Sabec, the studio that turned Nintendo Switch into a scientific calculator, is back at it with another pretty ridiculous app for the console. Spy Alarm creates an invisible beam using the infrared ...

Here is an ultra simple automatic light switch circuit for bedrooms. After construction, connect the input terminals of this circuit in parallel to the internal buzzer terminals of a Quartz-Alarm ...

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 ...