offered by ebay, alibaba et all you'll find a verry cheap radar sensor labeled LFS-DC04 at about 1$.
Beside solder pads for Vcc, GND and OUT there are 2 solder jumpers on the pcb without any label.
As usual no information is aviable ...
Has someone this device up and running?
Does someone know the function of the jumpers?
What about the on board "light sensor"?
Is it necessary, usefull or disturbing for useing it as a motion detecting device like PIR or ultrasonic sensors. The device is a really bargin!
Thanks for any hint.