How to Make Simple Weather Station Using Arduino

Hello Guys, In this Blog I will explain how to make simple weather station to sense temperature and humidity using DHT11 sensor and Arduino, the sensed data will be displayed on LCD Display. Before starting this instructable you must know some information about the DHT11 sensor.

1. 
   
2. DHT11
3. 16×2 LCD Display
4. Arduino Uno
5. Male to Female Jumper Wires - 8

Step 2: About DHT11 Sensor

DHT11 is a humidity and temperature sensor. It can be used as humidity sensor as well as the temperature sensor. You can find the dht11 sensor of 2 types in the market. One is with 4 pins and another is with 3 pins. In 3 pin dht11 sensor already 10k Ohm resistor is added inside the module. The operating voltage of this module is 3.3 V. The output of this sensor is digital.

Step 3: Connecting DHT11 With Arduino

If you are using 4 pins DHT11 Connection are as follows

DHT11 Arduino UNO Vcc 3.3V Out PIN4 (Digital) GND GND NC --

Connect a 10K Ohm resistor between Vcc and Out Pin of DHT11.

If you are using 3 pins DHT11 Connection are as follows

DHT11 Arduino UNO Vcc 3.3V Out PIN4 (Digital) GND GND

Step 4: Connecting I2C LCD Display to Arduino

I already made an instructable on how to connect I2C LCD display to Arduino

You can check here https://www.instructables.com/id/How-to-Connect-I2...

I2C LCD Arduino

GND <---> GND

VCC <---> 5V

SDA <---> A4

SCL <---> A5

Step 5: Code

You must include dht11 and I2C LCD libraries. You can download below.

Download DHT11 Library

Download I2C LCD Library

Download Arduino Code

#include <dht.h>

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

dht DHT; #define DHT11_PIN 4

void setup(){

lcd.begin(16, 2); }

void loop() {

int d = DHT.read11(DHT11_PIN);

lcd.setCursor(0,0);

lcd.print("Temp: ");

lcd.print(DHT.temperature);

lcd.print((char)223);

lcd.print("C");

lcd.setCursor(0,1);

lcd.print("Humidity: ");

lcd.print(DHT.humidity);

lcd.print("%");

delay(1000);

}

Step 6: Complete Construction and Working