF illumination. It should be doable. BTW, this is kind like how those NSA retro-reflector bugs work. There is no voltage in that, you will never trickle charge anything. you need your voltage to be stepped up above your battery voltage.
Stepping up from a few tens of mV is easily done and at good efficiency. Many manufacturers, such as Linear Tech, make these DC-DC boost converters. I really don t see an issue with their claims TBH. What is suspect is that they aren t giving any caveats with them. Nobody ever consider using a Joule Thief for power management.
They are ridiculously inefficient, so it is unlikely that they could be used in something like this. You stole my thunder. I was gonna recommend a joule thief. Of course it could be an orgone-energy RF joule thief a jouluminous ether-thief, if you will. Even ignoring the battery or lack of the are also couple of other things a-miss here. Firstly the size. They mention it is 2. 4mm thick, now assuming it s injection moulded then there will be a minimum wall thickness of about 0.
7mm reducing the internal space to a mere 1mm. I would be amazed if they could all the required circuitry and also a buzzer at least a buzzer that s louder than a flea s fart in that space. Especially considering the space which needs to be left around the BLE antenna for it to work properly. Secondly throughout the video the bluetooth icon never comes to life when they are demoing the app.
May just be for video purposes but still odd. Thirdly the 200ft 60m range claim. Now in an open area it is definitely possible to achieve this distance with a standard spec BLE antenna with the TX power set around 5dbm, however it would be a very unstable connection, and would drop out if you looked it the wrong way. In the real world usage, like for example when you put your phone in your pocket, you would not really see more than 100ft 30m.
Could be molded around the PCB instead heat problems with that, of course, although maybe some thermosets would be tolerable. Could be vacuum formed. Rigid thin plastic makes a fairly good mechanical gain medium to make the beeper louder. Could be pressed metal but is electrically conductive and would interfere with EM absorption unless they re being reeeeeally clever. Funny diplane antenna with plastic spacer. And it s biodegradable, too. Not saying that the Kickstarter has access to Israeli army research because that would be highly unlikelyjust pointing out that Quantum Tophats might be around sooner rather than later.
For better lack of a description it seems like they have overclocked or hacked what we would traditionally identify as RFID to be compatible with the bluetooth 4. Maybe some kind of motion-energy capture too. They mention shaking the device to sync it so perhaps thatch also used in piezo energy. Ah, you beat me to it. I was going to suggest the motion generator a number of really small shake-activated generator projects out there. The little generator just needs to get bounced around regularly to pick up a little charge.
I don t see where the awake vs asleep times are specified for this. Could it be that they charge a small storage device they say no battery so maybe supercap. During active, bouncy times the tag gets juice regularly, but as the cap discharges the cycle gets longer. Still wouldn t be bad for something like tagging keys that get bounced around a lot. I would think that you could potentially harvest more energy from motion than you could from background EM. com good-true-tour-ifind-battery-free-feature clearly states that it draws it s power from multiple EM spectra.
I am using EM harvesting in a product of my own. I use a special transducer that is 20 efficient, and it can harvest energy across a 500 Terahertz. patch of spectrum. The active surface area is 20x6mm, and it optimal conditions I ve observed it to deliver a battery charge current of 4. Yep, it s a solar panel. If you want a cheap way to harvest a lot of energy, it s really the best way to go.
Even indoor lighting provides way more energy than virtually every other harvesting method there is. Yep, I m betting they re concealing a small thin-film solar cell. Though it would be FAR cooler if the little tags had a beta-decay battery. It can t be only a solar cell, since the promotion video shows a tag being tucked into a compartment in a wallet.
But maybe their device will rely on several different harvesting methods wireless signals, solar, motion. This is rf harvesting tech coming out of U Illinois and is probably what they are using. Problem is, per the paper, this seems to generate about 460 mV, rather than the 3 volts used by the BLE. If the HAD math of 30uW listed above is the norm for idle draw, then the amount of current they would have to be able to harvest would seem even more unattainable.
