Basic Counter Problems

[jasontehman]

I'm trying to look at the basic counter example (basiccounter.ctl) and I'm using a mechanical switch hooked up through a digital input on a LabJack U3-HV. However when I press the switch, it doesn't count just one, it counts what seems to be a random number between 1 and 80, and then adds it on to the total count. Why is it doing this and how can i fix it?

[AzeoTech]

This is because mechanical switches "bounce". This is very common and exists on any mechanical switch. You need to use a debounce circuit (see any basic electronics manual) or use the debounce Timer mode of the LabJack. I'd talk to the LabJack folks about it as they are more familiar with the hardware side of things.