Commit WIP code

demos/button/button.ino

@@ -0,0 +1,30 @@
+// Button Input pullup demo
+// Connect to D19
+// Note: no debounce logic
+
+const int BUTTON_PIN = 19; // GIOP19 pin connected to button
+
+// Variables will change:
+int lastState = LOW;  // the previous state from the input pin
+int currentState;                // the current reading from the input pin
+
+void setup() {
+  // initialize serial communication at 9600 bits per second:
+  Serial.begin(115200);
+  // initialize the pushbutton pin input
+  // the pull-up input pin will be HIGH when the switch is open and LOW when the switch is closed.
+  pinMode(BUTTON_PIN, INPUT_PULLUP);
+}
+
+void loop() {
+  // read the state of the switch/button:
+  currentState = digitalRead(BUTTON_PIN);
+
+  if(lastState == HIGH && currentState == LOW)
+    Serial.println("The button is pressed");
+  else if(lastState == LOW && currentState == HIGH)
+    Serial.println("The button is released");
+
+  // save the the last state
+  lastState = currentState;
+}