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Merge pull request #1192 from miek/debounce-fix

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Fix Debounce example to work as described
This commit is contained in:
Federico Vanzati 2013-04-16 01:22:31 -07:00
commit 97e0f34572
1 changed files with 18 additions and 4 deletions
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22
build/shared/examples/02.Digital/Debounce/Debounce.ino
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@ -19,6 +19,8 @@
by David A. Mellis by David A. Mellis
modified 30 Aug 2011 modified 30 Aug 2011
by Limor Fried by Limor Fried
modified 28 Dec 2012
by Mike Walters
This example code is in the public domain. This example code is in the public domain.
@ -43,6 +45,9 @@ long debounceDelay = 50; // the debounce time; increase if the output flicker
void setup() { void setup() {
pinMode(buttonPin, INPUT); pinMode(buttonPin, INPUT);
pinMode(ledPin, OUTPUT); pinMode(ledPin, OUTPUT);
// set initial LED state
digitalWrite(ledPin, ledState);
} }
void loop() { void loop() {
@ -62,11 +67,20 @@ void loop() {
if ((millis() - lastDebounceTime) > debounceDelay) { if ((millis() - lastDebounceTime) > debounceDelay) {
// whatever the reading is at, it's been there for longer // whatever the reading is at, it's been there for longer
// than the debounce delay, so take it as the actual current state: // than the debounce delay, so take it as the actual current state:
buttonState = reading;
}
// set the LED using the state of the button: // if the button state has changed:
digitalWrite(ledPin, buttonState); if (reading != buttonState) {
buttonState = reading;
// only toggle the LED if the new button state is HIGH
if (buttonState == HIGH) {
ledState = !ledState;
// set the LED:
digitalWrite(ledPin, ledState);
}
}
}
// save the reading. Next time through the loop, // save the reading. Next time through the loop,
// it'll be the lastButtonState: // it'll be the lastButtonState: