On Sun, 23 Aug 2009 19:34:30 +1000, you wrote:

>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?

Tell them you need more information to do the job properly - if you can't get your hands on it
physically get lots of photos/drawings. 

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