Introduction: Arduino - Magnetic Reed Switch KY-021

Hello world! yep yep, i made another simple example project.

This time for the KY-021 Mini reed switch.

It will simply turn on and off a light with a relay by using a magnetic field.

Reed switches are used allot in burglar alarms.

Follow the next step for the Schematic Code & Parts List.

Step 1: Schematic Code & Parts List.

Parts List

  1. Arduino Uno, I used the robotdyn Uno.. one with 7 analog pins! Very good stuff! buy it!
  2. KY-021 Mini reed Switch
  3. KY-019 1 Channel Relay.
  4. A magnetic field, can be any magnet but best to use is a small one. Or even better a magnet from a alarm.
  5. Set of jumper wires. MM/FF/MF
  6. Lamp + power cable (optional) dont need this! The relay itself will show you if it works by turning on a led.

Good luck!

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Bio: Hello world! I make simple & Advanced projects for people who want to learn programming and electronics. Most of my Instructables are about arduino and the ... More »
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