coding for limit switch

[Alan Anderson]

Instead of forcing the motor to run for "a while" when a limit switch is tripped, you can just use the switch to keep the motor from going any further in the wrong direction. Don't worry about moving it away, just worry about keeping it from going past the limit.

The typical way to do this is to splice into the speed control value. Set it to zero if one limit switch is active and the incoming value is positive, or if the other switch is active and the value is negative. This will stop the motor as it drives into the limit, and you can rely on other signals to drive the motor back.

[nathanww]

If you do just stop when you hit the limit switch,your PID will probably generate a significant amount of error for a relativley long period of time. If you're using the error amount to perform hardware diagnostics(like we did last year), this could cause false positives