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I'm looking for some support from other forum members interesting in motor control with encoder feedback to push this little project along ready for the winter season I've just pushed the button on a Skywatcher Star Adventurer astrophotography mount with a view to replacing the electronics with my own control system so it does what I want rather than doing what it thinks I want Looking inside the mount there is a single control board with plug and socket connections to the various components on the mount i.e. the motor/encoder, mode dial, Camera snap port, power switch etc. As supplied the mount works well for astrophotography but is seriously lacking any flexibility or thought when it comes to the timelapse functionality. This project will replace all of the Skywatcher control board including the motor driver and encoder counter, and incorporate a PID controller for position/speed control For me, very basic timelapse functionality would include: 1. Manually define left and right limits for a panning timelapse (fast slew to position camera at start and then finish). Report back defined number of degrees and maybe options to preselect a shoot mode based on frame rate required. 2. Manually select the 'framerate' by entering the total number of frames to shoot while the camera traverses the measured angle in a defined time period. 3. Selection of shot mode, either Move Stop Shoot Move or Shoot on the move. 4. Definable start delay to the imaging sequence. Camera control This should include: 1. User defined shutter durations 2. User defined shoot intervals 3. HDR options, number of frames, only bulb mode maybe with exposures longer than 0.1 seconds for reliability. Potentially an external signal to a dedicated HDR camera controller I already have. 4. Mirror lockup options 5. Camera wake up trigger to handle long start delay For astrophotography I would want 1. Standard Sidereal, lunar and solar rates 2. User definable tracking rates within system limitations 3. Plus the user camera control The 1st step will be to check what control system is in use, I assume PWM and closed loop feedback but need to check that and the nominal motor voltage. The encoder is a 4 wire device so probably power, ground, A & B signals. Once the existing system has been tested, then I'll add an external 9 pin D type connector to the casing to connect my control system into it. I would appreciate any thoughts on the best alternative Motor drive board and encoder counting options from other forum users, arduino maybe? The rest of the project coding is relatively simple once I can accurately control the speed/position of the motor.