#include <Wire.h>

const int ledPin1 = 24;
const int ledPin2 = 25;
const int ledPin3 = 26;
const int ledPin4 = 27;
int sw1 = 28;
int sw2 = 29;
int sw3 = 30;
int sw4 = 31;

void setup() {
  pinMode(sw1, INPUT);
  pinMode(sw2, INPUT);
  pinMode(sw3, INPUT);
  pinMode(sw4, INPUT);
  
  Wire.begin();
  delay(500);
}

void loop()
{
  const int lookup[11] = {0x00, 0x06, 0x5B, 0x4F, 0x66};
  int Count, Thousands, Hundreds, Tens, Base;
  Wire.beginTransmission(0x38);
  Wire.write((byte)0);
  Wire.write(B01000111);
  Wire.endTransmission();
  
  Wire.beginTransmission(0x38);
  Wire.write((byte)1);

  if(digitalRead(sw1)==LOW) {
    Base = 1;
  }
  else {
    Base = 0;
  }
  if(digitalRead(sw2)==LOW) {
    Tens = 2;
  }
   else {
     Tens = 0;
   }
  if(digitalRead(sw3)==LOW) {
    Hundreds = 3;
  }
   else {
     Hundreds = 0;
   }
  if(digitalRead(sw4)==LOW) {
    Thousands = 4;
  }
    else {
    Thousands = 0;
  }
  
  Wire.write(lookup[Base]);
  Wire.write(lookup[Tens]);
  Wire.write(lookup[Hundreds]);
  Wire.write(lookup[Thousands]);

  
  Wire.endTransmission();
}