Real-Time Air Quality Monitoring System

Author: Haim Ozer

This project is designed to monitor air quality in real-time using the ESP32-WROOM-32D microcontroller. The system utilizes I2C sensors to measure CO2 levels, temperature, and humidity, and displays the data on a 16x2 LCD screen. It is designed to demonstrate real-time data collection, processing, and display in an embedded environment. Additionally, motion detection can be incorporated to trigger data.

Project Overview

This system monitors the following environmental conditions:

• CO2 Levels: Using the ENS160 sensor.
• Temperature & Humidity: Using the AHT21 sensor.
• Display: Information is displayed on a 16x2 I2C LCD screen.

Video Presentation:

Watch the video presentation of the project for an overview of the real-time air quality monitoring system in action. Check out the video presentation of the project.

Wiring Diagram:

wiring images on the breadboard to understand how the components are physically connected. Check out the wiring images.

Technologies Used:

• ESP32-WROOM-32D microcontroller for real-time data processing
• C++ for firmware development
• PlatformIO IDE integrated with VS Code
• Arduino Core for ESP32
• I2C Communication for sensor data transfer
• Real-time environmental monitoring

Real-Time Embedded Software Concepts:

• Real-Time Data: The system continuously collects sensor data and updates the LCD display in real-time.
• Sensor Integration and I2C Communication: The ENS160 and AHT21 sensors are connected via I2C, demonstrating proficiency in interfacing with multiple sensors on the same communication bus.
• Efficient Resource Management: The project showcases resource-efficient coding to ensure timely sensor reads, data updates, and power management.
• Real-Time Debugging and Optimization: Serial output is used for real-time debugging, a key skill in embedded software engineering.

This project highlights key skills applicable to real-time embedded systems and low-level programming.

Libraries Required:

To run this project, make sure the following libraries are installed:

1. ScioSense_ENS160 (ScioSense_ENS160.h) for the ENS160 CO2 sensor.
2. Adafruit AHT10/AHT20/AHT21 (Adafruit_AHTX0.h) for the AHT21 temperature and humidity sensor.
3. LiquidCrystal_I2C for the LCD display.
4. Wire.h for I2C communication.

Hardware Setup:

Here is the pin configuration for connecting the sensors to the ESP32:

Component	SDA Pin	SCL Pin	Other Pins
ENS160	D12	D13	ADD = D14, CS = D27, NT = D26
AHT21	D12	D13	-
LCD I2C	D4	D16	-

Installation and Setup Guide:

1. PlatformIO Setup:

   • Install PlatformIO in Visual Studio Code.
   • Open VS Code, navigate to the Extensions tab, and search for "PlatformIO IDE."
   • Install the extension and restart VS Code.

2. Cloning the Project: Clone this repository or copy the source code into your local machine.

3. Library Installation: PlatformIO automatically resolves libraries. Ensure your platformio.ini contains the correct dependencies:

   [env:esp32]
   platform = espressif32
   board = esp32dev
   framework = arduino
   lib_deps =
       adafruit/Adafruit AHT10/AHT20/AHT21@^1.2.0
       ScioSense_ENS160
       LiquidCrystal_I2C