Rapid urbanization and industrialization have significantly increased outdoor air pollution, posing serious risks to human health and the environment. To address this challenge, this project presents an Energy Efficient Real-Time Outdoor Air Quality Monitoring System using the Waspmote Pro Board, SGP30 multi-gas sensor, BMP180 sensor, and a Wi-Fi PRO module. The system continuously monitors key air quality parameters such as CO₂ equivalent (CO₂eq), Total Volatile Organic Compounds (TVOC), and ambient temperature in real time. The SGP30 sensor is used to measure CO₂eq and TVOC levels, while the BMP180 sensor measures ambient temperature. Based on predefined threshold values, the system provides immediate visual and audible alerts. A green LED indicates normal CO₂ levels, a yellow LED turns ON when CO₂ exceeds 500 ppm, and a red LED along with a buzzer is activated when CO₂ exceeds 600 ppm, indicating hazardous air quality. Additionally, the buzzer is triggered when the temperature rises above 35 °C to warn of high-temperature conditions. All measured parameters are displayed locally on an LCD display for real-time observation. Using the Wi-Fi PRO module, sensor data including temperature, CO₂eq, and TVOC are uploaded to the ThingSpeak cloud platform, enabling remote monitoring, data visualization, and long-term analysis. The proposed system is low power, reliable, and suitable for continuous outdoor deployment, making it an effective solution for smart city applications, environmental monitoring, and public safety enhancement.  

Objectives of proposed system are:

  To monitor CO₂ equivalent (CO₂eq) and TVOC levels using the SGP30 sensor.

  To measure ambient temperature using the BMP180 sensor.

  To implement a Wi-Fi PRO module for wireless data transmission.

  To indicate air quality status using Green, Yellow, and Red LEDs.

  To activate a buzzer when CO₂ exceeds 600 ppm or temperature exceeds 35 °C.

  To display real-time values on an LCD display.

  To upload sensor data to the ThingSpeak cloud for remote monitoring and analysis.

   The major building blocks of this project are:  

1. Adapter power supply.
2. Waspmote Pro Board
3. BMP180
4. SGP30(CO2 AND TVOC) sensor.
5. Buzzer
6. LCD display.
7. YELLOW, GREEN LEDs.
8. WI-FI PRO MODULE.

      Software’s used:

1. Embedded C programming.
2. Waspmote IDE for dumping code.
3. Express SCH for Circuit design.

   

Regulated power supply:

Block Diagram:

video: