Just a guess, you probably need to consider the whole 21.7ms or 21.3ms to
be your period (46Hz or 47Hz) and then your duty cycle will be 8% or 6%

On Tue, Jan 19, 2016 at 10:32 AM, J B <k1llfre...@hotmail.co.uk> wrote:

> I'm trying to use the PWM module to control a parallax servo I purchased.
> I'm trying to get it to spin both ways as I need it for a project, I have
> tried to spin the servo both clockwise and anti clockwise but I do not know
> how to set a 20ms gap between each pulse, I need 1.7ms to go anti clockwise
> with a 20ms gap and 1.3ms with a 20ms gap to spin clockwise. I've converted
> the ms into frequency but it doesn't change the direction. When I plug the
> data cable into any pin on the entire board the servo spins clockwise, even
> when plugged into PWM0 and (pwm-stop 0) being called.
> On another point is there a dedicated ground pin? I plugged the PWM0 port
> into an oscilloscope and it was littered with static, according to my
> electrical engineering tutor there is a bad ground and I need to earth it.
> Another another point, my LCD display still doesn't work and I don't know
> what to do about it.
> The attachment is a datasheet for the servo I bought.
> Thanks.

John Duncan

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