Project Hub /Renewable Energy Power & Sustainability/Solar Tracking Systems (Single/Dual Axis)/Simple Air-Quality & Gas Monitor With Notifications On Phone & Email

Simple Air-Quality & Gas Monitor With Notifications On Phone & Email

Intermediate

ARDUINO

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

Simple Air-Quality & Gas Monitor With Notifications On Phone & Email

An IoT-based air quality and gas monitor using a WeMos D1 board and the Blynk platform to send real-time alerts to smartphones and email.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

NodeMCU ESP8266 WIFI development board based on CP2102 Rs. 660.00
MQ-2 Smoke Sensor Detector Module Rs. 129.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Cable for Arduino Nano (USB 2.0 A to USB 2.0 Mini B) 30cm Rs. 69.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: MQ-135 / other MQ Gas Sensor

Browse all components

How It Works

The Simple Air-Quality & Gas Monitor functions as an integrated Internet of Things (IoT) sensing node designed to track environmental conditions in real time. At the heart of the system is the MQ-135 analog air-quality and gas sensor, which reacts to various gases in the surrounding atmosphere by changing its electrical resistance. This shift produces a variable analog output voltage proportional to the concentration of target gases present. The WeMos D1 or WeMos D1 Mini board, powered by an onboard microcontroller with integrated Wi-Fi capabilities, continuously reads this analog voltage level via its analog-to-digital converter (ADC) pin. Utilizing the Arduino IDE for programming, the firmware processes the raw sensor data and connects to local wireless networks using the WeMos D1's Wi-Fi module. Once connected, the system interfaces with the Blynk IoT cloud platform. If the processed gas concentration or air quality index exceeds a predefined threshold, the Blynk platform automatically triggers remote notifications, sending alerts directly to an Android smartphone and designated email addresses. Power for the entire assembly is supplied via a standard USB cable, which also serves as the data interface for uploading code from the computer during the initial setup phase.

Why Build This

Develop practical competencies in IoT system design by linking physical analog sensors to cloud-based notification dashboards suitable for undergraduate engineering portfolios.

Monitor indoor environmental conditions and implement early-warning automation for gas leaks in laboratories, residential spaces, or small-scale workspaces.

Gain hands-on experience calibrating analog environmental sensors and handling wireless data transmission protocols using microcontroller hardware.

Real-World Application

Home safety gas leakage detection, indoor air quality monitoring in offices, and industrial environmental tracking.

Skills You'll Learn

Analog sensor interfacing

microcontroller programming

Wi-Fi network configuration

cloud IoT dashboard integration

threshold-based alert automation

Safety Precautions

Ensure proper wiring when connecting gas sensors to avoid short circuits; use caution when testing with combustible gases.

Technology Tags

IOT

BLYNK

WI-FI

MQ-135

AIR QUALITY MONITORING

GAS LEAKAGE

NOTIFICATIONS

SMARTPHONE

ARDUINO IDE

Frequently Asked Questions

Can I use any microcontroller board, or does it have to be a WeMos D1?

The project specifically relies on the Wi-Fi capabilities of the WeMos D1 or WeMos D1 Mini board to communicate with the Blynk cloud platform, so a standard board without built-in Wi-Fi would require additional components.

How do I receive alerts on my Android smartphone and email?

Alerts are managed through the Blynk IoT App, which features built-in notification widgets that can be programmed to push alerts to your smartphone and trigger email dispatches when sensor thresholds are crossed.

Do I need an external power supply, or is USB enough?

A standard USB cable connected to a computer or USB wall adapter provides sufficient power for both programming the WeMos D1 and running the MQ-135 sensor during normal operation.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-00387