The alarm activates in ten seconds once pressing the A button. For police work objects it uses associate unhearable sensing element, and once the alarm detects one thing a buzzer starts emitting a ...

This is a basic fire alarm system built using an LM35 temperature sensor, LEDs, and a buzzer, all connected to an Arduino Uno. The system triggers an alarm when a high temperature is detected. Red ...

Here is a simple general-purpose security alarm circuit built on the Arduino platform. It brings up an obtrusive alert signal when an intrusion/theft attempt is observed by its front-end sensor. In ...