This example is for Wiring version 0027+. If you have a previous version, use the examples included with your software. If you see any errors or have comments, please let us know.
Swing LEDs by BARRAGAN http://barraganstudio.com
Demonstrates the use of digital pins to turn on one light (LED) at a time in a row of 8 one after the other.
Demonstrates the use of digital pins to turn on one light (LED) at a time in a row of 8 one after the other.

int which = 0; // variable the keeps which light must be turn on next void setup() { for(int i=0; i<8; i++) { // initializes pins 0 to 7 as outputs pinMode(i, OUTPUT); } } void loop() { turn_all_off(); // turns all lights off digitalWrite(which, HIGH); // sets on the current light on delay(200); // waits for 200 milli seconds which = which + 1; // increment the variable to turn on the next one next time if(which > 7) // check for the range, if greater then 7 goes back to 0 { which = 0; } } void turn_all_off() { // function to turn off all the lights int i; // connected to digital pins 0 to 7 for(i=0; i<8; i++) { digitalWrite(i, LOW); } }