Radar to detect mosquitoes? - Page 1
Forum section: electronics / projects

author: PartialDischarge
author_rank: Super Contributor
timestamp: July 30, 2020, 08:19:46 am
content: Hypothetically speaking, what kind of radar (frequency, size, antenna type...) would work in detecting and tracking a mosquito flying in a medium sized room (5x5m for example).Mosquitoes do not fly fast but are tiny, yet bats detect them with ultrasounds (100-300kHz). I wonder if ultrasounds would work or some GHz radar would be needed to detect and track its position.To avoid mechanical movements I guess an active phased array would be most suited for this application.Again this is just a hypothetical discussion of possible approaches to detect and track the position of such unwelcome creatures.

author: OM222O
author_rank: Frequent Contributor
timestamp: July 30, 2020, 08:33:56 am
content: if you want to use radar to detect them, you need them to be at minimum half the wavelenght but that doesn't produce very reliable detection method. Ideally they're one full wavelenght. I'm too lazy to calculate but that seems way too high to be actually doable (for a cheap DIY method that is, ofc you can build a whole radio tower for the application if you're rich).For the ultrasonic idea: won't work. I'm not sure how bats do it but if you have ever used an ultrasonic sensor, you'd know how inaccurate their beams are.

author: magic
author_rank: Super Contributor
timestamp: July 30, 2020, 08:38:18 am
content: No radar expert here, but the speed of light is about million times higher than the speed of sound in the air, so you will need a million times higher frequency to achieve the same wavelength and, presumably, resolution.

author: Berni
author_rank: Super Contributor
timestamp: July 30, 2020, 10:16:48 am
content: As others said you need the wavelength to be about as small as what you are trying to see. So about 100GHz gives you 3mm wavelength and an antenna that is about half that size.Good luck building that.

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: July 30, 2020, 11:02:25 am
content: The simplest and lowest cost is to mimic the way humans trying to sleep in a tent detect them. Have an array of three or more sensitive microphones detect the buzzing of their flight and triangulate with some audio frequency DSP.

author: RoGeorge
author_rank: Super Contributor
timestamp: July 30, 2020, 11:10:21 am
content: Meanwhile, 10 years ago

author: Domagoj T
author_rank: Frequent Contributor
timestamp: July 30, 2020, 11:11:12 am
content: Quote from: Berni on July 30, 2020, 10:16:48 amJust go a few orders of magnitude faster and get an off the shelf solution - a camera.edit:30 seconds too late.

author: vk6zgo
author_rank: Super Contributor
timestamp: July 30, 2020, 11:11:43 am
content: Quote from: Berni on July 30, 2020, 10:16:48 amHams make contacts of multiple kilometres on 122 GHz.

author: PartialDischarge
author_rank: Super Contributor
timestamp: July 30, 2020, 11:15:02 am
content: Quote from: RoGeorge on July 30, 2020, 11:10:21 amGood system, although I don't think it has been developed. However the idea of using a light mesh is also valid to detect 'intruders'

author: PartialDischarge
author_rank: Super Contributor
timestamp: July 30, 2020, 11:21:15 am
content: Quote from: vk6zgo on July 30, 2020, 11:11:43 am"The current world distance record on the 2.5 mm band was 132 kilometres (82 mi) set by Austrian stations OE5VRL and OE3WOG on October 19, 2013"Wow

author: RoGeorge
author_rank: Super Contributor
timestamp: July 30, 2020, 12:04:08 pm
content: Quote from: MasterTech on July 30, 2020, 11:15:02 amI think it was developed already, but for some reason it was not practical. I remember seeing a video (not sure if it was from the same company) where in a window frame there was a setup with some mosquito detector (again, don't recall if it was radar or video detection), then burning down the mosquito with an automatically aimed LASER.However, since 10 years later we still don't have this, might seem it was not very reliable, or maybe it was too expensive when compared with chemical solutions.Another anti mosquito method I remember was to release a huge number of sterile male mosquitoes in the wild, male mosquitoes that were sterilized by a lab (sterile as in not been able to impregnate the mosquitoes females, therefore not being able to reproduce). The sterilized mosquitoes were supposed to compete with the fertile male mosquitoes already existing in the wild (and they did compete), therefore the total number of mosquitoes offspring will drop. And they did. It's a method already practiced in some places of the world, AFAIK.

author: Berni
author_rank: Super Contributor
timestamp: July 30, 2020, 12:38:34 pm
content: Another way to stop them from getting trough a window is to simply put a bug mesh over the window. Cheap, simple, reliable.

author: mrflibble
author_rank: Super Contributor
timestamp: July 30, 2020, 01:08:59 pm
content: Quote from: Berni on July 30, 2020, 12:38:34 pmOr just nuke the site from orbit. It's the only way to be sure.And on the off chance that your nuclear stockpile is running a little low, like RoGeorge I also recall an older system using cameras for detection and lasers to zap those pesky mosquitoes out of the air.https://youtu.be/fH_x3kpG8Z4?t=30

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: July 30, 2020, 01:41:04 pm
content: Sticking to monostatic radar, you'd be limited more by antenna directivity than the fact that they're smaller than the wavelength; weather radar operating at 2.8 GHz can easily detect insects up to about 10 km. Rayleigh scattering allows you to detect particles much smaller than lambda.https://www.radartutorial.eu/01.basics/Rayleigh-%20versus%20Mie-Scattering.en.htmlHowever, to get a reasonable angular resolution (let's say, 10 degrees), one would need a ~1 meter diameter aperture - not exactly practical. Going to 60 GHz, you would only need a 5 cm aperture (at which point the approximations I used for beamwidth would likely fall apart). By sampling at a higher resolution than the beamwidth, one could fit a gaussian and get a better estimate of the target position in azimuth.60 GHz parts are getting affordable, but phased arrays at those bands are still Bell-labs type stuff; I think they were able to demonstrate a TX array at 94 GHz a couple of years ago. You can buy a 28 GHz dev kit with 256 elements from Anokiwave/Ball Aerospace.Finally, the really hard part would be figuring out how to reject multipath from the walls, roof, furniture, etc. Depending on mosquito density, living inside an anechoic chamber may not be too much of a compromise

author: atmfjstc
author_rank: Regular Contributor
timestamp: July 30, 2020, 02:45:33 pm
content: Seems to me more practical to detect them by triangulating their "regular" (i.e. non-ultrasonic) sound emissions.Just imagine the satisfaction of trying to go to sleep in your room and hearing:"buzzzzzzzzzzz.... KKERZAAP!! *dead silence*"

author: phil from seattle
author_rank: Super Contributor
timestamp: July 30, 2020, 03:44:46 pm
content: Quote from: RoGeorge on July 30, 2020, 11:10:21 amYeah, that was Nathan Myrvold's "SDI for mosquitos". Complete blather. Especially since the intent was to protect people in the malarial zones - people that can barely afford running water. This was from the same outfit that wanted to solve global warming by lofting some sort of dust into near-space and reduce hurricane season with evaporative coolers in the Gulf of Mexico. All thought, no action and zero consideration for unintended consequences. Though, they did file a few patent claims.And while we are at it, the company should have been named Intellectual Vultures, not Intellectual Ventures. But that is the subject of a different rant.

author: janoc
author_rank: Super Contributor
timestamp: July 30, 2020, 04:04:43 pm
content: Quote from: Domagoj T on July 30, 2020, 11:11:12 amGiven the size of a mosquito and the speed with which it moves, that would have to be one heck of a camera to be able to pick them up, especially at a distance of a few meters.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 30, 2020, 04:36:43 pm
content: Quote from: atmfjstc on July 30, 2020, 02:45:33 pmYep, that's likely to be much easier to implement. Whereas it could be relatively straightforward (with an array of sufficiently sensitive microphones) with just ONE mosquito, being able to track down several mosquitoes in the same area this way would get rather hairy. I guess you could resort to some kind of ICA, but if you add various ambient noises on top of that, not sure how accurate that could be. Now the OP kind of talked about one mosquito, so if there is only one in the room, that could be doable.Forget about video IMO. Not only do they fly too fast, but you'd need an array of cameras to cover the whole space, with proper focusing so that you could at least identify the location in real time (for very tiny beasts, you'd need a rather good focus). Yeah.Short of doing some research about how mosquitoes fly, I'm not sure I see the point though. What are you going to gain knowing exactly where a given mosquito is in a room in real time?

