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Arduino Mega 2560 Project 29: Reed Switch Module

Posted by Fiona Su on

Reed Switch is a special switch and a main component for reed relay and proximity switch. Reed switch is usually comprised of two soft magnetic material and metal reed contacts which will disconnect itself when there is no magnetic. In addition, some reed switches are also equipped with another reed acting as the third normally-closed contact. These reed contacts are encapsulated in a glass tube full of inert gases(such as nitrogen and helium) or in a vacuum glass tube. The reeds encapsulated in the glass tube are placed in parallel with ends overlapped. Certain amount of space or mutual contaction will be reserved so as to constitute the normally-open or normally-closed contacts of the switch.
Reed switch can be used as sensor for count, limit and other purposes. For instance, a kind of bike-kilometer is constituted by sticking magnetic to the tire and mounting reed switch aside. We can mount reed switch on the door for alarming purpose or as switches.
Reed switch has been widely applied in household appliances, cars, communication, industry, healthcare and security areas. Furthermore, it can also be applied to other sensors and electric devices such as liquidometer, door magnet, reed relay, oil level sensor and proximity sensor(magnetic sensor). It can be used under high-risk environment.

  • Working voltage: DC 3.3V-5V
  • Working current: ≥20mA
  • Working temperature: -10℃—+50℃
  • Detection distance: ≤10mm
  • IO Interface: 3 wire interface (-/+/S)
  • Size: 30*20mm
  • Weight: 3g

Connection Diagram:


Sample Code:

int Led=13;//define LED interface
int buttonpin=3; //define magnetic ring sensor interface
int val;//define digital variable val
void setup()
pinMode(Led,OUTPUT);//define LED as output interface
pinMode(buttonpin,INPUT);//define magnetic ring sensor as output interface 
void loop()
val=digitalRead(buttonpin);// read and assign the value of digital interface 3 to val 
if(val==HIGH)//When a signal is detected by magnetic ring sensor, LED will flash

Project List

Buy it here>>Sensor Starter Kit For Arduino Mega 2560


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