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Fix Debounce example to work as described #1192

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Apr 16, 2013
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Fix Debounce example to work as described #1192

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22 changes: 18 additions & 4 deletions build/shared/examples/02.Digital/Debounce/Debounce.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,8 @@
by David A. Mellis
modified 30 Aug 2011
by Limor Fried
modified 28 Dec 2012
by Mike Walters

This example code is in the public domain.

Expand All @@ -43,6 +45,9 @@ long debounceDelay = 50; // the debounce time; increase if the output flicker
void setup() {
pinMode(buttonPin, INPUT);
pinMode(ledPin, OUTPUT);

// set initial LED state
digitalWrite(ledPin, ledState);
}

void loop() {
Expand All @@ -62,12 +67,21 @@ void loop() {
if ((millis() - lastDebounceTime) > debounceDelay) {
// whatever the reading is at, it's been there for longer
// than the debounce delay, so take it as the actual current state:
buttonState = reading;

// if the button state has changed:
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);
}
}
}

// set the LED using the state of the button:
digitalWrite(ledPin, buttonState);

// save the reading. Next time through the loop,
// it'll be the lastButtonState:
lastButtonState = reading;
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