author: magic
author_rank: Super Contributor
timestamp: July 30, 2020, 05:07:21 pm
content: Quote from: phil from seattle on July 30, 2020, 03:44:46 pmThe malaria thing was to gain press coverage and it worked because you are talking about it.The patent thing was to earn money if somebody tries to actually build it and sell in the West.Never take anything coming from America at face value

author: duak
author_rank: Super Contributor
timestamp: July 31, 2020, 03:05:47 am
content: Since doppler radar detects masses of things that are individually smaller than the wavelength as well as detecting things that are moving, I googled "doppler lidar insect detection" and got quite a few hits. Here's one:https://cosmosmagazine.com/uncategorized/mosquitoes-are-really-on-the-radar/They were able to detect and count insects and classify them based on their wing beat rate. I'd expect the wavelength of illuminating source to be somewhere in the range of near IR (> 1000 nm) to near UV (>350 nm), basically the visible light spectrum plus a bit.I see that most of the papers are from the past ten years or so and are of academic interest, so I would expect development of the techniques are still being worked out. I'd expect that as soon as someone with money needs to track individuals, someone will work out the optics, sensors and the DSP to do it.

author: ahbushnell
author_rank: Frequent Contributor
timestamp: July 31, 2020, 03:37:53 am
content: Quote from: MasterTech on July 30, 2020, 10:36:44 amTouchy today.

author: PartialDischarge
author_rank: Super Contributor
timestamp: July 31, 2020, 04:34:15 am
content: Quote from: duak on July 31, 2020, 03:05:47 amPretty interesting

author: phil from seattle
author_rank: Super Contributor
timestamp: July 31, 2020, 04:50:00 am
content: Quote from: magic on July 30, 2020, 05:07:21 pmNo, they really thought they would be conquering malaria. I know several people involved. And the patents, maybe.But on your last point, I've edited it to make it more realistic: Never take anythingcoming from Americaat facevalue

author: elektrolitr
author_rank: Contributor
timestamp: July 31, 2020, 07:21:30 am
content: Hawk-Eye system used in tennis etc is said to be accurate to <4mm and is using only high-speed cameras and image processing. I think that tracking a tennis ball in a court is the same order of difficulty as tracking a mosquito in a regular size room.The key difference would be that a ball has already a contrasting color. But, if one can't paint mosquitos, there is always option to paint the room!

author: MosherIV
author_rank: Super Contributor
timestamp: July 31, 2020, 07:39:59 am
content: Triangulating sound method works for a single target.I doubt it would work if there are a number of mosquitoes in the room.

author: PartialDischarge
author_rank: Super Contributor
timestamp: July 31, 2020, 08:10:39 am
content: Quote from: elektrolitr on July 31, 2020, 07:21:30 amBesides the yellow color of a tennis ball and its 20-30 bigger size, the main problem I see is that tennis matches are played in sunlight and mosquitoes do their work at night.

author: magic
author_rank: Super Contributor
timestamp: July 31, 2020, 08:14:13 am
content: Quote from: phil from seattle on July 31, 2020, 04:50:00 amEh, fair enoughMaybe it was the plan before the budget blew up or maybe the people you knew (engineers?) had different concept than the for profit company that hired them.It's Myhrvold by the way and some Microsoft coworkers described him as an eternal megalomaniac, so who knows, perhaps these guys were serious. It seems like every other company wants to change the world these days, simply making money doesn't cut it anymore.Besides, from the description, I think IV's modus operandi is roughly "patent a PoC of just about anything conceivable" and license it when / if ever the technology becomes economically viable. So who cares that nobody can afford it, meh.

author: Siwastaja
author_rank: Super Contributor
timestamp: July 31, 2020, 09:07:03 am
content: Quote from: MosherIV on July 31, 2020, 07:39:59 amFFT it before triangulating, I'm sure mosquittoes are buzzing at fairly slowly drifting frequency (which you can lock into and track despite the drift), and each have a different frequency. This is the feeling I have trying to sleep despite mosquittoes: different pitch everywhere, can track every moment quite accurately with the human auditory system. Obviously this only works with fairly limited number of mosquittoes and requires a bit of luck so that they don't happen to fall within too close frequencies to begin with, but I would guesstimate this could work quite well up to maybe 5-10 simultaneous mosquittoes.In any case, the range of such system would be limited (square law of amplitude), so you would use a distributed approach and use multiple such systems independently covering different areas. They could share information whenever a mosquitto is getting near to the end of the range of one system.As a side note, before starting to automagically kill insects, make sure they are not the pollinating kind. For example, UV light attracts insects that are genetically programmed to go for flowers (with their UV signals), these insects are extremely important for the ecosystem and fairly beningn. The bad guys you want to get rid off are those who come for your blood, and these detect CO2, body temperature, and so on.If all this sounds too easy, here's a true engineering challenge: before zapping the mosquitto with laser, figure out how to remotely test the flying mosquitto for malaria, and only zap it if positive.

