The motor shield I have interferes with using interrupts, PWM and servo library. So now I'm looking for a new one, any suggestions? I have a proximity sensor set up as a bump switch and would really like to move the code out of the loop and trigger the code with an interrupt. The motor shield I have uses pins 8, 9, 10, 11, 12, 13. Pins 10 & 11 are the problem.