DHT-LCD-Usage

Usage of Temperature and Humidity sensor with LCD I2C display

ABOUT THIS PROJECT

I have used Arduino UNO for this project. You can use other cards.

NOTE: If you use another board, you may need to relocate the "SDA, SCL" pins. You can find out by looking at the data sheet of the card you are using.

First, make the connection of the DHT sensor with the Arduino board.

VCC - 5V

DATA - PIN 4 (you can also use pins 3, 4, 5, 12, 13)

GND - GND

LCD connections with Arduino board

VCC - 5V

GND - GND

SDA - A4(Analog Pin 4)

SCL - A5(Analog Pin 5)

If you have connected the connections correctly it will look like this.

Red Wires indicate the VCC wires and the black ones indicate GND wires.

NOTE- If you see that your sensor is rapidly getting warm(only for 4 pin sensors) then attach a 10K pull up resistor joining VCC and Signal ends of the sensor.

Installing Libraries

DHT

Open your Arduino IDE and go to Sketch > Include Library > Manage Libraries. The Library Manager should open. Search for DHT on the Search box and install the DHT library from Adafruit.

LCD I2C

Open your Arduino IDE and go to Sketch > Include Library > Manage Libraries. The Library Manager should open. Search for LiquidCrystal I2C on the Search box and install the LCD I2C.

Demonstration

lv_0_20221028171451.mp4

LCD Failed

If you don't see any text on the LCD, try this.

Before

After