ESP32 DHT11 Sensor And monitoring with a LCD Display

Overview

This project involves using an ESP32 microcontroller to read temperature and humidity data from a DHT11 sensor. The data is sent to a specified server endpoint, and commands can be received to display messages on an I2C LCD.

Hardware Requirements

• ESP32 Development Board
• DHT11 Temperature and Humidity Sensor
• I2C LCD Display (16x2)
• Breadboard and Jumper Wires
• Power Supply (USB cable)

Software Requirements

• PlatformIO: For writing and uploading code to the ESP32.
• Flask: For running the server scripts.

Setup Instructions

1. Hardware Setup

1. Connect the DHT11 Sensor:

   • VCC to 3.3V on the ESP32.
   • GND to GND on the ESP32.
   • DATA to GPIO 4 on the ESP32.

2. Connect the I2C LCD:

   • SDA to GPIO 2 on the ESP32.
   • SCL to GPIO 3 on the ESP32.
   • VCC to 3.3V on the ESP32.
   • GND to GND on the ESP32.

2. Software Setup

2.1 ESP32 Code

1. Clone the Repository: Clone this repository to your local machine.

   git clone https://github.com/tashakid/esp32_dht11.git
   cd esp32_dht11

2. Install Required Libraries: Ensure the following libraries are included in your platformio.ini:

   lib_deps = 
       adafruit/DHT sensor library
       adafruit/Adafruit Unified Sensor
       bblanchon/ArduinoJson @ ^6.21.3
       marcoschwartz/LiquidCrystal_I2C@^1.1.4

3. Configure WiFi and API Endpoint: Create a config.h file in the src directory with the following content:

   #define WIFI_SSID "Your_SSID"
   #define WIFI_PASSWORD "Your_Password"
   #define API_ENDPOINT "URL endpoint"

4. Build and Upload the Code: Use PlatformIO to build and upload the code to your ESP32:

   pio run
   pio run --target upload

5. Open Serial Monitor: After uploading, open the serial monitor to view the output:

   pio device monitor

2.2 Server Setup

1. Install Flask: Make sure you have Flask installed in your Python environment:

   pip install Flask

2. Run the Server Script: Place the server_send.py file in your Lightning Studio IDE environment. Run the script:

   python server_send.py

   This will start the server and listen for incoming requests.

3. Testing

• Ensure the ESP32 is connected to WiFi and is publishing data.
• Check the serial monitor for any errors.

Conclusion

This project allows you to monitor temperature and humidity data from a DHT11 sensor and display messages on an I2C LCD. The integration with a Flask server provides a way to send commands to the ESP32.