This project is a smart environmental monitoring system using the ESP32 microcontroller. It measures temperature, humidity, and light intensity, helping to understand how these parameters affect plant growth, especially light dependency. The data is displayed on an I2C LCD screen and sent to ThingSpeak for cloud storage and visualization. The system also provides real-time alerts using an LED and buzzer after successful data uploads.
To help researchers and hobbyists monitor environmental conditions for plants and study light intensity's effect on plant growth, by collecting consistent sensor data and storing it in the cloud.
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| DHT22 Sensor (Temp/Hum) | 1 |
| BH1750 Light Sensor | 1 |
| I2C 16x2 LCD Display | 1 |
| LED (Indicator) | 1 |
| Buzzer (Alert) | 1 |
| Resistor (220Ω for LED) | 1 |
| Breadboard + Jumper Wires | As needed |
| Component | ESP32 Pin |
|---|---|
| DHT22 | GPIO 4 |
| BH1750 | SDA - 21 |
| SCL - 22 | |
| LCD (I2C) | SDA - 21 |
| SCL - 22 | |
| Buzzer | GPIO 5 |
| LED | GPIO 2 |
Ensure all components share a common GND with ESP32.
- Measures temperature, humidity, and light intensity
- Displays data on LCD in real-time
- Sends data to ThingSpeak every 15 seconds
- LED and buzzer activate on successful data transmission
- Useful for plant growth research in controlled environments
Install these from Arduino Library Manager:
- WiFi.h (ESP32 core)
- ThingSpeak
- DHT sensor library by Adafruit
- Adafruit Unified Sensor
- BH1750
- LiquidCrystal_I2C
- Open the
.inosketch in Arduino IDE. - Select your ESP32 board under Tools > Board.
- Install all required libraries (see above).
- Replace your WiFi and ThingSpeak credentials:
const char* ssid = "YourWiFi"; const char* password = "YourPassword"; const char* writeAPIKey = "YourWriteAPIKey"; unsigned long channelID = YourChannelID;