This project aims to monitor indoor air quality using an Arduino Uno microcontroller along with an MQ135 gas sensor, a DHT11 temperature and humidity sensor, and a basic LED indicator. The system is ...

This system uses an Arduino UNO with smoke, flame, and temperature sensors (like MQ, KY-026, and DHT11) to detect early signs of fire. If any sensor detects danger—like smoke, high heat, or flame—a ...

Recently, we published an entry-level Arduino project with a single seven-segment LED display. Although it’s an amazing DIY project, we noted that most of the readers are looking for more advanced ...

A DHT11 monitors the temperature and humidity. A charge circuit and lithium battery provide power. Finally, the watch displays the date, time, and other data with an LCD from a Nokia 5110.