On Mon, 25 May 2009, Anders Wallin wrote:
> Date: Mon, 25 May 2009 18:25:32 +0300
> From: Anders Wallin <anders.wal...@helsinki.fi>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] Servo Control
>
>
> R/C Servos take a digital pulse input at around 50 (or 100?) Hz.
> The width of the pulse determines the position of the servo.
> A width of 1.5 ms is the central position, and 1.0 ms is full left (for
> example), while 2.0 ms is full right.
>
> if you have digital I/O connected to EMC (parallel port or a pci-card)
> and a machine that can run with a base_period of 25us that would mean
> around 40 base_period's for the full range of motion of the servo.
> Do you need more resolution? Some machines may be able to run with a
> shorter base_period.
>
> There might be an existing PWM HAL component you can use to produce this
> output, but it's not hard to code your own if you need to.
>
> Anders
Oops Anders is right on resolution I'd forgotton that RC servos use such a
narrow range of pulse widths
Peter Wallace
Mesa Electronics
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