I have an Arduino Uno with a relay shield attached, the relay shield works with digital pin 4 off the arduino. I need help making the Arduino reveive PPM code from a receiver that will tell the pin 4 to go low, only for a very short time. Pin 4 needs to be set to always high until told to go low to activate the relay.
This is for wireless starting of a remote control lawn mower I am working on for a school project. Any help would be appreciated.