AVR-Chat

Hi John,

On Sat, May 21, 2005 at 04:39:06PM +1000, John Samperi wrote:

> The valve will be moving a maximum of 1/2 turn, so no high speed
> sensors are needed. An Absolute Position sensor would be nice
> to have to find if the valve has moved or if the valve motor
> has moved in the right direction or not moved at all i.e. faulty
> motor, broken wire, jammed/locked valve etc. as a safety precaution.

What about a simple potentiometer?  I've turned several large motors
into "servos" by attaching a 10-turn pot to their output shaft, then
read the wiper position with the on-board A/D converter to determine
position.  You get good position feedback and very easily and quickly
too.

It sounds like you could get by with a single-turn pot.

-Brian
-- 
Brian Dean
BDMICRO - ATmega128 Based MAVRIC Controllers
http://www.bdmicro.com/