The secret life of switches

[Chuckt]

http://www.eetimes.com/discussion/break ... f-switches

When you open or close a switch, they sometimes touch multiple times and when you use high speed microcontrollers, sometimes you can get multiple results for the switch which could cause problems. This article gives you a little insight.

[bitfogav]

Thats very true, thats why when programming a microchip after a switch being pressed we had some code a bit like this:

Code: Select all

if button = pressed then
    // put your code here
    delayms(20)     //==== debounce delay for button
endif

Has you can see the delayms is the switch debounce delay.

[brad]

Or how about this one

Code: Select all

Sub CheckButton()
     If ButtonDebounce <> 0 then
          dec(ButtonDebounce)
     Else
          If ButtonPressed = true then
               ButtonDebounce = 10
               do this code here...
          Endif
     Endif
End Sub