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Chapter17/cib/libs/etl/examples/Debounce/Debounce.ino

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+//***********************************************************************************
+// A debounce demo that reads a key and toggles the LED.
+// Set the pin to the correct one for your key.
+//***********************************************************************************
+
+#include <debounce.h>
+
+const int SAMPLE_TIME    = 1;    // The sample time in ms.
+const int DEBOUNCE_COUNT = 50;   // The number of samples that must agree before a key state change is recognised.   50 = 50ms for 1ms sample time.
+const int HOLD_COUNT     = 1000; // The number of samples that must agree before a key held state is recognised.   1000 = 1s for 1ms sample time.
+const int REPEAT_COUNT   = 200;  // The number of samples that must agree before a key repeat state is recognised.  200 = 200ms for 1ms sample time.
+const int KEY            = XX;   // The pin that the key is attached to.
+
+void setup()
+{
+  // Initialize LED pin as an output and set off.
+  pinMode(LED_BUILTIN , OUTPUT);
+  digitalWrite(LED_BUILTIN, LOW);
+  
+  // Initialize KEY pin as an input.
+  pinMode(KEY, INPUT);
+}
+
+void loop()
+{
+  static int led_state = LOW; 
+  static etl::debounce<DEBOUNCE_COUNT, HOLD_COUNT, REPEAT_COUNT> key_state;
+
+  if (key_state.add(digitalRead(KEY) == HIGH)) // Assumes 'HIGH' is 'pressed' and 'LOW' is 'released'.
+  {
+    if (key_state.is_set())
+    {
+      led_state = (led_state == LOW ? HIGH : LOW); // Toggle the LED state on every validated press or repeat.
+      digitalWrite(LED_BUILTIN, led_state);
+    }
+  }
+  
+  delay(SAMPLE_TIME); // Wait 1ms
+}