Amazing $1 microwave RF motion sensor board review and test
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- Опубликовано: 8 июн 2017
- I stumbled across these while searching eBay for sensors for use with microcontrollers. A fascinating one transistor oscillator, transmitter and receiver to detect motion apparently using the Doppler effect. This video shows you how to set it up and to see how well it really works.
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Nice review and demo. I just ordered one, and can't wait to put it to use.
Thank you for sharing your knowledge and posting this video. Very nice info about the output current being regulated, allowing direct connection of LED or optocoupler. Also, great practical info about using a transistor to amplify the output. I noticed that the best antenna sensitivity is on the PCB side opposite to the components, just the way you used it in your experiment, although it does sense movements from 360 degrees.
Last year I saw these online, searched for a video, watched this one, and ordered 5 to play with. I have since purchased like 20 more of these plus the semi-directional and adjustable HFS-DC06. These go through interior walls fairly well but exterior walls with foil lined fiberglass insulation will bounce the signal back and detect mostly behind the sensor instead of the other side of the wall... works well at windows and wooden doors which are your common prowling/entry points for people up to no good if you're using these as part of an alarm or warning system like I am.
New subscriber here. Here's some data about this part I found on an eBay page that sold this board:
Adjustment Part Introduction: (These are three sets of pads on the back of the board.)
1.C-TM
Adjust repeat trigger time,default trigger time is 2s;increasing capacitor's capacity will make repeat trigger time longer;and actual counting trigger time can operate as below:
Stick capacitor on C-TM, test 9196 3-pin frequency F, repeat trigger time T=(1/f)*32768
2.R-GN
Detection distance adjustment; connect with resistor and detection distance will become shorter; if not connect, detection distance is 7m; if connect with 1M ohm resistor,detection distance is 5m
3.R-CDS
Internal VCC parallel connect with internal 1M ohm resistor to CDS pin (that is 196 9-pin) by R-CDS , CDS connects with photoresistor, you can close detection function at night
Pin Definition:
1. 3V3: 3.3 vdc power output
2. GND: ground
3. OUT: control output;when detect moving objects,it will output high level
4. VIN: input voltage,4-28V
5. CDS: enable control chip,lower than 0.7V,OUT will output low level all the time
Thanks for figuring out the pins for me. I appreciate that.
They work great, I have used these with the light sensor, and 4 esp32-cam's where the sensor triggered the led(flash) on the esp32's. I made a 4 direction trail camera that can connect to a field network and then be accessed via Raspberry pi running security camera software. The RPI was able to track 3 cameras at once, and it was picking up motion inside the house, through the walls. My next modification to the system will be to have the cameras save to micro-SD cards instead, but these have great range and sensitivity.
Thanks for the information on using these sensors
Received a few of these today. Really looking forward to testing them now. Hadn't thought about the aspect of going through various materials.
They are neat little boards. Some materials really cut down on the sensitivity.
The metal saw table would act as a ground plane or reflector, making the radiated pattern roughly hemispherical above that plane with a dead zone beneath it. Is the output simple high/low, or analog so sensitivity could be adjusted?
Great review. Very detailed
is there any way to adjust the range?
and if i mount it in a box with a metal plat in back will it only detect in the front and not the back
i want it for a porch light sensor i want to connect it to wemos d1 mini with ST anything
but don't want it detecting motion inside the house and too far off the porch to the sidewalk so i would like to be able to adjust the range but i see there is no POT on it i wonder if the input voltage effects the range?
Does this give an analog or digital signal as response. Wondering if you could raise and lower the sensitivity on the fly.
Good video. I have a bunch of these, few a little more sophisticated with variable sensitivity and timed output. I set one up to let me know when someone is downstairs by my door. The PIR as you said is no good going through class. These Microwave Sensors are great detecting metal and water, which of course we are mainly. They will detect through single skin brick walls and wood doors no problem. I have a couple similar to what you have, but I have not gotten around to figuring out the connections as yet. After watching this I do not have to. Cheers
Glad that this has helped. These boards have unpopulated solder pads to install components to customize the sensitivity and output timing. It would be nice to have control pots though. I've heard about these RF motion sensors used in LED bulbs but was a must buy when I found them on eBay.
is there any way to regulate it so it will react not on human but on a specific thing like a magnit or anything else?
I want to add a button buzzer speaker to it so we have audio as well as an LED.malibg it a good motion detector Not sure how to wire in a buzzer, any.help would be appreciated
will this sensor work when there are 2 objects moving from opposite directions???
Thanks for posting this! I consider your cat as adding to the test, not screwing it up. I'm ordering some of these and wondered how sensitive they are to animals. Also curious about plants outside moving with wind. I can put these inside my garages so they are not visible and protected from weather but detect people outside. Some spots have no plants but others do. I'll have to video my experimenting when I receive them and post the results.
I used this sensor but there is a great flaw in it that it is so sensitive that it detects any moving object like Fan or even insect roaming around in the room....is there any way to tackle this. Thanks
That's a really cool device!
this is simply a floating tank circuit, when something move the frequency resonance of the circuit change up/down and the circuit recognize a difference and trigger. the chip might be a simple comparator with some digital output. all the important emitting and base RF is all in the single transistor and resistor capacitor around the board.
