ENVIRONMENT & ENERGY
Air Quality Indicator Model
Display approximate air-quality status using a gas sensor and coloured indicators.
LevelSchool / Intermediate
Duration2–3 Weeks
Components₹1,500–₹2,800 CodingLow
Project overview
Display approximate air-quality status using a gas sensor and coloured indicators.
Display approximate air-quality status using a gas sensor and coloured indicators.
Components / materials required
✓Arduino/ESP32
✓MQ-135 or suitable sensor
✓RGB LED
✓OLED optional
✓Buzzer optional
What the project demonstrates
✓Sensor value display
✓Green/amber/red indicator
✓Threshold alert
Suggested build plan
01
Sensor calibration
Observe baseline readings.
02
Status bands
Define demo thresholds.
03
Indicators
Show colour-coded status.
Learning outcomes
✓Understand environmental sensing
✓Calibrate analog sensors
✓Communicate data with simple indicators
Safety / important note
Educational indicator only; not a certified air-quality instrument.