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Rotating object at 60RPM

Posted by James Printer on June 24, 2012 at 10:27am

Hi

I'm looking to rotate an object (probably going to be an LED lighting system) at 60RPM.

I'm familiar with using Arduino, but haven't had any experience with RC electronics.

Should I be using an ESC and somehow program it to maintain this speed on a normal servo motor? Also is this relatively low speed possible? I'd say as long as it is accurate to about 20 RPM and doesn't go lower than 60RPM it would be fine.

Thanks :)

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Replies

  • Fabien Bruning June 27, 2012 at 8:11am

    You can get relatively cheap optical encoders (about 30$) that give your Arduino the rotational speed. Simply take the desired speed, subtract the current speed and multiply that by some suitable constant. Output that to PWM and it should work. (the most basic PID controller is this)

    If you want it really cool you could probably use some diodes and a voltage regulator to create a burshless power transmitter, but the slip ring would be a lot easier I think.

  • Crispin June 24, 2012 at 4:24pm
    Google continuous servo mod. Takes any servo, 5 minutes and you good up go. Also speed is controllable.
  • James Printer June 24, 2012 at 2:37pm

    PS is there any method available that would allow a range of speeds e.g. from 30 RPM to 300 RPM?

  • James Printer June 24, 2012 at 11:12am

    Thanks Mike, that's perfect.

    I never knew about slip rings.

  • Moderator
    Michael Pursifull June 24, 2012 at 11:00am

    http://www.pololu.com/catalog/product/1248

    https://www.adafruit.com/products/775

    Happy hacking.

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