ฝัง
- เผยแพร่เมื่อ 5 พ.ค. 2017
- The invention of radar influenced the way World War two went because it was possible to detect planes of the enemy and shoot them down. And since then, this technology made civil aviation as we know it possible because it can detect the movement of metallic surfaces over distance. Of course, technology can also be used against us, for example, if we are trapped while speeding…
Links:
HW-MS03: bit.ly/2qffo0R
RCWL-0516 (Works also with 3.3 volts): www.aliexpress.com/item/RCWL-...
WB3-12: www.aliexpress.com/item/LED-M...
XYC-WB-D1: www.aliexpress.com/item/Micro...
HFS-DC06: www.aliexpress.com/item/5-8GH...
220V Switch (SK-600): bit.ly/2oGt8Sc
www.rogerclark.net/investigati...
github.com/jdesbonnet/RCWL-0516/
Supporting Material and Blog Page: www.sensorsiot.org
Github: www.github.com/sensorsiot
If you want to support the channel and buy from Banggood use this link to start your shopping: bit.ly/2jAQEf4 (no additional charges for you)
/ sensorsiot
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As many commenters rightly found out, these devices are regenerative receivers. If you are interested in "real" radar sensors, I propose watching video #439
If these devices are regenerative RECEIVERS do they need a licence? After all, they do actually radiate! thanks
@@andrewainger I do not think a license would help here. They are anyway illegal...
Mystery gadgets! Nice writeup. You have a very comfortable voice and clear, easy to understand diction. Good job!
Thanks!
Ketil Duna , Really good diction, I'm from Russia and I understood all the information. Good work!
excellent comparison video, I can see allot of work went into making this.
Thanks!
Lucky for him that his neighbour works as a ground controller at the local airport, so he's an expert at flapping his arms around :-P
Thanks for checking out these various sensors. I think I will find them very useful and it is great to be able to rely on you to sort the features of the many choices available!
You are welcome!
Hi. I've recently discovered the RCWL-0516 and in search of more specifics I've then found your video.Your extensive tests are very helpful. Especially the needed voltage to run it, the diagnosis if the devices interfere with each other, the directionality and what they penetrate.
Viele Grüsse aus dem Hackerspace Ruum42 aus der Ostschweiz.
I keep repeating myself... great video !
A very good comparison which is very usefull. It will defenately help me
for choosing the right one.
Thanks Andreas !
You are welcome!
Sir your videos are gold, it reflects how much work you put into these masterpiece review videos.
Thank you!
Awesome! I have been waiting for this video since you mentioned it in one of your mail bags, thanks for coming through with the usual great content.
Thanks!
Andreas , Thank you for your articulate understanding of this technology.
You are welcome!
Today my RCWL-0516 's arrived from ali-express, could'nt wait to do some experiments .. (did'nt add any additional components)
Wow .. these things are unbelievable sensitive especially moving to or away from them. Over the entire distance of my buro (~4 Meter) a movement of 2 cm's of my hand is enough to trigger it.
Thanks a lot Andreas for making this great video!
You are right. Most of the time, I think, we have to reduce sensitivity rather than to try to increase it...
They are really too sensitive. I tried connecting one(rcwl-0516) to a nodered counter node via a 8266 microcontroller to detect the number of detections and found that even with nobody present in the apartment it is still detecting movement at times.I live in an apartment building so I assume it is detecting movement through the walls in the other apartments.I did not try to reduce the sensitivity yet. Has anybody tried it with resistors to reduce sensitivity?
I have been using RCWL-0516 Microwave Radar Sensors in a smart lighting application (integrated with ESP32 developer boards) for several months now. To this video I would add a couple notes. The first is that though the sensors do not interfere with each other, they can get false triggered from the ESP32. This effect falls off after a centimeter or two. Lesson learned, be careful mounting the sensors to the same circuit board as your controller. The lack of directionality and ability to penetrate wood is amazing and perfect for my application. The sensors often detect me just before I enter the rooms with my lights.
My sensors appear to work through regular glass. I mounted some of my smart lights on my double pane window and the detectors see me from outside my house. My different experience may be explained by the sensors penetrating the wood but it may be that I’m using traditional glass and your video reported testing against acrylic glass. The later makes sense as acrylic would act more like water than silicate.
A final note on voltages... Though it does take 5V to power the sensors, the sensor output voltage is 3.2-3.4V. This is perfect if you’re powering your circuit with a 5V supply and reading the signal with a CMOS device like the ESP32.
Thank you for your additions!
Will it be able to detect u if ur are not moving or sleeping
Excellent comparison Andreas. I will be using in my future projects.
Thanks!