I think we re talking 65 uA. Remember the crystal am radio. I know it had a huge coil ant I think it could be done. At under 20 not yet. Miniature size cost money. I was thinking along the same lines. A crystal radio is a classic example of powering a device using only the signal itself. However, as you mention, they typically use a large antenna and only generate enough power to drive a tiny, very sensitive speaker.
Maybe they use a printed battery, the capacity is very low. 2mAh 3V for this size, but for being dormant 99. 99 of the time that is good enough. RF energy harvesting seems unlikely to me with typical ambient fields in households. The fact that these guys are showing this SparkFun Electronics, Inc. Accelerometer BreakOut board as the only glimpse of their Engineering says much about their naiveness toward hardware development or better yet faking it.
And that s not because of the 3uA they re adding while in sleep mode and 400uA when operatingnot because the current price of this accelerometer would be around 10 their SELLING PRICE or even the EXTREMELY questionable choice of a 3 axis accelerometer given that they don t need to detect orientation just shaking and are on such a tight power budget. Coup de grâce The component in question is on its EOL EndOfLife no engineer in his right mind would use a EOL parts for a project like this so my guess they don t have any engineers working on it.
Tracking down the people responsible for this project. jpg that it was pretty good for a couple of idiots with a camera on his timeline. none of them live in Texas. This is an outstanding bit of investigation that I wish more folks on this thread would discuss. zwang119 2nd year PhD student. Yuan Song lists under sports Sitting on my Ass and seems to be spending his time playing Fallout 2. It just doesn t scream lean-mean-startup. More green-paint-mashup.
Also on KS Atlas Wang s profile says Atlas is a Ph. One only becomes a Ph. candidate at least in the US once you propose your thesis to the committee. Also his expertise doesn t scream low-power RF, energy harvesting etc. Something is fishy indeed. candidatehowever his webpage clearly articulates that he is only in his 2nd year and probably hasn t even completed his qualifier. Would you mind if we wrote about this on drop-kicker.
com and credited you for the research. Be my guest Michael. html these are great resources on the subject. Dr Paul McArthur first among equals at iFind seems to have an extremely low net profile for someone who has taught at Univ of Utah in 1989-90. and been in management positions at Freescale and Philips according to his bio. Yet he declines to state where he did his undergrad and graduate degrees, and has no Linkedin profile.
He claims to have had his identity stolen and is thus reluctant to divulge much online. Let s say the device requires 10mA in active mode. A BLE announce transmission is Report comment. How do I replace the battery. That s really good work. The top of the Stick-N-Find twists off just like bottle top. It is then a simple matter of removing the old battery and replacing it with a new one. The good place to argue about their lie. Dave jones couldn t ship his uCurrent internationally with a cr2032 because it was in violation of some law not sure which one, shipping lithium batteries by airfreight.
but if the ifind does have a battery then they will be in violation of that law. I always have been skeptical of anything with a cool name and an even cooler graphical presentation but accompanied by the absence of any technical detail. It usually indicates they re spending the most money time on presentation which is common practice among fraudsters. Sticking a lowercase i in front of a word is not a cool name. It s a lazy ripoff of a very tired old Apple gimmick that needs to just go away.
I think that anything that helps promote iq option ou opções binarias thinking and discusses good design practice is a good thing. Please continue posting these on HAD. Clearly their plan is. Create fake kickstarter pitch 2. Tip off HAD 3. There is an xkcd comic in there somewhere. Read through the comments to find easiest way to actually build this. seems like a big lie to me. Looks a lot this. These only last one year. I thought these were a new version of the tile for a minute.
Cymbet make tiny solid state SMD batteries 3. Which easily could be used in order to harvest the energy to, would fit as well, though im doubting using the bluetooth and the buzzer at the same time, seems a long shot to get it loud enough. The FAQ on their website contains this How long will my iFind last. TWO DECADES, as long as it is not subject to extraordinary physical abuse. I wonder if this is referring to physical wear and tear, or to the the power supply.
