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TI Home » TI E2E Community » Support Forums » Microcontrollers » Stellaris® ARM® Microcontrollers » Stellaris® ARM® LM3S Microcontrollers Forum » 5V I/O....
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  • 5V I/O....

    5V I/O....

    • bsmith
      Posted by bsmith
      on Dec 17 2006 21:32 PM
      Prodigy40 points
      Hi,

      I'm wanting to use the board as a servo controller, but it appears that I need the PWM lines to be 0-5V instead of 0-3.3V.

      Is this possible without adding any external hardware?

      If I do need some external hardware, then would I just need a 5V source + pull up resistor, and change the PWM library to set it to GPIO_PIN_TYPE_STD_WPU?

      Or, is there something else I can do? :)

      (More to the point...does anyone know the control voltage required when controlling servos? Is it related the voltage used to power the motor?

      Thanks,

      --buddy
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    • bsmith
      Posted by bsmith
      on Dec 18 2006 20:03 PM
      Prodigy40 points
      Replying to my own post....

      I changed the GPIOPadConfig() in pwm.c to use GPIO_PIN_TYPE_STD_OD. When I connect a pull up resistor (18k or so, arbitrary....) to the motor + and the PWM output, I now get 100% working servo control.

      Excellent.....
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    • dcon76153
      Posted by dcon76153
      on Jun 08 2011 02:00 AM
      Prodigy60 points

      Dear bSmith I know it has been a while since you asked this question, but basically I have the same issue : using a 3S8962 to pilot a servo motor therefore would it be possible that you share your source code for reference.

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