author: nfmax
author_rank: Super Contributor
timestamp: July 31, 2020, 09:38:41 am
content: Quote from: janoc on July 30, 2020, 04:04:43 pmSwallows manage it though (Yay swallows!)

author: janoc
author_rank: Super Contributor
timestamp: July 31, 2020, 03:07:12 pm
content: Quote from: elektrolitr on July 31, 2020, 07:21:30 amUmmm, not at all. First, the Hawk-Eye uses 6 to 10 cameras for the tracking. High-speed, high resolution expensive cameras tracking a ball of a contrasting color against the uniform color of the court in an extremely well lit environment. Also the fact that the ball is round and uniformly colored simplifies its detection immensely. Conditions about as good as it gets.Compare that with tracking an essentially black mosquito against non-uniform and uncontrolled background, in a poorly lit room (so you have a lot of image noise). From my experience with optical tracking systems (both using and building them), I can guarantee you, that you wouldn't be able to reliably track a fly (10x larger target than a mosquito) optically even against white walls in a well lit room from a distance of few meters using common machine vision hardware. The bug would be the size of one or two pixels and lost in the noise.If you don't believe me, take your photographic camera or smartphone (which likely has a much better lens and resolution than machine vision cameras do) and try to photograph a fly or a mosquito on a wall from several meters (without zoom, obviously). And see how big the critter will be in the resulting image, if it will be visible at all. For any sort of reliable detection you need the resulting "blob" of color to be at least (ballpark figure) 10-20 pixels across, likely more because the image will be averaged/filtered during the processing and very fine details get lost.And now imagine you are doing this at perhaps 1/4 resolution because machine vision cameras rarely exceed 2000px per line. Both because of costs and also because the gear required to process such enormous images in real time (unlike taking a static photo) would be extremely non-trivial. The high resolution (e.g. 15 megapixel and more) cameras also tend to have a slow framerate, making them unsuitable for motion tracking.

author: Marco
author_rank: Super Contributor
timestamp: July 31, 2020, 03:52:52 pm
content: The idea is to identify it in a narrow corridor between an emitter and a retroreflector, plenty of contrast.

author: _joost_
author_rank: Contributor
timestamp: July 31, 2020, 04:04:16 pm
content: Bats detect insects with sound waves they emit bouncing back. Frequencies with a wavelength larger than the insect do not bounce back but rather curve around the insect. Rather then emitting a single frequency bats send out a chirp which allows them to estimate the size of the insect by the frequencies and strength of each bouncing back. Different bat species have different chirp frequency ranges.To compute the frequency needed to detect a 5mm insect, this is computed with: f = v/lambda with lambda being the wavelength and v the propagation speed which is the velocity of sound in this case. So for lambda being 5mm this comes down to: f = 330m/s / 5.10^-4 = 660kHz. This is the lowest frequency needed to detect a 5mm insect, higher is fine also.To be able to place an insect at a specific location, you need at least 2 detectors (ears) so that a phase correlation can be made between the sounds received. For practical application, the spacial distance between the receivers, the transmitter and where the insect is all need consideration and optimization. E.g., an insect on a line/cone somewhat in the middle between the two receivers will be easier to detect than way off to one of the sides. Additionally detectors/emitters may be needed or some sort of apparatus that lets the emit/detect contraction scan the room (like a radar).The problem you will encounter with this type of detection is that your ultra sounding receivers and emitter need to be extremely (phase) accurate. The cheapo distance type thingies you often see in Arduino like kits aren't going to work for you. Small phase offsets quickly lead to large distance/angle estimations. So your ultra sonics are going to cost you a pretty penny.So why not a camera as some folks suggested? Simple compute the phase angle you'd need for a 5mm insect at distance x and determine the pixel resolution you need (I'd leave it to you to compute).In case you wonder; I developed an ultrasonic detection method for pipe vibrations for industrial applications. Not quite the same as your insect problem but has similar aspects to it. I was able to detect (very) small vibration levels (orders of magnitude smaller than 5mm) at considerable distance from the pipe.

