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Originally Posted by MikeDubreuil
I'm trying to measure the length of a pulse from a waveform generator to the mini-rc. The signal is a simple square wave; 5 Vp-p, 25 Hz. Unfortunately, I can't seem to get interrupts on the mini-rc to detect any of the edges.
I have the function generator directly connected to the mini-RC. I am verifying the signal on an oscilloscope. Unfortunately, I just can't seem to generate interrupts unless I am removing the PWM cable from the RC. Which makes me believe the software is working at least half correctly. I think it has something to do with the internal pull-up resistor inside the RC. Can anyone shed some light on this? Thanks.
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5 Vp-p with a 2.5 V DC offset, right? That would be a train of pulses...
I'm tired and should be studying analog filters for my exam tomorrow, so the only help I can offer now is the digital input schematic from Innovation First:
http://www.ifirobotics.com/docs/anal...al--i-o-rc.pdf
It doesn't look like the pull up resistor is messing your readings, unless you're actually using a square wave that swings 2.5 V up and below ground.
Hope that didn't sound too confuse.