Grove Dry Reed Relay

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.

Features

• Grove Interface

• High Speed

• Good stability

• Long contact life

• Contact fully sealed

!!!Tip More details about Grove modules please refer to Grove System

Specifications

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

Usage

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.

3.Connection

• 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 grove_relay.py   # "Ctrl+x" to exit #

  import time
  import grovepi
  
  # Connect the Grove Relay to digital port D4
  # SIG,NC,VCC,GND
  relay = 4
  
  grovepi.pinMode(relay,"OUTPUT")
  
  while True:
      try:
          # switch on for 5 seconds
          grovepi.digitalWrite(relay,1)
          print "on"
          time.sleep(5)
  
          # switch off for 5 seconds
          grovepi.digitalWrite(relay,0)
          print "off"
          time.sleep(5)
  
      except KeyboardInterrupt:
          grovepi.digitalWrite(relay,0)
          break
      except IOError:
          print "Error"

5.Run the demo.

    sudo python grove_relay.py

Resources

• Grove - Dry-Reed Relay Eagle File
• Dry-Reed Relay Datasheet