What I am trying to do it pretty simple. I am sending an analog voltage out of PWM of Arduino and I pass it through a LP filter. The output of the LPF gives me a relatively smooth average voltage. When I send this voltage to the A/D of xbee, the value keeps alternating between random voltages. I have defined the sampling rate and the IC on the Xbee. As soon as I connect the A/D pin to the output of the filter, the value keeps alternating.
Any help would be appreciated. Thanks.