Hi Tom
Thanks for the reply, I have just received my mega and relay board today so haven't tried anything yet I was just wanting to understand how to achieve this and then try writing some code so I would be ready when the rest of the equipment arrives (separate power supply for relay board and linear actuator).
The reason I want all actuators to work at the same time is I am going to try to control a platform which will tilt at angles.
Thanks
Andy