Now it is very easy to build your own siren sound alarm, small enough ... using the renowned Arduino platform. The 9V battery powered circuit produces a loud, wailing sound as a warning signal. As ...

In the microcontroller era today, Arduino is more than just a tool ... is used to measure the light level. The alarm system is triggered when a “Logic High (H)” level signal is detected at its sensor ...

When you think of Arduino ... the red LED lights up, the buzzer beeps and the seven-segment LED display counts up. After making contact ten times, the buzzer blares out an annoying sound ...