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Boardwalk :: Forum List Luminary Micro Forums Design Stellaris 2006

bsmith

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2006/12/17 21:32

5V I/O....

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

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2006/12/18 20:03

Re:5V I/O....

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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Boardwalk :: Forum List Luminary Micro Forums Design Stellaris 2006

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