dht11.cpp

// include the library code:
#include <dht.h>
#define dht_apin A0
#include <LiquidCrystal.h>
dht DHT;

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2, temp = dht_apin;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  
  Serial.begin(9600);
  delay(500);
  Serial.println("DHT11 Humidity & temperature sensor\n\n");
  delay(1000);
  Serial.print(DHT.temperature);
  Serial.print("C ");
}

void loop() {
  /* Only update every 1 second */
  int timer = (millis() % 1000);
  if (timer != 0) {
    // if timer is not 0, then return and skip the rest of the function
    return;
  }

  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 0);
  lcd.print("Temperature is");

  int throwaway = DHT.read11(dht_apin);

  float celsius = DHT.temperature; // Read temp from sensor
  Serial.print(celsius);
  lcd.print(celsius);
}