Hi. I have a Murata IRA-E710ST0 PIR sensor, where I've tried to attach the sensor circuit diagram and a human detection diagram. If it didn't work, here's the link:
**broken link removed**
I apply constant 5V to the drain and attach the gate to ground. When I cover the sensor so that it won't produce a signal, I get a constant voltage of about 1V from the source terminal. Is this expected? I thought that with no voltage applied to the gate, the output would be zero.
If the output voltage should be about 1V with no motion, do I need to somehow set the voltage to zero before connecting it to an op amp?
Thanks in advance for your help.