How do I use a PIR (Passive infrared sensor) motion sensor to turn on a 3v battery?
I want to use a PIR to turn on a small 3v DC motor. I know that I can't just directly attach the motor to the PIR as there isn't enough power to run the motor. I have done some research and it looks like I could use a 3.3V relay as a switch to drive the higher power needed for the motor
what I want to know is how to wire it all up? Do I have to supply a separate power source to the relay to run the motor? If anyone has a schematic that would be great. I found this relay on ebay which I thought might work but I'd like to make one myself if possible.
thanks for your help.