Good video. I like how you compared these units and gave a clear overview of their main advantages. (Good to see I picked the right one when randomly ordering the cheapest radar-sensor I could find). Thanks!
You are welcome!
Perfect timing! I just received four RCWL-0516 units. I could not decide which variety to get and it appears randomness intervened to select a good choice for me.
These evaluations of similar products are both interesting and useful. Thank you!
You are welcome!
Excellent details. Thank you. It will be great if you can make a video on using those as metal detectors! Like detecting metal hidden underground or maybe behind a large lump of sand. Those treasure hunters will love the video :)
Thanks for the feedback. Maybe I will try it once...
Unless the ground is dry, wouldn't the moisture swamp the return signal?
Super Vergleich! :) Die Neugier auf die Module ist geweckt und alle wichtigen Fragen sind in einem Video beantwortet! Klasse Arbeit!
Danke!
You continue to read my mind and post the videos just when I need them. Thanks
:-)
thank you for your effort. this was interesting AND useful!
Thanks!
First of all, great video! These motion detection radars most likely works in doppler mode, which is sensitive to frequency close to its emitting frequency, which explains why 2 of the same model do not interfere with each other, and why they don't detect stationary object.
You are probably right. There are a few ideas around in the comments. I do not know what is right or wrong...
Very nicely done - appreciate your thoroughness on the testing; gave me some background on what they might do.
Thank you!
Excellent! Very professional and comprehensive. Saved me tons of work... and money! Thank you, Andreas. I'm looking forward to your next video.
Thank you for your feedback!
Cool stuff. I might buy a few to play with
:-)
Andreas,
The working principle of these type of radars (radio detection and ranging) is well understood and used in many applications already for many years.
In a nutshell:
These radars typically work in the L to X band : 1GHz-12.5GHz
They are frequency modulated continuous waves radars typically with linear frequency sweeps, say 100Mhz
Example: a saw tooth frequency of 100kHz changes the frequency linearly from 2.4GHz to 2.5GHz in 10 microseconds
The transmitted signal is sent into the world via the antenna
The received signal that bounced back from an object on a distance d from the antenna is received back with a delay of 2d/c seconds (c speed of light 3*10E8m/sec).
Example: if d is 3m, the delay is 20 nanoseconds. During this delay the frequency of the transmitter has increased 200kHz versus the received signal. (100MHz*20nsec/10usec)
The transmitted and received signal are combined (mixed) and passed through a highly nonlinear element, i.e a diode. The output of this process are waveforms that include the sum and difference of the 2 signals and their harmonics
Through proper filtering we can isolate the frequency difference (200kHz), calculate the delay (20 nsec) and the related object distance (3m)
Kind regards
Thanks for your explanations. I only doubt if or how all these functions can be done with only one active component. That is the miracle for me...
If you look at a newer video we use the principles you mentioned for a bicycle counter. But this device will have much more parts.
Dude - did you copy that out of a textbook? Nice explanation for doppler ranging radar. But that's not what this does. It just detects motion by mixing the transmitted and received signals together and detects a low-frequency beat. No ranging info. No speed info. Just detects motion.
That is not the principle how these work, though. They are simple regen style recievers
Thank you for your thorough analysis of the devices. A fine video presentation of your results.
You are welcome!
I discovered those modules recently, and still waiting for them to arrive. You saved me a lot of time, i don't have to make a comparative test. Thank you
You are welcome!
I don't usually like videos on request, but I had to make an exception.
Thanks for liking. I hope, I did not request it. I just know, that many people forget it..
With outstanding content like this, it's really a crime that AS doesn't have 200,000 subs. Soon, I trust!
Thanks for the nice words!
Are Jayem
He's speaking to a specialized group with this subject matter. He is very good at what he does, but there are not many who have an interest in sensors.
Besides the particular topic (sensors) - which is gaining traction with many makers and electronics diy hobbyists - I find a good number of our host's presentations balanced, informative and accessible, and creatively interesting. By doing this, what would be specialized subject is delivered for a wider audience to ponder and spark ideas.
Are Jayem
I definitely agree with you.
The long awaited radar sensor comparision you promised to do! You have not forgotten it! Now I know these devices work and which one to buy. Thank you so much!
You are welcome!
Great video as always. Thanks Andreas. Have a great Sunday!
Thanks. You too!
I bought a sensor which is marked "2.7GHz" from Aliexpress and was quite surprised by the spectrum of signal which it emits. It is not a narrow "spike" but rather wide, maybe 1 MHz wide. Is that happening because of poor Q of PCB resonator?
I do not know, because I was not able to see much spectrum below 3 GHz.
