From 22f8aca3ca67c349f8d402716660c7d45a536dc0 Mon Sep 17 00:00:00 2001
From: Martin Ness <m.ness@martin89.de>
Date: Mon, 26 Oct 2015 21:40:51 +0100
Subject: [PATCH] Debounce for button interrupts

---
 status/status.ino | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/status/status.ino b/status/status.ino
index a1b55ad..68f36f5 100644
--- a/status/status.ino
+++ b/status/status.ino
@@ -35,14 +35,18 @@ volatile byte state = STATE_OFF;
 // hier wird der Beginn des aktuellen Zustand gespeichert in Millisekunden nach Uptime.
 volatile unsigned long stateBegan;
 
+const long debouncing_time = 50; //Debouncing Time in Milliseconds
+volatile unsigned long last_buttonOnPressed;
+volatile unsigned long last_buttonOffPressed;
+
 // wird einmalig beim Start des Arduinos ausgeführt
 void setup() {
   pinMode(LED_G, OUTPUT);
   pinMode(LED_Y, OUTPUT);
   pinMode(LED_R, OUTPUT);
   Serial.begin(9600);
-  attachInterrupt(INTERRUPT_NAME_BTN_ON, buttonOnPressed, RISING);
-  attachInterrupt(INTERRUPT_NAME_BTN_OFF, buttonOffPressed, RISING);
+  attachInterrupt(INTERRUPT_NAME_BTN_ON, buttonOnPressedDebounce, RISING);
+  attachInterrupt(INTERRUPT_NAME_BTN_OFF, buttonOffPressedDebounce, RISING);
 }
 
 // bildet den aktuellen Zustand auf die LEDs ab
@@ -85,11 +89,25 @@ void loop() {
   delay(10);
 }
 
+void buttonOnPressedDebounce() {
+  if (millis() - last_buttonOnPressed >= debouncing_time) {
+    buttonOnPressed();
+    last_buttonOnPressed = millis();
+  }
+}
+
 void buttonOnPressed() {
   state = STATE_ON;
   stateBegan = millis();
 }
 
+void buttonOffPressedDebounce() {
+  if (millis() - last_buttonOffPressed >= debouncing_time) {
+    buttonOffPressed();
+    last_buttonOffPressed = millis();
+  }
+}
+
 void buttonOffPressed() {
   state = STATE_OFF;
 }