🚀 go-pugleaf

In article <26dd5749-39csci.electronics@vpnet.chi.il.us>
akcs.rick@vpnet.chi.il.us (fred salchli) writes:
... some stuff ...
>when the animal runs. What I want is a circuit that will latch (I have
>tried various flip/flop configurations) until my I/O card reads it and
>then resets it. I have also tried an edge detection chip, but continue to
>have the same problem: If the switch is depressed the chip latches, but
>if the switch is not released immedietly, the chip records another wheel
>revolution when it finally is released. 

Sounds like the microswitch is bouncing when it opens.  A simple debounce
circuit like the following should help.

                     +5V
                      |
                      /10k
                      \
               /      /   |\ CMOS Schmitt trigger inverter 4584
      +------@/ @-----@---| >o-----------------------------------> out
      |               |   |/
      |   microsw     |
      |              ---
      |              --- 1 uF
      |               |
      |		      |
     Gnd             Gnd


The output will stay high as long as the switch is closed and will go
low about 10ms after the switch opens.

- Corey