1 MHz isn't that bad for these type of devices.
with an arduino your frequency can vary as much as 0.5% - at 3 GHz that would be 1.5 MHz just from inaccuracy.
"of course the technology can also be used against us" LOL
:-)
Thorough review that answered all my questions.
Thank you!
A very comprehensive review! Thank you for your hard work!
You are welcome!
IRC these units don't work like a radar. IRC they don't receive a signal back from what they send out. They just emit a continuous wave and monitor how much power it is using to transmit. if something moves in it's "field" it changes the SWR standing wave ratio of the transmitter, causing it to us more or less power that the comparitor uses to cause a trip.
This is one additional opinion on how these devices work. I stopped to try to understand. I just use them...
Baaaa
I agree with Sirus. This is very similar to the way shop lifting alarms work.
Depending of the distance between the transmitter and the reflections the signal arrives at the receiver either in phase, out of phase or in betwee at the receiver. The two signals are present on the transistor at the same time. As the transistor is a nonlinear device the two signals mix together and generate a DC offset dependant of their relative phase. When an object is moving in front of the sensor this DC offset oscillates at a very low frequency. This signal is amplified and detected by a chip which is very similar to the BISS0001 used in PIR sensors as the output signals of these sensors are nearly identical. The only difference is that this chip includes a built in 3.3v regulator.
@@keesterwee4890 They do not work the same way as the shop theft systems. They rely on the same technology used with prox or access control tags. The arches transmit an rf signal that sweeps a small bandwidth at around the 3.8ghz mark. The tags on the shop item have an antenna tuned to that frequency, a small capacitor and transistor in a smc package connect to the antenna. The RF energy from the arches powers the IC in the alarm tag and creates a simple oscillation resulting in a reflection of RF power at a slightly offset frequency or delay depending on the system type. The signal return to the arch triggers the alarm.
It's just come over to the uk but stores in Japan have been using this for years with IC's that will return a pulsed code instead of just a "present" signal as with the theft alarms. These shops in Japan allow you to swipe your customer card and then go round the store filling your trolly. When you exit the store all the prox codes are read and you are billed for the goods. Sadly until all the packaging manufacturers and the industry incorporate smart IC technology we cannot switch to this system.
I tested a product with a smart tag a while back and was not surprised to discover that the coded return from the product matched the bar code ! I assume this has been done to make life easier for any stores that have a barcode database. They only then need switch from a barcode reader to an RF based one. I can't see unmanned stores taking of in the UK just the stock itself ;-)
With regards to how these little detectors do operate see my reply to "Sirus"
@Andreas, some new LiDAR models entered the market, you could test them maybe?
Any links?
This one is the original of the cheaper LiDARs on the market but currently sold out: www.3dxr.co.uk/product/benewake-tfmini
America: www.seeedstudio.com/Seeedstudio-Grove-TF-Mini-LiDAR-p-2996.html
America 2: www.robotshop.com/en/benewake-tfmini-micro-lidar-module-12-m.html
This one is a China knockoff but perhaps the same: www.aliexpress.com/item/RCmall-Lidar-Range-Finder-Sensor-Single-Point-Micro-Module-for-Arduino-Pixhawk-Cable-Benewake-TFmini-Drone/32852024277.html
High Quality LiDAR for reference (older) : www.robotshop.com/en/lidar-lite-3-laser-rangefinder.html
Thanks for your links. I will look into the matter.
Thanks Andreas, I always enjoy your videos.
You are welcome!
Top notch video. Practical, succinct, objective. A benchmark for review vids.
Thanks! :-)
Radar transistor, switch turns on to send signal for fix time period. Then it changes to receive signal must be another switch somewhere in your circuit. On receive the signal is passed through a range gate system. Plus filters first to get rid on high frequencies and only let audio frequencies through to range gates. Don't get me started on speed. One of many jobs I have had.
+Chris B You are right. But here, you only find one transistor. This is, what amazes me.
Most of the stuff for filters would be in the chip. I need to go to the shed to check the transistor system use in this circuit, Andreas. As I do remember there was a simplified, radar which used one transistor, but have not been doing radar 11 year not so a bit rusty.
+Chris B The chip seems to be a digital PIR sensor timing chip. No RF, no filters there.
No the chip would be audio processing if used for filtering range.
Worked it out the transistor is mixer and mode suppressor. Clock is generated by the chip which must pass it to a solid state drive unless it is in the chip. If you need to know more msn me mate.
Hello Andreas,
Before I begin, I like your videos a lot.
In your video at 15:04 min. you explain that the RCWL-0516 cannot work in a 3.3 volt environment, I make a mistake and put 3.3 volt as input voltage.
