Subject: Re: de-bounce
From: John J. McDonough (wb8rcr@arrl.net)
Date: Fri Feb 27 2004 - 20:06:36 EST
Rich hehe - these answers are never as straightforward as you would like ... the answer is "it depends". If the switch bounce is pretty high frequency, you can pretty much squash it with a cap. However, many switches bounce for quite a long time, and the cap may do more harm than good. The best thing to do is to look at it with a scope. If you can dampen the excursions quickly then it may be a help. But a couple lines of code are always cheaper than a cap, so unless you are really pressed for space in your application I wouldn't even bother. Also look at your app. Again, in many cases some switch bounce isn't a big deal, and you don't even need to bother with the debounce code. 72/73 de WB8RCR http://www.qsl.net/wb8rcr didileydadidah QRP-L #1446 Code Warriors #35 ----- Original Message ----- From: "Rich Johnson" <rjohnson390@comcast.net> To: "Low Power Amateur Radio Discussion" <qrp-l@Lehigh.EDU> Sent: Friday, February 27, 2004 6:30 PM Subject: de-bounce > Given a push button that grounds a pullup that is input to a PIC pin is it > help the switch bounce if a 0.001uF cap is connected between the switch? By > help i mean lessen the switch bounce time? > > cheers, > rich > > >
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