RCWL-0516 Motion Detection Sensor, Microwave Radar Sensor, Switch Module, for Arduino ESP8266 Nodemcu Wemos, for Raspberry PI, for Human Rat Cat Detector, Detection Distance 5-7m

Good sensor but it have not adjustment for time delay and distance

No failures and work great on my projects. Very easy to hook up and fast reaction times

These work OK but they draw too much power for battery operated remote sensors.

This device is suppose to work at 7 meters (21 ft), but could only get it to work at about 6 cm (2 inches). I've tried everything. There is not much written elsewhere about the device except for a writeup on github and couple of YouTube videos. The YouTube videos didn't go into much detail on distance. It's a shame since a doppler part would be great for my application. These devices may be defective but I'll look elsewhere for a motion detector.Update: I changed the ratings from 2 to 4 stars. Found that adding 1.5 ft of cable and moving it far from the circuitry, the motion distance increased to greater than 17'. Moved the sensor back near the circuitry keeping the cable and the distance shortened to 6cm again. This is probably due to picking up harmonics and other electrical noise but can't be certain. If you can put the sensor far from your circuitry this is a pretty good sensor, otherwise try something else.

Great sensors. Works like they should. Have to solder them though. Just what I needed for my experiments!

I put together a little media jukebox for the trick-or-treaters (as if we will have any of THOSE this year, but you never know), and I'm using this instead of a PIR. It's got a good range (21 feet about, as advertised), is sensitive and quick. A little hard to test in development because it sees all close-hand vibration as motion.The circuit itself is very clever, radar on a PCB trace! It takes 5v in and outputs a 3v3 signal as well as 3v3 reference voltage (thought I don't know how much current it can source).Extremely simple and easy to use.