Iq option kontes
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Google Scholar SAGE Journals ISI Young, James, Cormier, Derek 2014Can Robots Be Managers, Too. This device communicates with Bluetooth Low Energy BLE enabled smartphones, has a 200ft 60m detection range and a loud alarm. What is interesting to mention is that this device doesn t need any battery to operate as it. 4mm tag meant to be attached to anything you may lose in your daily life. Vishak tipped us about the iFind Kickstarter campaign, a 1.
recycles electromagnetic energy and stores it in a unique power bank. However the antenna was quite big and very little power was extracted. 2uA 30uW in a normal home environment. Our very bad maths indicate that if one would like to extract power from a typical Wifi router located 2 meters from you emitting 0. 5Watts of power in a perfect vacuum environment with a 32 27mm 864mm 0. 000864 4 pi 2 2 8.
It is therefore too bad that we can t see in the presentation video what is inside the iFind, nor more details about the patent pending technologies involved. The closest thing that comes to our minds is the Allsee project, a simple gesture recognition device that uses existing wireless signals TV and RFID transmissions to extract any movement that occur in front of it. We hope that our dear readers will enlighten us in the comments section below. The word you are looking for is lose. 220 thoughts on Ask Hackaday Can Battery-Free Bluetooth Item Locating Tags Exist.
Anything you may LOSE. ninja edit thanks. 000864m tag you d only be able to get 0. I think I understand this enough to respond like so Yes, it s possible; no, I don t think the amount of power required is feasible. A quick Google search let us know that Bluetooth Low Energy solutions usually consume an idle current of around 10uA.
As you can guess, this particular claim intrigued the Hackaday team given that we never featured so small energy harvesting devices. Unless it also harnesses ambient sound for energy. Imagine never having to charge it up again, but only having to talk. The time is coming soon enough. The very successful Sticknfind campaign which promoted the same battery-enabled product claimed a one year autonomy with a CR2016 battery and a 100ft range, leading to a.
2uA idle current. As we re not expert on the subject, we would like to ask our readers if they ever came across such energy harvesting performances 3V 10. Wish I could be a part of it, but I don t have the time iq option kontes skills. Those guys managed to get 220uW from a fairly large antenna. Okay, so these tags have a much smaller antenna but they also have lower energy requirements.
The paper I linked shows running a clock thermometer that requires 25uA 1. Speaking of which, I m really excited to wait for the first voice-POWERED bluetooth headset. 5V with occasional peaks of 50uA. So 10uA is the idle current for BTLE, but does it need to be idle the whole time. Since they don t state how often they check if a tag is in range it might only pair once every five or 10 minutes.
It s interesting. Between those times it could be unpaired and completely powered down. RF EM harvesting is tough in the real world because of the environment various, EM field big different even in the same house, direction of wave and receiving antenna, limited antenna size and matching networks for wide-band, antenna gain and signal loss, etc.
The energy storage is another issue due to size and density. Some new technology may not available for use with extra thin, and may causing cost too high. I m following the energy harvesting technology for a while, but not real EM RF harvesting products in the real world for powering RF transceiver, especially for consumer. Current Cymbet CC3150 is 50uAH at 3V, it can t power BLE for half day if you set BLE adverting to 1000mS. The lowest power BLE chip in the world should be Dialog, which avg sleeping current is about 1.
9uA at 1000mS sleep interval. The TX RX averaging over this period about 2uA, then you can calculate without any extra leakage and power consumption. So, I m very interesting for iFind solution which can be used everywhere. Hope to share more from you all. Voice powered should be doable. Voice powered phone systems are still used as emergency comm systems on military ships. In the early days of telephone systems some quite long runs were done with voice power, then powered repeater amplifiers were added.
Need lot of things to learn. Eventually centralized phone system power obsoleted the old tech. If you have an ordinary old phone that draws all its operating power from the phone line, you can still have phone service for a while after a power outage. Telcos have large battery banks to keep their systems running for several hours. If you have a cordless phone or a phone that does anything that requires it to also be plugged into a power outlet, it ll be useless in a power outage.
So if you re a prepper and have kept your landline phone service, you d best get yourself an old school phone. Because the aliens are comin I tell iq option kontes. stores it in a unique power bank Report comment. if i entered a meeting with an investor and dropped that line without further explanation on exactly how it works i would have been escorted out, don t even let me start with an employer Report comment.
That s the thing, you re neither to them. But LG would demo it in the store for you wouldn t it. Give, for instance, LG a call and ask them for detailed info on how their LCD screens are manufactured, let us know what they say ;- Tell them your thinking of pre-ordering their latest model but don t believe it works, ask them for a schematic and a detailed report on how they wish to acheive 4k in a 1mm panel let us know how it pans out.
com help guidelines are very clear about No product simulations. It s the dragon in my garage problem. Now LG would gladly and are required to give the customers the power requirements of their TVs Apple will also gladly specify the charger requirements for their products, or back in the day sony wouldn t hide how many AA were needed for a walkman Likewise is no big deal to ask for the Electromanetic Irradiance W m 2 or any apropriate radiometry units needed to power such a device indefinitely so that customers can check if this is realistic with their intended operating environment wouldn t you agree stevetyson2014.
