// EXAMPLE 04 : Blinking LED const int LED = 7; // digital pin 7 for LED int i = 0; // i for cout up and down void setup() { pinMode(LED, OUTPUT); // set LED pin as OUTPUT } void loop() { for (i = 0; i < 255; i++) { // 0 to 255 loop (fade inn) analogWrite(LED, i); // setting LED brightness delay(1); // hold LED } for (i = 255; i > 0; i--) { // 255 to 0 loop (fade out) analogWrite(LED, i); delay(1); // hold LED } }