I have 2 Arduinos, one for running accelstepper and the other for using firmata so I can send values from pc. I did this because I was having a hard time getting serial communication to work correctly and have the accelstepper running at the same time. So my thought now was to use the PWM out from one Arduino to analog in on the other. I cant use i2c or serial, I guess the simplest way would be if there was some way for the second Arduino to read the pwm directly without having to make an analog to digital converter.
has anyone done this before? Any help links to something simple would be fantastic.