big led matrix

Forum 2005-2010 (read only) Hardware Interfacing
6

The following program will perform a knight rider function with 16 LEDs using only four lines from the Arduino. This should give you an idea of what is possible.

The wiring is from the playground page though they are a bit lacking. I'll need to write it down at some point.

/* Dual hef4794 knightrider toy
Public domain by MrMeval@gmail.com
*/

int data = 9;
int strob = 8;
int clock = 10;
int oe = 11;
int count = 0;
int dato = 0;
int ack = 13;

void setup()
{
pinMode(data, OUTPUT);
pinMode(clock, OUTPUT);
pinMode(strob, OUTPUT);
pinMode(oe, OUTPUT);
pinMode(ack, OUTPUT);
}

void loop()
{
digitalWrite(ack, HIGH);
dato = 1;
for (int i = 0 ; i < 16 ; i++){
shiftOut(data, clock, LSBFIRST, dato>>8);
shiftOut(data, clock, LSBFIRST, dato);
dato = dato<<1;
digitalWrite(oe, LOW);
digitalWrite(strob, HIGH);
digitalWrite(oe, HIGH);
digitalWrite(strob, LOW);
delay(50); // waits for a moment
digitalWrite(ack, LOW);
}
dato = 32768;
for (int i = 16 ; i > 0 ; i--){
shiftOut(data, clock, LSBFIRST, dato>>8);
shiftOut(data, clock, LSBFIRST, dato);
dato = unsigned (dato)>>1;
digitalWrite(oe, LOW);
digitalWrite(strob, HIGH);
digitalWrite(oe, HIGH);
digitalWrite(strob, LOW);
delay(50); // waits for a moment
digitalWrite(ack, LOW);
}

}