Not sure, could be the rechargeable battery. It could also be a calculated MTTF figure. It doesn t look like anything you would do, and I hope it is not from the Hackaday Team kck. They re claiming they have received an email threatening one of their personnel. according to them it s for real. I wasn t even expecting a reply, so. I sent them an email asking for clarification on the math of the whole thing and asked them if this was a publicity stunta scam or if they really believed that this was possible And to give them a chance to Scientifically defend themselves I try to always follow Carls Sagans scientific skepticism, meaning that if they convince me of that it is possible I would endorse themI asked for evidence.
They did clarify however that the person who shot the video and was stating on facebook that it was not too shabby for a few idiots with a camera isn t with them is not part of their company so they weren t mocking their backers on facebook. I then replied that I did not want to see their device nor was threatening anyone I did say that if they couldn t convince me I d report their project to KickStarter, which in my mind is more than a reasonable action based on the total lack of evidenceAnd that what I want is the maths behind their amazing claims regarding psu and their theoretical supply current.
Really, if I were involved in a commercial project, where my own financial well being was based upon it succeeding, then I wouldn t tell anyone how it works either. Try asking Samsung how their HW achieves their claimed battery life they won t tell you. Again, their claims seem valid ie it can work. It s not a new science and their theory of operation has been proven many times. What is dubious and is a glaring omission is the use cases and caveats.
What I mean is details regarding what the tag can do and how often. If they claim it can operate in rope mode, flash it s LED, beep its beeper etc continuously ad infinitum then that would appear to be a challenge and would require a consistent few mA which is unlikely from ambient RF. This would deplete the battery energy store after a while as the RF harvesting is unlikely to replenish it quick enough. I think the devil is in their lack of detail.
The problem isn t the energy harvesting technology itself as you stated Linear has some very interesting regulators that could potentially be used to trickle charge low leak caps or even one of those Battery Life Extenders LTC3330. The problem is the claims that they don t have any battery or supercap and just like you said they promise a highly responsive operation ropea buzzer an accelerometer that would require quite a lot of power to be constantly harvested from the environment without any special transmitter or RFID Gen2 style portal.
A nice harvesting example can be found at Linear s DN483 appnote Two 12 24 copper panels are placed 6 from a 2 4 fluorescent light fixture. resulting in a 200uW 6 inches. Now if you had an antenna the size of a quarter that could vastly outmatch the performance of DN483 setupcapable of harvesting enough constant power remember no battery supercap claim to actually poll the BLE RX at a decent rate AND transmit at 60m not just leave it in idle along with the operation of a loud buzzer and accelerometer without any distance restriction from a transmitter the only restriction would be for it to be anywhere in a urban environment.
basically the holy grail of RFID Would you -Sell it to the highest bidder at probably several hundred million usd. This is THE holy grail in active tag business -Start a Kickstarter initially asking for 25K and sell it at cost. What you are threatening is their 80,000 so far nest egg on Kickstarter. It s now 100k but hey, that s chump change when taking to market a new product, trust me, I ve done it many times before.
Their project is plausible, as I have said, can be made from parts from Farnell, reasonably priced and there seems to be no cloak and dagger. Their unwillingness to tell the world how it works isn t a sign that it doesn t. It s commercially sensible to keep quiet especially if there are patents pending I know they may have filed applications but they don t want a h t storm of objections and challenges. Why not throw down 14 or whatever and get in line for a product, you will then be a customer and may get some response when asking about the project.
Don t expect too much though, you can buy any high-street electronics but its unlikely the manufacturer will let you have a schematic or maths. Again, just my 2c or 0. 015 over here. Steve, You say it is plausible, but the majority of posters here appear to disagree. If these tags are plausible, wouldn t it also be plausible to create a batteryless bluetooth mouse using the same technology and at about the same price. That would obsolete almost all wireless mice currently in use, and make the inventor very wealthy I would imagine.
