Published April 21, 2018 © GPL3+

Temperature and Humidity Sensor

Easy to build temperature and humidity sensor with a cheap 2x16 LCD.

BeginnerProtip35,961

Things used in this project

Hardware components

Arduino Leonardo

DHT11 Temperature & Humidity Sensor (4 pins)

Adafruit Standard LCD - 16x2 White on Blue

Rotary potentiometer (generic)

Resistor 10k ohm

Story

This is just my first project on Ardiuno Project Hub.

Very simple to build, but may be usefull for those, who are looking for informations, how to connect DHT11 sensor (sketch was written in acordance with newest DHT library - april 2018).

So just build it, hack it and share it ;)

Code

DHT11 temperature and humidity sesnor with LCD on Arduino Leonardo

// DHT11 sensor

#include <DHT.h>
#define DHTPIN 7 // what digital pin we're connected to
#define DHTTYPE DHT11  //DHT 11

// LCD display

#include <LiquidCrystal.h>;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

DHT dht (DHTPIN, DHTTYPE); //Initialize DHT sensor.


void setup() {
  // put your setup code here, to run once:


// Serial.begin(9600);
dht.begin();

}

void loop() {
 delay(10000); // Waiting time between measurements
 
float t = dht.readTemperature(); // Read temperature in *C (default)
float h = dht.readHumidity(); // Read humidity %

float hic = dht.computeHeatIndex(t, h);


/*Serial.print("Temerature: ");
Serial.print(t);
Serial.print("*C\t");
Serial.print("Humidity: ");
Serial.print(h);
Serial.print("%\t");
Serial.print("Heat index: ");
Serial.println(hic);
*/



// LCD display

lcd.begin(16, 2); // display diamensions
lcd.setCursor(0,0);
lcd.print("T=");
lcd.setCursor(2,0);
lcd.print(t);
lcd.setCursor(4,0);
lcd.print("*C ");
lcd.setCursor(0,1);
lcd.print("H=");
lcd.setCursor(2,1);
lcd.print(h);
lcd.setCursor(4,1);
lcd.print("%  ");
lcd.setCursor(8,1);
lcd.print("HI=");
lcd.print(hic);

}