The secret life of switches

Chuckt · **Joined:** Sun Mar 28, 2010 1:36 pm **Posts:** 688

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 · **Posted:** Sat Apr 23, 2011 6:42 pm

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

Code:

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 · **Joined:** Fri Mar 26, 2010 10:30 pm **Posts:** 1865

Or how about this one

Code:

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

The secret life of switches

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