As for power requirements, I agree there too, yes they are obliged to publish these but they are generally quite useless when trying to reverse engineer a product or prove its viability. As soon as they provide credible evidence I will personally get in line and endorse as well as help spread the word in favor but for now the evidence just isn t there. The thread is about whether it can work and howI believe it can, but, only under certain conditions.
They give very little insight into what lies beneath. Their description seems to state it will work ad infinitum which is a little less believable. W m 2 would be useful, not sure how many customers would be able to measure this though. Just to be clear, I haven t found anything to totally dismiss their claims but, like you, would love to see a demo. If their claims are true then it could be a very long demo.
I hate to be that guybut I m with you on this one either they re sitting on something faaar bigger or there are some magical unicorn farts in the mix. It will be interesting to see how this pans out. They don t need unicorns, they figured out zero-point energy. It s like a unicorn but less fun to pet. Although if we do have unlimited energy and the first use was to find a remote I m hopping on the first super-shuttle off this galaxy.
The unique power bank sounds like some sort of super capacitor. super caps are far too large at this point to do anything like this. Not really, they come in all sizes these days. but not in the size required to fit in a package that small while having the necessary current capacity. Don t they iq option kontes quite some leakage current as well. I think the supercap capacities of graphene can be laid flat in a very small space with a huge capacity.
I could envision radio waves, which are energy always available in the air ,being harvested as a voltage and stored in a supercap. There are supercaps that could do this and with very low leakage current ie 1 μA loss 120 hours. However putting them plus everything else on a device selling for 16 is challenging. Either way they will be using a boost converter so the rechargeable battery tech is a moot point. Supercaps and to a lesser extent LiPols are considered leakybut the leakage is proportional to capacity internal surface area, more directly.
This would most likely be using ambient RF harvesting of some kind Google WISPeither assuming some signal of opportunity HDTV, Wifi or with the Tx device spamming the air with packets, and the tag responding every 1000th packet or so whenever it has saved up enough juice for a single response packet. The internal power source would only need some mJ of energy, enough to cover one Tx packet and overcome any quiescent usage self-discharge for the power-saving duration between replies.
Extraordinary claims require extraordinary evidence. I think it s the claims which are vague yes, it may never need a battery replacement but that must only apply to their idea of normal operating conditions which aren t stated. Yes, it could harvest enough power to do stuff a certain number of times per insert time frame here. Without normal operating conditions or some, published, assumed usage scenario then it could appear to be a perpetual motion machine and we all know about those, right.
Maybe it has its own flux capacitor. Most likely this. Or one of several forms of thin-film battery Cymbet, whoever liquidated InfinitePowerSolutions, etc.tiny LiPol or tiny polyacene cell would do the job. Replying just to say I m using uses quantum top hats to explain unrealistic technology to people now. A 16 ghz ten core processor that uses less than 5 watts of power, and will do your laundry for you.
How did they make that work. Uses quantum top hats, obviously. hahaha i made it up on the spot im glad you like it XD. Yeah that was a badass joke quantum top hats. Really like it too p. The discrediting kickstarter thing is getting a bit tedious. We know it s a cheap way of getting incoming links and page views for hackaday but there IS NO HACK ELEMENT.
Come on guys, get it sorted. Even without the hack element I find it quite interesting to see the method they use to try to prove disprove a concept. Ok, I agree, LG would be able to demo unless you pre-ordered an item which wasn t yet ready for release like pre-ordering a new ipad version. My money is on a small, rechargeable coin cell or LiPo cell. This energy harvesting topic seems quite interesting, actually. And I m sure a lot of hacking goes into designing something like that if it actually works.
Either way, it s something to think about but if you rather yawn, well. There are government imposed limits on the elecomagnetic field strength that the population should be exposed to, to avoid frying their brains and other more subtle problems. The limit is something like 1 mW square cm so, just maybe, it s possible to get enough power in populated areas lots of transmitters of all types.
The problem would be efficiently capturing the energy. If you attached a few tv antennas, a couple of fm antennas, a long wire and ground system plus a microwave dish or two it should work fine. In general, receiving antennas aren t very efficient. B-but muh circlejerk. Speaking as someone just cutting their teeth in the hardware world, it s actually a bit interesting to hear experienced electronics experts discuss How they might go about making this technology work, or why they think it s totally impossible.
You re right, however, that there is no hack here. And this isn t StarterBustersADay. Maybe this sort of content is best left for the forum. Ha, totally tried that fake website. I very much enjoy the technical discussions these bring up, the term Hack is so mislabeled these days anyways. MAKE is more appropriate these days. As long as they churn out 1 Hack Day I feel I m getting more than I deserve.
Yeah hack is an antiquated term. I didn t know we could count on that loophole Good lookin out. There most certainly IS a hack element. They re potentially exposing HACKS here. 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 iq option kontes 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 these. 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 tag 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.
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