I've been asked to design some electronics for a device that moves a 
tray from the horizontal position to a 45 degree position left and 
right of horizontal. 

The person already has the apparatus and a standard 12v DC motor and 
operates the device manually at this moment. I'm providing other 
requirements and this has been thrown into the mix.

I'm toying with the following as cheap and not requiring too much 
after market fixing as sensors for detecting the top of the 45 deg 
swing to stop the motor via a Pic.

The motor will be moving slowly - I'm not sure how slow, but it moves 
eggs so I would think hospital lift slow!

Tilt sensors - when it reaches the correct angle the little ball 
either makes or breaks contact - I think break would be better.

Microswitch  - worried that long term positioning might be a problem.

Reed Switch - I reckon this would be the easiest to fit and cheapest.

Opto Switch - Either with cam or just blocking a LEd.

Bearing in mind that I haven't the faintest idea what the contraption 
looks like and that I won't be able to get my hands on one to play 
with, does anyone have any thoughts on my ideas?

Thanks

Colin
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cdb,   23/08/2009
 
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colin@btech-online.co.uk

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