// http://www.ardumotive.com/4-digit-7seg-display-en.html


/* 
 *  4 Digitl 7 segment display PCB board with (4) 74HC595 shift register ICs
 *  Arduino Tutorial - www.Ardumotive.com
 *  Dev: Michalis Vasilakis // Date: 23/1/2018 // Ver:1.0
 */
#include <ShiftRegister74HC595.h>

// create shift register object (number of shift registers, data pin, clock pin, latch pin)
ShiftRegister74HC595 sr (4, 2, 3, 4); 

const int pot = A0;

int value,digit1,digit2,digit3,digit4; 

uint8_t  numberB[] = {B11000000, //0
                      B11111001, //1 
                      B10100100, //2
                      B10110000, //3 
                      B10011001, //4
                      B10010010, //5
                      B10000011, //6
                      B11111000, //7
                      B10000000, //8
                      B10011000 //9
                     };
                        
void setup() { 
  blink();
}

void loop() {
  //Read from Analog1
  value=analogRead(pot);
  
  //Split number to digits:
  digit4=value % 10 ;
  digit3=(value / 10) % 10 ;
  digit2=(value / 100) % 10 ;
  digit1=(value / 1000) % 10 ;
  
  //Send them to 7 segment displays
  uint8_t numberToPrint[]= {numberB[digit4],numberB[digit3],numberB[digit2],numberB[digit1]};
  
  sr.setAll(numberToPrint); 
  
  //Reset them for next read
  digit1=0;
  digit2=0;
  digit3=0;
  digit4=0;
  delay(1000); // Read and print every 1 sec
}

//Blink

void blink(){
  for(int i = 0; i<2; i++){
    sr.setAllHigh(); // set all pins HIGH
    delay(1000);
    sr.setAllLow(); // set all pins LOW
    delay(1000);
  }
}