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- const int ledPin = 13; // the pin that the LED is attached to - change this if you have a separate LED connected to another pin
- int incomingByte; // a variable to read incoming serial data into
- 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);
- }
- // if it's an L (ASCII 76) turn off the LED:
- if (incomingByte == 'L') {
- digitalWrite(ledPin, LOW);
- }
- }
- }
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