// Pin Definitions #define MQ2PIN A0 // MQ-2 analog output to Analog Pin A0 #define BUZZER 8 // Buzzer connected to Digital Pin 8 #define LED 9 // LED connected to Digital Pin 9 // Smoke detection ...

The Arduino Smoke Detector, a wireless device that sends text messages and automated phone calls to users when a smoke sensor is triggered, won the Hacker's Choice Award at last weekend's ...

Let me introduce another simple microcontroller-based do-it-yourself circuit that detects motion and excites a light source in a flash. The “snooper” here is an ordinary passive infrared (PIR) motion ...

One of the highest-volume products used in homes, commercial buildings, and factories is the smoke detector. Smoke detectors are mandated by government everywhere, so almost everyone has one.

If you want to get rich by hunting with a metal detector, you might want to consider how much you invested in the hardware to start with. Finding a tin can with a $200 detector might not make economic ...