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 ...

Reed switches are interesting devices with a ton of domestic and industrial applications. We call them switches, but they’re also sensors.

Introduction This project integrates a reed switch with an Arduino Uno using interrupts to detect changes in the magnetic field. The Arduino Uno monitors the state of the reed switch and controls an ...