Solar Tracker Relay circuit using Arduino

I've reached the point where I need to think how I'm going to control the motor & linear actuator for my solar tracker. Things to consider - Must be able to go forwards and backwards - so that makes 4 channels, 2 for each motor. Must be able to provide enough power to drive the motors. Originally I looked at an H-Bridge Circuit, and I did buy one, but I had lots of problems with getting it to reverse th ...

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