I'm playing around with a somewhat popular radar sensors, HFS-DC06. These are suppose to sense motion (kind of like PIR sensors, but by emitting RF instead of only sensing it. They are wired with +V, GND, and an output pin that is suppose to be high for motion and low for no motion. Here's the link:
On the HFS-DC06 I have, I've tried supplying both 5V and 3.3V on the Vcc pin, but having the same issue regardless of supply voltage; the output pin is high (4.6V) normally when powered on and no motion. My unit only senses motion once after power on, in which the voltage drops to around 0V for a few seconds, and then goes back to high (4.6V) and stays there forever even if there is motion. I need to remove and reapply power for it to sense motion again, and then it only does so once. Aside from that, the voltage level for motion/no motion seems backwards from what others report. But I've double checked to make sure my wiring matches the PCB marking.
I couldn't find anything on google about this device behaving like this. Seeing if anyone has had experience with this sensor and maybe have seen same issue? Or if my symptoms are telling?
My power supply is the Vin pin from an ESP8266, using jumper wires to put some distance between the ESP8266 and the sensor in case that matters.