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/** Configures 8 LEDs as outputs, then flashes them so fast you can't see them turn off.
* digitalWrite(9, true) instructs Arduino Pin 9 to turn on.
* digitalWrite(9, false) instructs Arduino Pin 9 to turn off.
* Try changing the true and false values in the loop() routine
* and hit upload to see what happens.
// this sequence of steps is triggered when you reboot the microcontroller:
void setup() {
// initialize digital pins as outputs
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(A1, OUTPUT);
pinMode(A2, OUTPUT);
pinMode(A3, OUTPUT);
pinMode(A4, OUTPUT);
// this sequence of steps is triggered over and over again forever:
void loop() {
//turn on selected LEDs
digitalWrite(9, false );
digitalWrite(10, true);
digitalWrite(11, false );
digitalWrite(12, true);
digitalWrite(A1, false );
digitalWrite(A2, true);
digitalWrite(A3, false );
digitalWrite(A4, true);
//turn all the LEDs off for a bit to let them cool down (too fast to see)
digitalWrite(9, false);
digitalWrite(10, false);
digitalWrite(11, false);
digitalWrite(12, false);
digitalWrite(A1, false);
digitalWrite(A2, false);
digitalWrite(A3, false);
digitalWrite(A4, false);