I have a problem and I think it is a misunderstanding in general because I have similar problems with other sensors.
I got a PIR sensor to track moving objects. It has a digital and analog output. If I measure the voltage on the sensor directly everything seems working, let's say on the digital out is straight 5V if theres a moving object. If I plug it right into my arduino I got nearly nothing except the signal noise. I also plugged in the ground pin.
If I'm taking it right on the digital input pin there should also be 5V if there's a moving, shouldn't it?!
The sensor has VCC of 5V.
Thanks in advance! Regards, Chris