#include <SPI.h>
//Mosi Pin: 23
//Miso Pin: 19
//SCK Pin: 18
//PL Pin: 21

byte shift_1;

int latchPinRed = 33;	// Latch pin of 74HC595 is connected to Digital pin 5
int clockPinRed = 32;	// Clock pin of 74HC595 is connected to Digital pin 6
int dataPinRed = 25;	// Data pin of 74HC595 is connected to Digital pin 4

int latchPinGreen = 14;	// Latch pin of 74HC595 is connected to Digital pin 5
int clockPinGreen = 27;	// Clock pin of 74HC595 is connected to Digital pin 6
int dataPinGreen = 12;



byte ledsRed = 0;// Variable to hold the pattern of which LEDs are currently turned on or off
byte ledsGreen =0;
int pb1 = 2;
int pb2 = 4;
int pb3 = 5;
int a =0;
int b =0;
int c =0;

/*
 * setup() - this function runs once when you turn your Arduino on
 * We initialize the serial connection with the computer
 */
void setup() 
{
  Serial.begin(115200);

  SPI.setClockDivider(SPI_CLOCK_DIV128);
  SPI.setDataMode(SPI_MODE0);
  SPI.setBitOrder(MSBFIRST);
  SPI.begin();

  // Set all the pins of 74HC595 as OUTPUT
  pinMode(latchPinRed, OUTPUT);
  pinMode(dataPinRed, OUTPUT);  
  pinMode(clockPinRed, OUTPUT);
  
  pinMode(latchPinGreen, OUTPUT);
  pinMode(dataPinGreen, OUTPUT);  
  pinMode(clockPinGreen, OUTPUT);

  pinMode(pb1, INPUT_PULLUP);
  pinMode(pb2, INPUT_PULLUP);
  pinMode(pb3, INPUT_PULLUP);

  pinMode(21, OUTPUT);
  digitalWrite(21, HIGH);
  
}


void loop() 
{

digitalWrite(21, LOW);
delay(50);
digitalWrite(21, HIGH);
shift_1 = SPI.transfer(0X00);
Serial.print("Register: ");
Serial.print(shift_1,BIN);

a = digitalRead(pb1);
b = digitalRead(pb2);
c = digitalRead(pb3);

if (a == LOW){
  bitSet(ledsRed, 0);
  Serial.print(" Lamp 1 On");
  updateShiftRegister();
}else{
  bitClear(ledsRed, 0);
  Serial.print(" Lamp 1 Off");
  updateShiftRegister();
}


if (b == LOW){
  bitSet(ledsRed, 1);
  Serial.print(" Lamp 2 On");
  updateShiftRegister();
}else{
  bitClear(ledsRed, 1);
  Serial.print(" Lamp 2 Off");
  updateShiftRegister();
}

if (c == LOW){
  bitSet(ledsRed, 2);
  Serial.print(" Lamp 3 On");
  updateShiftRegister();
}else{
  bitClear(ledsRed, 2);
  Serial.print(" Lamp 3 Off");
  updateShiftRegister();
}
Serial.println();
}


void updateShiftRegister()
{
   digitalWrite(latchPinRed, LOW);
   shiftOut(dataPinRed, clockPinRed, MSBFIRST, ledsRed);
   digitalWrite(latchPinRed, HIGH);
  
     digitalWrite(latchPinGreen, LOW);
   shiftOut(dataPinGreen, clockPinGreen, MSBFIRST, ledsGreen);
   digitalWrite(latchPinGreen, HIGH);
}