I've got led light bulbs that appear to have this technology inside, very handy when you get home late at night, and the hallway light switch is nowhere near the front door!
It would be nice if it had a varying signal strength output, so as to use for something like a reversing sensor
Is there any possibility that the microwaves could be harmful, like a microwave oven for example?
nice board, I gotta get some!!!
Thank you for reviewing/breiflyCharacterizing this product for me!
I just got mine today. 2 of them and I haven't even tested them yet!
The CDS sensor just stops it from triggering on motion during daylight hours. Not sure if it's smart enough to go into a low power mode during daytime.
Great Project......
I have notice when move really slow it won't detect you. You need to move at a relatively fast pace to get detected.
I really liked the demo. Impressed by the circuit, seems everyone else is going Arduino.
A parts list and circuit diagram would help. Bit hard to read from the photos
How is this with false positives like a branch on a tree moving? I guess it is more sensitive than a PIR?
I'd need to test it more. Depends on the object distance and reflectivity of the 3.2GHz RF, object size, motion, ect. I'm sure it would trigger under the right conditions.
I think I would have to sort out the creaking floor boards as part of the refurbishments!
No more money going into this house, I put a roof on it and painted it. I'm done!
No way, leave it be! That's character! You can't get that in a NEW house!
JohnAudioTech, this is a cool video, thanks for making it! I had no idea such a critter was available, and for a lousy buck. Wow, very nifty.
Creaking boards are great, you can hear the wife sneaking down to the refrigerator in the early hours.
What max distance it sense
It's your fault. Immediately after watching this, I made an impulse purchase for these myself.
I look after my neighbours cat and yesterday I put a boxed RaspberryPi Zero W (WIFI) and a cat detector powered from 5v USB power bank. Running Node-RED a graphical interface it logs every 0/1 motion of the cat with time and date and emails or tweets me every 10 minutes. Node-RED is set to auto run on powerup and the Pi is running headless (no kb, mouse, HDMI) and I use SSH to log in remotely to view the text log file. Awesome!
Excellent application!
Last batch I bought did not work. Range was only 1 to 2 cm!!
No idea why
just like a radar it uses Doppler Effect .. Dope!!!!
does it detect an object thrown with gravity's Velocity? thank you
It can detect an object's motion relative to the board provided it reflects some of the RF signal.
What would be the expected power consumption/battery life if it was only triggered a few times a day?
I'd have to watch my own video to remember the power draw but I think it needed a few milliamps, so would run batteries down after several days.
Датчик движения RCWL-0516
Время задержки включения будет:
T = 245 x CTM, Где CTM - в МкФ, T - в секундах
огромное спасибо
You thinks the rf receiver can check the phase ? i vote it just picks amplitude, also did not know rf drifted frequency just by propagating.
It detects the change in frequency from moving objects due to the Doppler effect.
What,,,, No Arduino to read the sensor output. LOL. Good old fashion electronics, I like it. Almost everyone on youtube connects digital or analog outputs of gadgets to Arduinos to read them and then drive an LED when all they need is a couple 1 cent resistors and a 2 cent transistor as you did. It cracks me up these folks think that Arduino's are required for everything.
Absolutely 100% agreed. I ended up in a fight with some RUclips numbskull who had replied to a newbie about the best way to flash an LED. The questioner had absolutely zero electronics knowledge, and asked if an Arduino was the best and easiest way to flash some LEDs. The replier suggested that Arduino + I/O buffers + programming was an ideal application for beginners who wanted to learn electronics. When I called "bullshit" to that reply, I was flamed and told I was an idiot LOL.
Arduino is useful if you want to control distance and range or manipulate multiple variables to drive one LED
Of course you can do that without arduino but it’s much easier
Tested it in a small room. It sensed motion through the door and through the wall in the room next to it. I have it connected to a NANO running of a 9v battery with a LED and a buzzer and program set for 3 second output.
is it possible that it will not off when you are not leaving on its range?
If there is movement, it will detect it and not shut off. You'd have to be still.
Pir sensors and this device have the same drawback, they can be triggered by unwanted things like moving air etc.
i have some BC547 and they work just as well! :D
How
BC547 is a transistor how can it detect motion?
These sensors are very cheap and work as microwave sensors. I purchased half a dozen from Banggood because they are so cheap. They are manufactured for use in sensor security lights. The CDS connection is for a light sensor which will de-activate the security light during periods of daylight.
JohnAudioTech+ Instead of connecting a LED I want to connect a mp3 player here www.banggood.com/MP3-Format-TF-Card-Decoder-Amplifier-Board-U-Disk-Decoding-Audio-Player-Module-p-1069820.html?rmmds=myorder&cur_warehouse=CN will a 2N3904 work or is it under powered or would the BC337 work? Could you please point me in the right direction, thanks
Either transistor should work but I like the BC337.
Thanks John, I really appreciate this. I looked the 2N3904 up and it said it couldn't handle any more than 200mA and the device takes 5 ~ 5.5v and 3 watts maybe I misunderstood the ratings.
