IoT Environmental Monitoring using ESP32 (Wokwi Simulation)

Author: Dharam Chandanshive

This project demonstrates how to monitor temperature, humidity, and gas levels using an ESP32 microcontroller in a simulated environment on Wokwi. The system uses a DHT22 sensor to measure temperature and humidity and a gas sensor (analog output) to detect gas concentration.

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Features

• ESP32-based monitoring (Wi-Fi capable microcontroller)
• DHT22 Sensor – Measures temperature and humidity
• Gas Sensor (Analog Output) – Detects gas levels in real time
• Serial Monitor Output – Displays sensor readings in real-time
• Fully simulated on Wokwi (no physical hardware required)

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Components Used

1. ESP32 DevKit-C V4
2. DHT22 Temperature and Humidity Sensor
3. Gas Sensor (Analog type)

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Circuit Connections

• DHT22 SDA → GPIO 4
• DHT22 VCC → 5V (ESP32)
• DHT22 GND → GND (ESP32)
• Gas Sensor AOUT → GPIO 34
• Gas Sensor VCC → 5V (ESP32)
• Gas Sensor GND → GND (ESP32)

Serial communication is connected internally to Wokwi’s Serial Monitor:

• ESP32 TX → Serial Monitor RX
• ESP32 RX → Serial Monitor TX

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How to Run the Simulation

1. Go to Wokwi.
2. Open your project file (.json).
3. Start the simulation.
4. Open the Serial Monitor to see real-time sensor readings.

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Output

• Displays temperature (°C) and humidity (%) from the DHT22.
• Shows gas sensor analog readings for detecting gas presence.

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Future Enhancements

• Add Wi-Fi connectivity to send data to a cloud platform.
• Use Blynk or MQTT for remote monitoring.
• Add alerts or buzzer when gas levels exceed a threshold.