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 ...
There are two sensor choices, reed and Hall-effect switches. They have many similarities but also significant differences, explains Martin Reizner. Demand for reed switches has risen significantly in ...
Standex Electronics has created a series of mini magnetic field sensing reed switches, optimised to control up to 10W, 200V or 500mA. Called MK33, they are bare glass surface-mount reed switches with ...
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