Just to clear this up. I put a 270pF capacitor across the optoisolator input pins and the problem went away - a wee bit of noise on the signal...
Jimbo, I am controlling the Arduino directly via the IDE serial monitor. The power turns on and off without a problem, and the serial monitor...
Hello everyone, I'm a programmer who has agreed to help a close friend sort his DCC system out. It's complicated and will take a while. I decided...