In this video, I experiment with creating a window and door alarm using the following materials: a small piece of wood, a mini piezo buzzer, 22 gauge conductor, a battery socket, a 3V battery, an SPDT ...

The YL-333 Magnetic Antitheft Alarm is an easy to install security alarm system for doors and windows. This battery-operated device works on the principle of magnetic proximity detection. It can ...

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Economical circuit of an electronic alarm, notifies you when your door or window is open, is presented here. This circuit wired around the Quad 2-input NAND Schmitt trigger IC 4093 (IC1) can be ...

Eve’s easy-to-install but pricey contact sensor offers powerful automations and works with Thread, but it doesn’t support Alexa or Google Assistant. Eve Systems has been adding more and more ...