Removing Excess Weight

I carefully looked over the entire mechanism to decide which parts to keep.

The main circuit board worked and using serial could be commanded to go to a position or even store positions, but it lost out due to not supporting the speeds I wanted to control. I specifically wanted to be able to go from 1 revolution per day (About 0.0007 RPM), up to about 15 RPM.

Even if the board couldn’t be used whole, it still contained bipolar stepper motor drivers. It used matched pairs of L297’s and L298’s. I quickly decided against using these due to the simplicity and size of the EasyDriver.

Out came the 48VAC to 24VAC toroidal transformer and I was left with this:

If space permits, the camera can be mounted on this plate upside down, and it will Pan and Tilt around it's nodal point.

The Pan and Tilt axis both have magnetic sensors for “home” positions. I’ll probably add limit switches to the Pan axis, mainly for when it powers up to calibrate itself. If I didn’t, the only way to calibrate the Pan axis with a “middle of travel” sensor is by traveling full travel in one direction (hitting the physical stop and stalling the motor) each time, which just seems plain wrong.

1 Comment »

  • David E

    Hi John
    I am trying to track down a cheap pan tilt head and was wondering if you could let me know where you acquired yours from? Thanks

    Comment | 24 July 2011

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