Things used in this project


Night Rider CodeC/C++
Using three 74HC595s to control 24 leds (outputs) on the arduino uno. 
This is an improved version by John Rogers

int latchPin = 5;   // to pin 12
int clockPin = 6;	// to pin 11
int dataPin = 4;	// to pin 14

int numLights=24;
unsigned long light = 0;  // Bit pattern for entire display
byte b1 = 0;				// byte place holders for each shift register
byte b2 = 0;				// extracted from "light"
byte b3 = 0;


void setup() 
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);  
  pinMode(clockPin, OUTPUT);
 // Serial.begin(9600);

void loop() 
	for (int i = 0; i < numLights*2; i++)
		int shift = i;
		if( i >= numLights )	//if i is above numlights then wee need to start
		{						// moving back to the left.
			shift = numLights*2 - i - 1;
		// Extract the bytes of the light patter to be sent out
		light = (long)(1)<<shift;
		b1 = (byte)((light>>16)&0xFF);
		b2 = (byte)((light>>8)&0xFF);
		b3 = (byte)((light)&0xFF);
		updateShiftRegister();	// shift out b1, b2 and b3

void updateShiftRegister()
   	digitalWrite(latchPin, LOW);
   	shiftOut(dataPin, clockPin, MSBFIRST, b1);
   	shiftOut(dataPin, clockPin, MSBFIRST, b2);
   	shiftOut(dataPin, clockPin, MSBFIRST, b3);
   	digitalWrite(latchPin, HIGH);


David A Riewe

Engineering Tech who enjoys hacking electronics, learning about new devices and programming. Founder of HackerSpaceTech


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