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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 = 13;
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(sensorValue); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
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