ESP32 - DHT11 - LCD
This tutorial instructs you how to program ESP32 to read temperature and humidity from DHT11 and display them on LCD I2C.
Hardware Used In This Tutorial
|1||×||ESP-WROOM-32 Dev Module|
|1||×||USB Cable Type-C|
|1||×||LCD I2C 16x2|
|1||×||DHT11 Temperature and Humidity Sensor|
|1||×||(Optional) DC Power Jack|
|1||×||(Recommended) ESP32 Screw Terminal Adapter|
Or you can buy the following sensor kit:
|1||×||DIYables Sensor Kit 30 types, 69 units|
Introduction to DHT11 and LCD
We have specific tutorials about DHT11 sensor and LCD. Each tutorial contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn more about them at the following links:
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
Note that the DHT11 sensor can works with 5V or 3.3V, so you can connect the VCC pin of DHT11 to 3.3V pin or 5V pin
In the above diragram, LCD is powered from ESP32 board, in some cases, it may not provide enough power for the LCD display. If LCD does not display anything, power LCD by external power source as below:
- If powering ESP32 via Vin pin and LCD with external power source
- If powering ESP32 via USB port and powering LCD with external power source
ESP32 Code - DHT11 Sensor - LCD I2C
※ NOTE THAT:
The LCD I2C address can be different from each manufacturer. In the code, we used address of 0x27 that is specified by DIYables manufacturer
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- On Arduino IDE, Navigate to Tools Manage Libraries
- Type “DHT” on the search box, then look for the DHT sensor library by Adafruit
- Install the library by clicking on Install button.
- A windows appears to ask you to install dependencies for the library
- Install all dependencies for the library by clicking on Install All button.
- Type “LiquidCrystal I2C” on the search box, then look for the LiquidCrystal_I2C library by Frank de Brabander
- Click Install button to install LiquidCrystal_I2C library.
- Copy the above code and paste it to Arduino IDE.
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- Make the sensor colder or hotter. For example, putting the sensor near a hot cup of coffee
- See the result in LCD
If LCD displays nothing, see Troubleshooting on LCD I2C
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