Although I'm probably not the one that can help, if you suspect interference, please provide a schematic diagram / wiring diagram. A photo of a handdrawn one is fine; it should contain all connections between components as well as ALL power/gnd connections. A photo of your setup might also help. Please provide product info about (preferably links to) all components that you use; don't forget motors/heaters etc.
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project 
See About the IDE 1.x category.