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Turns on an LED on for one second, then off for one second, repeatedly.
This example code is in the public domain.
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led_tx = 72;
int led_rx = 73;
// the setup routine runs once when you press reset:
void setup()
// initialize the digital pin as an output.
pinMode(led_tx, OUTPUT);
pinMode(led_rx, OUTPUT);
// the loop routine runs over and over again forever:
void loop()
digitalWrite(led_tx, HIGH); // turn the LED on (HIGH is the voltage level)
digitalWrite(led_rx, LOW);
delay(500); // wait for a second
digitalWrite(led_tx, LOW); // turn the LED off by making the voltage LOW
digitalWrite(led_rx, HIGH);
delay(500); // wait for a second