It is best to never use a pencil as a pointer around any circuit especially high frequency. I am testing a 68 ohm load resistor on 3V3 regulated voltage output to ground and see 52 mA. Starts to get a little warm at 12 volt. My LED is a 10 mm blue at 3.3 v so I don't need a dropping resistor. Yes it is best to keep it away from a breadboard to avoid inconsistent operation.
The 3.3V out can supply up to 100 ma. (I have no use for this output.)
A microwave detection module for less than a dollar. The world we live in. A few decades ago many people would have shit their pants if they could get these things at that price.
Yeah, they used to teach real science in our schools. Many, many thousands more kids were toying around with basic electronics, than are doing so today. Can't imagine what they'd have come up with!
In passing: R.I.P Radio Shack "classic"... (which is to say, the "we're not just a cellphone store" years.)
You know, it's possible to agree with Zanzubbaa1 without any inter-generational mud-slinging.
It is almost impossible not to "sling mud" on the current younger generation(s). You guys got robbed of everything and you don't even know it. So sad. So pathetic.
Wiring diagram sketchy , LED HAS + & (-) , and better how transistor is wired . Can you send in pm of messenger , a better diagram , little confused on the upper diagram . ( pos and neg of led , transistor, etc , trying … help
Will this work through say a plastic housing ??
yes
If it can be calibrated, this might be an interesting add-on for a tricorder project.
Lifeforms detected captain.
Was intrigued by this sensor as so many but found it unusable unless maybe in very limited situations. Somebody moving in a room below or above would in many cases switch on a light. Just to sensitive for in-house use, iMHo.
Can you make a Led light Dimming device & driver using this?
This is just a sensor, to control some serious load you need at least a transistor
JohnAudioTech+ Human Presence Radar (HPR) so it works with body temp and will detect larger animals. You need to keep the device 1cm away from metal. (((BC337 Transistor is a UK standard, correct? What's the American Standard?))) I thought it would offer something closer to 0.2ma instead of 0.1ma, the data sheet I was looking at says the "Out" is also 3.3v, Thanks
Also works with the water in a person or animal.
IT DETECTS CEILING OR TABLE FAN ROTATION TOO. STAYS ON UNTIL FAN BLADES ROTATION STOP COMPLETELY
I wonder if that's heat?
No, durrr… it detects MOVEMENT.
Heat is movement.
I am sorry I laughed so hard when you said you were in the closet and then when you said it detected you in the closet.
Is Toby McGuire narrating this video, the one and only Spider-Man?😂
Found these on aliexpress for less than 50 cents shipped. Need to stock up on a few
Link???
Thanks for this video. However, it kept me wondering if the sensor is actually triggered by the cat. I don't have pets, so can somebody confirm if the sensor is pets inmune? Cheers
There is no pet immune sensor, only camera+rapsberry pie with video send software can distinguish between cat/human
i suspect the sensor is detecting the cat as well
@@kitecattestecke2303 Oh, that's good to know. Can you please point me to a project on the web that implements such setup? Thanks in advance.
Motion doesn't cause a voltage difference but a frequency difference (Doppler effect).
I wasn't clear. The frequency difference causes a voltage change in the emitter circuit of the RF transistor.
Does it detects behind walls?
Yes for lighter materials, such as wood, but not metal, rock or brick.
Can't find this seller on ebay|
Just search for "Radar Motion Sensor". You'll find many.
It's more like 3 bucks, but truth to tell everyone would be better off buying the light bulb version.
Where to buy ?
Radio Shack.
so you have to be moving? can't just be still?
I mean, it is a motion sensor
You want the LD2410 module for that. That one works at 24 GHz and detects both presence and motion.
This looks like a simpler version of Soli. It's a Google's project. In Soli project they use antenna array to sense motion. atap.google.com/soli/
Can I get the code?
No code needed
If you can get it to work with an ESP8266 then your good!!!
3 pin on "JWS-D6-0402", +5v, -5v, out (to pin 8 arduino)
here is my sketch for arduino
int datPin = 8; //here was OUT pin (5v)
int ledPin = 9; // here arduino out for relay or led or buzzer
void setup() {
// put your setup code here, to run once:
pinMode(datPin,INPUT);
pinMode(ledPin,OUTPUT);
}
void loop() {
// put your main code here, to run repeatedly:
int val = digitalRead(datPin);
if(val == 1) digitalWrite(ledPin, HIGH); //here LED+Buzzer
else digitalWrite(ledPin, LOW);
}
The main difference between radar and PIR sensors is that the former detects movement towards or away from the sensor whilst the PIR type senses transverse motion.
NO - the main difference is that PIR detects movement of heat, and requires line-of-sight.
That is also the case.
99 cent, that's less than a post stamp.
Asslaiom olikum good👍👍👍👍
Be careful touching that board with a pencil...
hey man I love your videos, I can't watch this til the end, so have you finally come out of the closet yet? (forget, just joking, even in a language that I didn't manage well)
will this sensor work when there are 2 objects moving from opposite directions???