Grove - Dry-Reed Relay


3.3V 5.0V Digital

The Grove-Dry Reed Relay is a relay module which works through magnetizing the vibration reed via the current in the coils. Compared to electromagnetic relays, the contacts completely sealed is the biggest feature of the Dry-Reed Relay. Besides, it features simplicity in construct, compactness, fast speed and long life, which make it widely applied in many fields such as microelectronic detection, Automatic Control etc.


  • Grove Interface
  • High Speed
  • Good stability
  • Long contact life
  • Contact fully sealed


More details about Grove modules please refer to Grove System


Item Min Typical Max Unit
Voltage 4.8 5.0 5.2 VDC
Coil Resistance 225 250 275 Ω
Pick-Up Voltage 3.75 VDC
Switching Current(Max) 0.5 A
Switching Voltage(Max) 120 VAC/60VDC -
Carrying Current(Max) 1.0 A
Operate Time(Max) 1.0 mS
Release Time(Max) 0.5 mS
Mechanical Life(at no load) 1×108 operations -
Ambient Temperature -30 / 70 ˚C

Platforms Supported


With Arduino

The Dry-Reed Relay can support up to 60VDC 1A load. You can use it to control resistance load, but it is not applicable to inductive load(such as Motor).

The usage of this Dry-reed relay is quite alike that of common relays.

  • Connect electric light to Grove - Dry-Reed Relay and power for electric light.
  • Connect Grove - Dry-Reed Relay to port D2 of Grove - Base Shield and plug it into Arduino/Seeeduino.

  • Upload the below code.

    int Relay = 2;

    // the setup routine runs once when you press reset:
    void setup() {                
      // initialize the digital pin as an output.
      pinMode(Relay, OUTPUT);     

    // the loop routine runs over and over again forever:
    void loop() {
      digitalWrite(Relay, HIGH);   //the Relay close(HIGH is the voltage level)
      delay(5000);               // wait for five seconds
      digitalWrite(Relay, LOW);    //the Relay normally open by making the voltage LOW
      delay(5000);               // wait for five seconds
  • The electric light will light up for seconds ,then off for seconds, repeatedly.For the special applications, you may need to write the code by yourself.

With Raspberry Pi

1.You should have got a raspberry pi and a grovepi or grovepi+.

2.You should have completed configuring the development enviroment, otherwise follow here.


  • Plug the sensor to grovepi socket D4 by using a grove cable.

4.Navigate to the demos’ directory:

    cd yourpath/GrovePi/Software/Python/
  • To see the code
    nano   # "Ctrl+x" to exit #
    import time
    import grovepi

    # Connect the Grove Relay to digital port D4
    relay = 4


    while True:
            # switch on for 5 seconds
            print "on"

            # switch off for 5 seconds
            print "off"

        except KeyboardInterrupt:
        except IOError:
            print "Error"

5.Run the demo.

    sudo python


ArduinoWioBeagleBoneRaspberry PiLinkIt ONE


The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library.

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Happy hacking