#define MAX7219_Data_IN 8
#define MAX7219_Chip_Select  10
#define MAX7219_Clock 9

#define OP_NOOP   0x00
#define OP_DIGIT0 0x01
#define OP_DIGIT1 0x02
#define OP_DIGIT2 0x03
#define OP_DIGIT3 0x04
#define OP_DIGIT4 0x05
#define OP_DIGIT5 0x06
#define OP_DIGIT6 0x07
#define OP_DIGIT7 0x08
#define OP_DECODEMODE  0x09
#define OP_INTENSITY   0x0a
#define OP_SCANLIMIT   0x0b
#define OP_SHUTDOWN    0x0c
#define OP_DISPLAYTEST 0x0f
int sensorPin = A0;   // select the input pin for the potentiometer
int ledPin = 13;      // select the pin for the LED
int sensorValue = 0;

void shift(byte send_to_address, byte send_this_data)
{
  digitalWrite(MAX7219_Chip_Select, LOW);
  shiftOut(MAX7219_Data_IN, MAX7219_Clock, MSBFIRST, send_to_address);
  shiftOut(MAX7219_Data_IN, MAX7219_Clock, MSBFIRST, send_this_data);
  digitalWrite(MAX7219_Chip_Select, HIGH);
}

const byte interruptPin = 2;


void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  Serial.println("PolinemaJaya");
  pinMode(MAX7219_Data_IN, OUTPUT);
  pinMode(MAX7219_Chip_Select, OUTPUT);
  pinMode(MAX7219_Clock, OUTPUT);
  digitalWrite(MAX7219_Clock, HIGH);
  delay(200);

  //Setup of MAX7219 chip
  shift(OP_DISPLAYTEST, 0x00); //display test register - test mode off
  shift(OP_SHUTDOWN, 0x01);    //shutdown register - normal operation
  shift(OP_SCANLIMIT, 0x07);   //scan limit register - display digits 0 thru 7
  shift(OP_INTENSITY, 0x0f);   //intensity register - max brightness
  shift(OP_DECODEMODE, 0xff);  //decode mode register - CodeB decode all digits
  pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), pertambahan, FALLING);
}


volatile int nilai_naik;

void pertambahan() {
  nilai_naik++;
  //delay(1000);
}



void tampilan_ss(int ni) {
  int satuan, puluhan, ratusan, ribuan;

  int nilai = ni; // Menentukan nilai yang ingin ditampilkan (nilai i yang sedang diproses).
  ribuan =  nilai / 1000;
  nilai = nilai % 1000;
  ratusan = nilai / 100;
  nilai = nilai % 100;
  puluhan = nilai / 10;
  satuan = nilai % 10;

  shift(OP_DIGIT7, 0x0F); //digit 7 (leftmost digit) data
  shift(OP_DIGIT6, 0x0F);
  shift(OP_DIGIT5, 0x0F);
  shift(OP_DIGIT4, 0x0F);
  // Mengirimkan nilai ke register - register MAX7219 untuk menampilkan angka.
  if (ni >= 1000) shift(OP_DIGIT3, ribuan); else shift(OP_DIGIT3, 0x0F);
  if (ni >= 100) shift(OP_DIGIT2, ratusan); else shift(OP_DIGIT2, 0x0F);
  if (ni >= 10)  shift(OP_DIGIT1, puluhan); else shift(OP_DIGIT1, 0x0F);

  shift(OP_DIGIT0, satuan); //digit 0 (rightmost digit) data

}
void loop() {
  sensorValue = analogRead(sensorPin);
  delay(100);
  tampilan_ss(sensorValue);
  Serial.print("Potensiometer =");
    Serial.println(sensorValue);

    }