Grove - Relay


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The Grove-Relay module is a digital normally-open switch. Through it, you can control circuit of high voltage with low voltage, say 5V on the controller. There is an indicator LED on the board, which will light up when the controlled terminals get closed.


  • Parameter v1.1 v1.2
  • Product Release Date 27th Jan 2013 9th June 2014
  • Operating Voltage 5V 3.3V~5V
  • Operating Current 60mA 100mA
  • Relay Life 100,000 Cycle 100,000 Cycle
  • Max Switching Voltage 250VAC/30VDC 250VAC/30VDC
  • Max Switching Current 5A 5A


More details about Grove modules please refer to Grove System

Platform Support

Arduino Wio BeagleBone Raspberry Pi LinkIt
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Getting Started

With Arduino

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Below is a demo that shows you how to control a Grove - Relay with a Grove - Button. When the button gets pressed, the relay will close.

// Project Five - Relay Control

void setup()
  pinMode(1, INPUT);
  pinMode(2, INPUT);
  pinMode(6, OUTPUT);

void loop()
  if (digitalRead(1)==HIGH)
    digitalWrite(6, HIGH);
  if (digitalRead(2)==HIGH)
    digitalWrite(6, LOW);

With TI LaunchPad

Controlling other electronics (Relay)

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This example showcases how to use the Grove-relay module to control larger load, i.e. a desk lamp light. A 3V voltage signal can cause the relay to switch on, allowing current to flow through the connected appliance.

The basic Energia example. 
This example code is in the public domain.

#define RELAY_PIN 39

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

// the loop routine runs over and over again forever:
void loop() {
         digitalWrite(RELAY_PIN, HIGH); // turn the relay on (HIGH is the voltage level)
         delay(1000);   // wait for a second
         digitalWrite(RELAY_PIN, LOW);   // turn the relay o by making the voltage LOW
         delay(1000);   // wait for a second

With Raspberry Pi

This sample is show you how to use Grove - Relay by Raspberry Pi . The demo below will show that the relay be control by Grove -Button.

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# Raspberry Pi + Grove Switch + Grove Relay

import time
import grovepi
# Connect the Grove Switch to digital port D3

switch = 3
# Connect the Grove Relay to digital port D4

relay = 4
while True:
        if grovepi.digitalRead(switch):
    except KeyboardInterrupt:
    except IOError:
        print "Error"

Run the program

  • Find the path to the file(According to your own path) cd GrovePi/Software/Python/
  • Run Program sudo python


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