#include <Arduino.h>

const int temperaturSensorPin = A0;

// Segment Pins (assuming common cathode display)
const int segmentPins[8] = {0, 1, 2, 3, 4, 5, 6, 7};

// Digit Pins (common cathode)
const int digitPins[4] = {8, 9, 10, 11};

// 7-segment display encoding (0-9)
const byte digitTo7Segment[10] = {
  0x3F, // 0
  0x06, // 1
  0x5B, // 2
  0x4F, // 3
  0x66, // 4
  0x6D, // 5
  0x7D, // 6
  0x07, // 7
  0x7F, // 8
  0x6F  // 9
};

void setup() {
  // Set segment pins as output
  for (int i = 0; i < 8; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }

  // Set digit pins as output
  for (int i = 0; i < 4; i++) {
    pinMode(digitPins[i], OUTPUT);
  }

  // Turn off all digits initially
  for (int i = 0; i < 4; i++) {
    digitalWrite(digitPins[i], LOW);
  }
}

void displayDigit(int digit, int position) {
  // Turn off all digits
  for (int i = 0; i < 4; i++) {
    digitalWrite(digitPins[i], LOW);
  }

  // Set segment pins according to the digit
  for (int i = 0; i < 8; i++) {
    digitalWrite(segmentPins[i], (digitTo7Segment[digit] >> i) & 0x01);
  }

  // Turn on the specified digit
  digitalWrite(digitPins[position], HIGH);
}

void loop() {
  int readTemperatur = analogRead(temperaturSensorPin);
  int temperatur = readTemperatur / 10; // Skalieren für Anzeige

  // Extract digits
  int digits[4];
  digits[0] = temperatur / 1000;          // Tausender
  digits[1] = (temperatur / 100) % 10;    // Hunderter
  digits[2] = (temperatur / 10) % 10;     // Zehner
  digits[3] = temperatur % 10;            // Einer

  // Display each digit with multiplexing
  for (int i = 0; i < 4; i++) {
    displayDigit(digits[i], i);
    delay(5); // Small delay for multiplexing
  }
}