Yes, Technight, it would be possible on a larger scale for mice and yes, I do think its plausible no matter what the masses say, I am fairly technical and can make my own mind up based on experience and research. I have designed a number of BT not BT LE I might add mice and the pwr consumption is much higher than this tag check out Agilent ADNS. for mouse sensors, many mA required the optical sensor is the dominant consumer of power.
A mouse has much more space inside due to it being for a hand to clasp, much more space to employ a more sensible harvesting technique such as movement ie moving magnet or thermal etc. Actually, if it did employ EM harvesting, it could do quite well being located typically so close to electrical equipment. Problem is, as a consumer, would you rather pay 20 for a wireless mouse which takes 2x AA batteries and lasts a year until you change them or 50 for a mouse which has no batteries.
Do bear in mind that the imaginary 30 differential buys 10 years worth of AA batteries. These are the types of things a business will consider before over-engineering a product. At the end of the day, the usage scenario for a mouse means its not as much of a pain to change the batteries when was the last time you lost your mouse as it is for something like a locating tag. For a tag you don t want to have to remember to change the batts, you just need to rely on being able to find it.
Mind you, if you had to check and replace the batteries on a tag you might not lose whatever it s attached to so much. Steve, I am not sure where you come up with the 50 figure for a mouse using this technology. An iFind if viable is 14. A wired mouse can easily be gotten for 6. Throw in 5 for misc additional costs, which is more than generous and we are talking 25. I think you would find a lot of people willing to buy a 25 wireless mouse that will never need a battery.
Also, it s unlikely to make the inventor there s lots of prior art, check the web wealthy, the bom cost would present a cost barrier for the consumer vs traditional primary cell equivalents. For the consumer there is no financial incentive to buy one. There is, potentially, a green environmental benefit but not a financial one.
money in your pocket is what matters to what we would call the masses. To be honest, I would like this technology to prove viable, as it would serve as a gateway for all kinds of new batteryless gadgets, but the realist skeptic in me is far from convinced that it can work. Time will tell, as the iFinds are supposed to ship in October. I see what you re saying. 50 seems to be a reasonable cost for a half decent BT mouse my last one cost a lot more. Whether its a iq option ou opções binarias or tag, the EM ambience is outside of your control, it s much easier to power a tag at.
uW vs a mouse at when I was making them 140mW. I think a mouse may be able to be charged via EM harvesting not operated but, given the extra space in a mouse, it s more suited to a more traditional energy harvesting techniques. or primary cells. Mice aside, I think a BTLE module is rechargeable via EM although operating from EM is another very different and challenging story. They claim no battery but I suspect there is one or a bank of ceramic caps. Would you be interested in sharing the details of that email exchange with the drop-kicker.
I love this line We are negotiating with several large companies for the technology.so they do not have the technology themselves. or the right to use it in a product that they are selling. sounds totally legitimate to me. Price negotiations and licensing legalities can take a while and it s not something you want to take lightly. If taking a high ish volume product to market you should know this. Sounds like they are doing things right. Never miss a hack. If you missed it. The O-Bahn Busway Obscure Transit For The Masses.
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27.02.2020 : 03:50 Dougore:
In this context, the most seri ousthreat to the United States would be the collapse of the Musharraf gov ernmentand the Pakistani military at the hands of radical Islamists. would be under direct nuclear threat from a nuclear-armedal-Qaeda regime--one that iq option ou opções binarias have tremendous control over many other Muslimcountries. Asia might well be, ripe for rivalry --including nuclear rivalry if the United States were to stopserving as guarantor of the current order.
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Use directives byte ptrword ptr and etc. 08 July 19, 2020 Now the program can automatically replace assembler instructions with your assembler code.
29.02.2020 : 08:19 Vudozahn:
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