DHT11

#include <stdlib.h>
#include <avr/io.h>
#include <util/delay.h>
#include <stdio.h>

#include "dht.h"

// Trying to set up the DHT11 so it can be used in this project
void read() {
  // The bits are for to get the temprature values in.
  uint8_t bits[5];
    uint8_t i, j = 0;

  // Setting up the DDRD as OUTPUT and PORTD as HIGH
  DDRD |= (1 << DDD5);
  PORTD |= (1 << PORTD5);
  _delay_ms(100);

  /*
   * Makes an request to get the data from the DHT11
   * Set the the PORTD5 as LOW
  */
  PORTD &= ~(1 << PORTD5);
  _delay_ms(18);
  // Setting it back to high and DDRD as an input
  PORTD |= (1 << PORTD5);
  _delay_us(1);
  DDRD &= ~(1 << DDD5);

  /*
   * Checking to see if the ACK is happening
  */
  _delay_us(40);
  if ((PIND & (1 << PIND5))) {
    return;
  }
  _delay_us(80);
  if (!(PIND & (1 << PIND5))) {
    return;
  }
  _delay_us(80);


  // Reading the data and starts with bits 0 up to 4
  for (j = 0; j < 5; j++) {
        uint8_t result = 0;
    // I read every bit in the system to be able to get it in to the bits.
        for (i = 0; i < 8; i++) {
            while (!(PIND & (1 << PIND5)))
                ; //wait for an HIGH input
        // delay for 30us
            _delay_us(30);
      //if the input is HIGH then I will put the data in result
            if (PIND & (1 << PIND5))
                result |= (1 << (7 - i));
            while (PIND & (1 << PIND5))
                ; //wait until input get LOW
        }
    //Put the result in the bit
        bits[j] = result;
    }

  // Resets the pins
  DDRD |= (1 << DDD5);
  PORTD |= (1 << PORTD5);
  _delay_ms(100);


  //checks the sum and gets the temprature
  if (bits[0] + bits[1] + bits[2] + bits[3] == bits[4]) {
    printf("Temperature: %d\n", bits[2]);
  }
  //printf("Temprature: %d\n", temprature);
  _delay_ms(2000);
}