So 3.3 volt on the 3.3 pin and GND on the GND pin then a diode connected on the Out pin and GND, and wonder the RCWL-0516 works also, it detects movements like before.
I think that you can use the module from 3.3 volts and if you have 4 volts till 28 volts you must connect the input voltage on the VIN pin.
www.elecrow.com/rcwl-0516-microwave-radar-sensor-switch-module-body-induction-module-4-28v-100ma.html
Greetings from Holland,
Jan-Henk van Kesteren
Thanks for your link. Maybe there are different versions of the same modules around, as in many other cases. Or I did something wrong, which also happens from time to time.
Just found your channel.. Great work! I appreciate the comprehensive analysis of these cheap sensors, as the ebay listings tend to give little information.
Thank you!
Nice work. It was pleasure to watch. Many thanks.
Glad you enjoyed it
Are you sure the RCWL-0516 does not work on 3.3V? I really cannot see a reason why it shouldn't work if you power it with 3.3V on the 3.3V pin. Usually a voltage regulator doesn't care much if you power its output with the right voltage and no input connected... Even if the voltage regulator is integrated within the IC. And I don't think the unregulated input voltage is used anywhere else except on the voltage regulator input. You should try it.
You are right. I tried it again now and it works. I do not know what I did last time... BTW: I did not see a voltage regulator chip on board.
@Roter . If I understand you well, the 3.3V pin can also be used as an INPUT (on +3.3V) as long as the Vin pin is not used ... am I right ?
Yes
Thanks, then I'll try to power the radar sensor from the 3.3V output of my ESP8266 board.
Yann M I'd like to know how you get on.
Great video Andreas!
I found this GitHub repo that has a schematic of the RCWL-0516 : github.com/jdesbonnet/RCWL-0516/blob/master/README.md that you may find useful. Thank you for the great videos!
Thanks for your link!
I thought youtube didn't allow links in the comments?
This is very helpful video Andreas. Nicely done.
Thanks!
Very useful comparison video . Great effort is done .
Thank you!
The 1.8 GHz could be a DECT phone
Thanks for the hint. This is well possible because one was close by.
Great hands-on test ! Thanks !
More info here: github.com/jdesbonnet/RCWL-0516
Thanks for the link.
Thank you very much. Appreciated.
Great video. Appreciate the effort to examine and compare the most important characteristics of each unit with a scientific approach. I agree with you, even if the units are simply measuring the variance in transmitter output to determine motion, some sort of return circuit is required. Thanks again.
You are welcome!
this video was incredibly informative! Keep it up, man
Thanks!
Andreas Spiess, you are putting out very good content. Thank you! You are having an impact on the world.
Nice to read. Thank you!
Thank you for the video, Andreas! I love your channel!
I want to report that the RCWL-0516 works great with the Sonoff Basic switch with the OUT pin on the Sonoff's GPIO14 pin and the 3.3V pin connected to the 3.3V of the Sonoff. I use it to report movement via MQTT.
Thank you for your feedback. I am sure it will help other viewers!
thank you so much for doing this test its very important for many useful applications !
You are welcome!
Very interesting and complete comparison. Thank you!
Thanks!
Excellent video. I just bought some of these myself. Looking forward to testing them out when they arrive.
:-)
Thank you so much for doing this, prior to this video I was not aware of these cheap radar sensors (the rcwl-0516 is on eBay for about a dollar). As usual your testing was detailed and your explanation was perfect. Another excellent video!
Thank you for your nice words!
Nice video. Have not come across these modules yet. Very interesting, will have to add one to my collection.
:-)
Congratulations for your work. This type of videos are very useful when making a purchase decision.
Thank you!
Very good, thank you.
You have to bare in mind that a lot of double glazing windows have an aluminium coating all over the glass for thermal insulation/reflection, and so this will no doubt explain away a lot of the RF attenuation you found when doing the double glazing window through tests.
Maybe it has a coating. But I do not think so. It is more than 20 years old and back then, coating was quite expensive.
Thanks for this comprehensive and systematic comparision. It comes very handy to me because I also received a sensor similar to XYC-WB-D1 for playing around and looking for a helpful application. Unfortunately (?) most helpful application are already covered in my environment.
It is really an excellent work to do all that with just one (1) transistor and some passives. Chapeau!
That is what I think, too...
Video was very interesting to watch and the comments contained more interesting information, subscribed.
Welcome to the channel!
I very like your videos and how you do explain the comparison. You're now my favorite youtuber.
Thank you and welcome to the channel!
Thank you and your neighbour as well for this demonstration of these interesting devices ;-)
:-)
Thank you for this interesting video and excellent and very useful comparison!
