Reed Switch

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Description

A switch that closes in the presence of a magnetic field. Module outputs the analog sensor signal, as well as (for some modules) a digital signal that is switched high when the sensor level crosses a preset threshold. The threshold is set via the potentiometer.

Also called: magnetic spring switch, mini reed switch, KY025.

Found in kits: 20 sensors, 37 sensors, 45 sensors (larger board).

Found in kits: 37 sensors, 45 sensors (smaller board).

Specification/Notes:

• Voltage: 3.3V to 5.0V
• LED: Power
• Size: 20mm X 60mm

The mini reed switch module includes a 10k ohm resistor for pull-up or pull-down, depending on wiring. Normally open, closed in presence of magnetic field.

There are a number of different sources for these modules. Not every module that looks similar to the ones here behaves exactly the same. Check the specific module that you have for differences in function, voltage levels, pinout, and inactive/active states. Some modules have been found to have incorrectly labeled pins and even poorly soldered components.

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Image: Reed switch schematic. Reed switch represented by button.

Module Pin-out:

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Image: Typical/common pinout. Always check the pinout for the module that you have.

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Image: Typical/common pinout. Always check the pinout for the module that you have.

If you have more information about certain modules, please feel free to Contact us! and share what you know. If you also have test or application code to share, that link is the way to share that - we would appreciate your experiences and input a lot!

If you are interested in purchasing the unique devices that are shown on these pages, CircuitGizmos (link: CircuitGizmosOnline) sells many of these devices. Also Tindie has several of the CircuitGizmos devices for sale.

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Sometimes the 37 sensor projects are described as Instructables. This is the Instructable user to follow: Indestructable and YouTube channel and even follow on Instagram. Link back to us, please! We really like learning how our products are used.

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