I've ordered XBee wireless transceiver and PIR (motion, here is link) sensor.
When I enable DIO0 digital input port on XBee with "ATD0 3" command it becomes high. I measure it with volmeter and get value of 3.3v. Same with PIR sensor, when motion is detected, output pin becomes high with same 3.3v, but when it becomes low it does not pull to the ground. How is it possible to get movement alert in such scheme?
Because when movement is detected, 3.3v on both sides gives nothing, same for state of rest, when 3.3v on XBee pin and ±0v (but not ground) on PIR sensor output pin could not be detected in Xbee.
On my Arduino I had no problems with that with simply plugging PIR output pin to Digital input port.
I'm a newbie in electronics, excuse me for such dumb question and my mistakes =)