You are welcome!
Thanks for all the hard-won information! Great study.
You are welcome!
Never heard of those fantastic little radar sensors. Thank you.
You are welcome!
Genial! Justo acabo de comprar el RCWL-0516 para detectar la presencia de intrusos, una muy buen explicación amigo! Gracias por compartirlo con nosotros
You are welcome!
Many thanks for the great summary - exactly what I needed to know :) Best regards from DE
You are welcome!
I must thank you for these videos, they are great.
You are welcome
Really good video. Clear and very informative. Thank you.
:-)
Wow, such a solid video - respect to You Andreas
:-)
Great Comparison! I'm anxious about the next video explaining how they work! Please do it :) Thanks a lot!!
I can not do a video about the working, because it seems to be a big mystery...
Andreas Spiess I'm sure you can! To me it's a big confusing theme, but you seems to be totally capable :)
Thanks for the work and presentation; much appreciated. HAd ordered one to test and wondered about the specs; now I know. :)
You are welcome!
Interesting video which gives a lot of useful information about these devices.
Glad you think so!
Fantastic video. you are as thorough as ever. thanks for your big use off time to make this video 👍😀
Thanks for your feedback!
Very nice comparison, Andreas!
Thanks!
I just found your channel, great video! I like how precise and concise your comments are. Brief, clear and to the point. You have a new subscriber!
And you made me laugh so much at the end when you said "If true then like". 🤣
Welcome aboard the channel!
Thank you so much for sharing this video, really informative.
You are welcome!
Excellent; exactly what I was looking for. Subscribed.
Welcome aboard!
Thank you, very helpful comparison.
Glad it was helpful!
Great comparison, thank you, merci vielmal Andreas!
You are welcome!
Thanks for your video. I need to use motion detection for my project. I appreciate your effort and infos.
You are welcome!
Fantastic review, full of useful information. I must get some of these to play with once I have finished refurbishing my bathroom.
Best wishes
Arthur
Maybe then I also have some more experience with them...
topic was new to me. very good video, very professional. good job
Thanks!
Why haven't I seen this channel before? Great videos. Subbed :)
Thanks!
Very imformative. Thank you for your efforts!
You are welcome!
Andreas, thanks for all of your excellent videos. I've learned a lot from you.
Could you do an update video on radar sensors? It seems like much should have changed in 4 years.
Nothing changed on these cheap sensors. The ones I have in mind for a new video are more expensive.
Nicely done - thank you for the effort.
You are welcome!
Thanks for taking the time to run through these. Wish I had found this video before I bought 5 of each of the RCWL and HFS boards. I need 3 working units (always buy extra from China). Looks like the cheaper boards will be the best fit. NBD. At the prices these things are going for these days I can throw the others in a drawer to use for something else some day. The HFS boards will be better if I need something to be directional.
I hope they will work for you. Keep the power lines very clean (there are a few discussions about that)
Excellent investigation , I'm planning to try out this sensor.
Good idea. They are very interesting...
Thank you for these awesome video presentations. Helped me allot understand the principles.
Thanks!
Thank you very much for this review!
You are welcome!
Excellent video.Thanks for sharing
You are welcome!
Another great video! Thanks a lot.
Glad you enjoyed it!
Thank you for the helpful video! I'm going to try the HFS-DC06 for directional sensing.
Enjoy!
I have the HFS-DC06 and I'm trying to get it working but no luck. I apply 5volt at vcc. LED goes on and goes out again. After a 5 seconds it goes on and stays on. No luck in getting it working. Any tips or tricks? Thanks in advanced.
Excellent review. This is how it's done people. Subscribed.
Welcome aboard the channel!
Great testing, enjoyed that ,thanks.
:-)
This was interesting AND useful! Thanks
Glad it was helpful!
Excellent video! Very informative.
To make RCWL-0516's output pulse shorter, one needs to replace the capacitor that is next to the pins 3 and 4 of the IC. I replaced it with 100pF capacitor and now the output pulse is around 40ms.
I think with larger values the ratio is closer to 0.25s/nF. Making the pulse longer can be done without removing the onboard capacitor.
But like you said, these adjustments require SMD work.
Thanks for the info. Maybe I will try it with one of the devices for my next experiments.
Awesome! Thank you so much for your work!
You are welcome!
Great video. Never new these existed. Would be interesting to see a video demonstrating when to use either radar, ir or microwave sensors.
Also, would be great to see what can be achieved with them, like can the device give a different reading dependent on proximity
You can do your tests. these devices are not expensive ;-)
I recently did a video about the new 24GHz sensors, BTW