#include <DHT.h>

// Pins connected to 74HC595
const int latchPin = 8;
const int clockPin = 12;
const int dataPin = 11;

// Mapping of digits to segments for a common-anode 7-segment display
const byte digitToSegment[10] = {0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90};

// DHT setup
#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);

  dht.begin();
}

void loop() {
  float temp = dht.readTemperature();

  int tempInt = (int)temp; // truncate decimal
  int digit1 = tempInt / 10; // tens place
  int digit2 = tempInt % 10; // ones place

  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, digitToSegment[digit1]);
  shiftOut(dataPin, clockPin, MSBFIRST, digitToSegment[digit2]);
  digitalWrite(latchPin, HIGH);
  delay(2000);
}