author: PartialDischarge
author_rank: Super Contributor
timestamp: July 31, 2020, 04:25:17 pm
content: Quote from: _joost_ on July 31, 2020, 04:04:16 pmSo in part you're implying that bats probably use higher frequencies that those usually reported in studies I've seen(100-300k). Some birds are just incredible in how specialized they are:-Bats (although bats are mammals) in detecting flies and mosquitoes-Eagles can spot small animals kilometers away-Owls are totally silent when flying-Woodpeckers can carve through wood by banging their heads against it, no trauma suffered.

author: max_torque
author_rank: Super Contributor
timestamp: July 31, 2020, 04:27:58 pm
content: I suspect that detecting mosquitoes is much like detecting submarines, in that it is far easier to just let them come to you, than try and find out where they actually are!The "convoy" system used to protect merchant shipping in WW2 worked because it attracted the subs to it, meaning they were easy to attack!So what you need is something mosquitoes are attracted too?

author: Berni
author_rank: Super Contributor
timestamp: July 31, 2020, 05:51:51 pm
content: Quote from: max_torque on July 31, 2020, 04:27:58 pmThis is actually how i deal with them.If im awake and hear that dreaded high pitched buzz i just stay still while keeping my hand near by and listening closely to try and track its location. Once i feel it land i wait for a fraction of a second for a bit of a false sense of safety before quickly swiping by with my hand. Tho its still not perfectly reliable, so it often takes more than one try to catch it.

author: bson
author_rank: Unknown
timestamp: July 31, 2020, 08:20:54 pm
content: Quote from: RoGeorge on July 30, 2020, 12:04:08 pmMy guess is the one in the video isn't aimed. Instead it's used at low power to detect an insect purely by breaking it, at which point it pulses it briefly, and once only, at high power. Something like this would be most useful where people can't get their hands or eyes in the beam.

author: LaserSteve
author_rank: Super Contributor
timestamp: August 02, 2020, 02:06:40 am
content: The laser zapping of mozziess thing comes up like clockwork a couple of times a year. Yes, you can use a zoom lens to find mozzies, tell from the wing beat rate if they are male or female, then run a co-linear beam of violet or near infrared light right back down the lens and blow the wings off. If your demo mozzie are in thick in an aquarium with a lightly colored background downrange.Here is where it falls apart. The lens field of view and eye safety.1. Thirty to sixty sets of lenses and galvanometerScanners per installation to cover a hemisphere.2. Even so called low power "eyesafe" lasers ( near to mid infrared) adsorbed by the cornea and not making it to the retina are still dangerous in this task. It takes x amount of millijoules to fry a wing off a fast moving skeeter and paradoxically an eye is still far easier to damage then the tiny body parts.Mother nature can make skeeters faster then the fastest galvos can target them. A friend makes the fastest and there is no way he can get them down to the targeted 20$ a pair.3. Skeeters can just fly over the "cone of no escape" and off to their next target. Required power goes up dramatically with range as the beam expands.4. Having a Nominal Ocular Hazard Range of 800 feet to tens of kilometers is a problem. After all, how do you have villagers running around yet have a system that meets the standard for laser safety of less then a one in a million possibility of eye damage per exposure?Yes . You could sweep a big beam around the sky and kill bugs, but it is horribly dangerous, horribly inefficient, and other methods are far cheaper.One system can protect a doorway as designed and published,, but is the low Pkill and eye hazard worth it?Well it can protect a doorway till you stand in it.Steve

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 02, 2020, 02:22:52 am
content: Perhaps the easiest way to kill the mosquitoes would be to fly a small drone at them and let the propellers slice them up.

author: RoGeorge
author_rank: Super Contributor
timestamp: August 02, 2020, 06:19:23 am
content: The most effective way to catch mosquitoes indoors, without chemicals and without walls smearing, is with a vacuum cleaner. The mosquitoes can't cope very well with strong wind, or air currents. There are some recent designs of quiet vacuum cleaners.Once you detect the mosquito, aim an air vortex to them, to push the mosquito near the window frame, then make the window frame as an air sucker, like a vacuum cleaner.

author: RoGeorge
author_rank: Super Contributor
timestamp: August 02, 2020, 07:15:21 am
content: Hitting them with a short but very strong puff of compressed air might work too (by dismantling their wings for example, but I never tried).Such a device will need to detect the insect, then to aim at it with an air nozzle, then to open a compressed air valve for just enough time, so a short "bullet" of compressed air to escape and hit the mosquito.

