When reed switch is opened, pin 2 of Arduino goes high with the help of the pull-up resistor R2, and the alert signal is available through the piezo-speaker PZ1 (not an active piezo-buzzer). At the ...

The Reed Switch Module project demonstrates how to detect the presence of a magnetic field using a reed switch with an Arduino Mega. When a magnet is close to the reed switch, it closes the circuit, ...

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 ...