AutoGuiding a telescope with an Arduino Uno and PHD etc

This was developed to AutoGuide a Meade LX10, but could be used for other scopes including those with a ST-4 interface.

It uses an Arduino Uno to accept control commands, Meade Ascii codes, from suitable guide software on a PC, or Raspberry Pi, via USB, eg PHD, and drives 4 outputs to move the Scope.

See 'Pi-AutoGuider' on github for the Raspberry Pi AutoGuider.

You need to provide the Relay Card. The details here show how to use a Seeed 4 Relay card but you could use any suitable relays or solid state relays.

Please take care when interfacing to your scope. At your own risk.