The RCWL-0516 is an inexpensive proximity sensor that works using microwaves and Doppler Radar. It can be used on its own or with an Arduino, I will show you both ways.

Today we will look at another proximity sensor, the RCWL-0516. This device works using microwaves and the Doppler Effect to detect the presence of humans (and other creatures) in a room. It is inexpensive and can be used by itself or in conjunction with an Arduino.

Don't be concerned about the microwave aspect, this device emits a very low level of microwave radiation at 3.18 GHz, which is on the low-end of the microwave spectrum. It is perfectly safe to experiment with and to use in your projects.

The device is very inexpensive and can be obtained on eBay, Amazon, and probably at your local electronics shop (which is where I got mine) for around 2-3 US dollars.

The RCWL-0516 operates using the "Doppler Effect", a phenomenon discovered in 1842 by Austrian physicist Christian Doppler. The Doppler Effect describes a change in frequency observed by a stationary observer when the source of the frequency is moving.

If you have ever heard the sound of a train as it races towards and then away from you, or an ambulance as it races down the road, you will have heard the siren frequency changing as the object approaches, passes, and moves away from you. That is the Doppler Effect in action.

In the RCWL-0515 microwaves are sent out and reflected back. Any moving object in the area will change the frequency of the reflected waves, thus triggering the device.
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I'll openly admit that microwave circuitry is such a specialist area where the only people who truly understand it are those who work with that type of circuitry all the time. It's not just a specialist area of electronics, but a specialist subsection of RF design where simple things like tracks stop behaving like conventional conductors.
Now I understand this circuitry better it all makes a lot more sense. It's got strong similarities to the Colpitts oscillator FM micro transmitters I used to make for the 88-108MHz frequencies - not 300MHz as I mentioned in the video. (Well not deliberately.)
The chip being used on this breathtakingly cheap and versatile module is a customised BISS0001 with a rarely used pin repurposed as the input to an internal 3.3V voltage regulator. That removes the need for a separate regulator on the PCB.
Here's a search link to find these modules on eBay. Target price less than a US dollar each:-
[ Ссылка ]...




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