Limit Switches

[Lee Roberts]

If you want a microswitch to set the zero point, rather than spot a whoopsy, make sure you always use the same transition. They have huge hysteresis.

I prefer an opto slot. They usually move from high to low in a fairly straight line as the beam is interrupted. Reading it is slightly tricky because logic gates have big hysteresis, so, you add a comparator and get no hysteresis at all. Switches perfectly in either direction.

Any cable will do, if worried about interference, twist it :D

Your going to have to brake it down for me please because some of these words i know nothing about:

1, Zero Point
2, Transition
3, Hysteresis
4, Opto Slot
5, Logic Gates

[Lee Roberts]

Wow guys thanks alot for your posts i understand everything now. Hoping to get my machine to the point of "moving" htis weekend, ill update my build log with the pics and so on. Thanks again guys.