REED click is a simple board that carries a standard (Single Pole Single Throw Normally Open) reed switch. A reed switch comprises of two thin magnetic contacts sealed inside a casing. One contact is a magnetic north pole, the other a south. The two contacts are separate, until a magnetic field is applied which snaps them close, activating the switch. A single mikroBUS pin (CS) connected to the MCU outputting a 1 or 0 depending on the whether the switch is close or open. REED click is designed to use either a 3.3V or a 5V power supply.
Reed switches are widely used in a variety of applications: door sensors, liquid level sensors (by employing magnetic floats and reed sensors along the wall of the container), but also protective casings for phones, tablets, ebook readers etc.
Standard (Single Pole Single Throw Normally Open) reed switch
LED to indicate state of switch. Single pin (CS) interface with MCU