MQ2 Sensor is a gas module and it is suitable to detect Hydrogen, LPG, Smoke, CO, and Alcohol. It has high sensitivity and fast response.
by Junez Riyaz
Learn how to make an Arduino-controlled door lock system that uses a keypad!
Project tutorial by DIY Hacking
An alarm clock using a DS1302 RTC and a buzzer. You can set the RTC by a keypad as well as set the alarm.
Project tutorial by SurtrTech
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