author: Mecanix
author_rank: Frequent Contributor
timestamp: August 03, 2020, 10:50:47 am
content: Reminds me of an old Ted Talk closing with the "Laser'in Mozzies" topic. A system (hack?) made out of old consumer electronics parts, apparently! Your guess is as good as mine as whether that is all true, or for a good show, you to judge!https://youtu.be/hqKafI7Amd8?t=883

author: phil from seattle
author_rank: Super Contributor
timestamp: August 03, 2020, 04:00:20 pm
content: It's my belief that most of these active approaches are doomed to fail. The higher tech they are, the more they are doomed. Frankly, DDT in small amounts is the most effective and cheapest way to go. While people will shudder over the suggestion, it's use would be orders of magnitude less than the widespread spraying that lead to it's banning. I recall seeing an analysis of such use and the claim is that it would not lead to the environmental damage that got it banned.On active approaches - the vacuum scheme works pretty well when teamed up with an attractant. You can buy (used to be able to?) a device that uses CO2 from burning propane as the attractant and a vacuum to pull them into a fine mesh bag where they desiccate and die. I don't know if the level of CO2 needed is too high for residences though we are all producing it and that's how the mosquitoes find us. I'm certain no insurers would cover a company making such a product though. hmmm, such devices are sold today - have no idea how effective they really are, though.

author: cdev
author_rank: Super Contributor
timestamp: August 03, 2020, 04:59:27 pm
content: I have some mosquito repellant spray thats made with a bunch of aromatic oils of plants. Its got a very strong lemon smell but it works really well. It repels ticks too. (it helps to also wear long pants and put rubber bands around the legs). Spray the repellant on that. It lasts all day long.

author: Marco
author_rank: Super Contributor
timestamp: August 03, 2020, 05:06:33 pm
content: Quote from: phil from seattle on August 03, 2020, 04:00:20 pmJust use the pyrethroids instead, works just as well outside of Africa and Asia and is actually legal.In Africa and Asia there's resistance, but there's resistance to DDT there too so that doesn't matter much.Developing resistance against lasers is a lot harder.

author: Berni
author_rank: Super Contributor
timestamp: August 04, 2020, 05:13:33 am
content: Quote from: cdev on August 03, 2020, 04:59:27 pmYep that lemon smelling mosquito replant spray does work well. Just make sure to hold your breath when spraying yourself with it. It has a really strong smell and breathing in the spray cloud practically makes you choke. But once its on the skin it doesn't really smell that much anymore and does keep them away for the night.Just because its a natural plant extract rather than a synthetic chemical doesn't suddenly make it harmless. There are plenty of natural substances found in animals or plants that will kill you even in tiny amounts. Tho don't think any of the popular bug replant sprays are any harm.Best solution is still a bug screen over the window so that they can't get in at all.

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 04, 2020, 12:24:33 pm
content: some chaps around here dont have few mosquitos in their house/room/lab and dont know what a malaria and dengue are. i hate mosquito bite (itch) thats why i have to live with prallethin and d-phenothrin. if i know vaccum cleaner is more effective i've already done that many years ago. if there is laser turret design to kill mosquitos or anything small that fly i'm all in.

author: cdev
author_rank: Super Contributor
timestamp: August 06, 2020, 01:49:46 pm
content: I have a device that contains a UV lamp and a strong fan. It sucks the mosquitos into an screened area where they cant escape and they just dry out and die.. Then later you empty the dead ones out. I also use a high voltage bug zapper. Between the two of them it covers me fairly well. Disadvantage is the areas where these two devices live has to be dark or their UV light attraction aspect does not work. So basically they both work best at night.

author: Jan Audio
author_rank: Frequent Contributor
timestamp: August 06, 2020, 02:17:06 pm
content: Ofcourse you need white paint else they hide.When can i order this ?, i need it.Are you saying bats use microwave ?Need to copy the bat maybe it works, the bat scans not a complete room.Is there a expensive better verion of the HC-SR04 inside a bat ?

author: DC1MC
author_rank: Super Contributor
timestamp: August 08, 2020, 08:33:25 pm
content: Your 60GHz radar is. (almost) ready:https://hardware.slashdot.org/story/20/08/08/0241202/researchers-build-a-low-power-radar-on-a-cmos-chipOf course, before tracking mosquitoes, it will track you, because this where all the reasarch seem do go nowadays, better tracking devices.Cheers,DC1MC