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Software/Arduino Firmware/ArduinoXojoGUI/ArduinoXojoGUI.ino

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+// Arduino IDE:
+// File -> Examples -> 04.Communication -> PhysicalPixel
+
+const int ledPin = 13; // pin the LED is attached to
+int incomingByte;      // variable stores  serial data
+
+void setup() {
+  // initialize serial communication:
+  Serial.begin(9600);
+  // initialize the LED pin as an output:
+  pinMode(ledPin, OUTPUT);
+}
+
+void loop() {
+  // see if there's incoming serial data:
+  if (Serial.available() > 0) {
+    // read the oldest byte in the serial buffer:
+    incomingByte = Serial.read();
+    // if it's a capital H (ASCII 72), turn on the LED:
+    if (incomingByte == 'H') {
+      digitalWrite(ledPin, HIGH);
+      Serial.println("Getting H"); //print out to serial monitor to check state
+    }
+    // if it's an L (ASCII 76) turn off the LED:
+    if (incomingByte == 'L') {
+      digitalWrite(ledPin, LOW);
+      Serial.println("Getting L"); //print out to serial monitor to check state
+    }
+  }
+}