
Arduino MKR Relay Proto Shield
Overview
The MKR Relay Protoshield allows you to easily add relays to your MKR board based project.
The shield provides two relays (Datasheet) called RELAY1 and RELAY2 commanded by pin 1 and pin 2 respectively.
The shield also provides an easy connection by means of screw terminal blocks to A1 to A4 analog inputs, I2C and supply voltages.
- Operating voltage 3.3V (supplied from the host board)
- Two relays with NO, COM and NC connections
- Works with battery powered board
- 8 positions screw terminal blocks for easy connections with A1 to A4 Analog input, SCL SDA for I2C, GND and 3.3V output
- 6 positions screw terminal blocks (NO, COM, NC for each relay)
- Carry current: 2 A
- Max. operating voltage: 24 VAC, 50 VDC
- Max. operating current: 1 A
- Max. switching capacity: 62.50 VA, 30W
- Proto area
You can find here your board warranty information.
Need Help?
- On the Software on the Forum
- On Projects on the Forum
- On the Product itself through our Customer Support
Conformities
Resources for Safety and Products
Manufacturer Information
The production information includes the address and related details of the product manufacturer.
Arduino S.r.l.
Via Andrea Appiani, 25
Monza, MB, IT, 20900
https://www.arduino.cc/
Responsible Person in the EU
An EU-based economic operator who ensures the product's compliance with the required regulations.
Arduino S.r.l.
Via Andrea Appiani, 25
Monza, MB, IT, 20900
Phone: +39 0113157477
Email: support@arduino.cc
Documentation
OSH: Schematics
MKR Relay Proto Shield is open-source hardware! You can build your own board using the following files:
Learn more
Get Inspired
Arduino based bicycle movement sensor and GPS tracker.

… magnetic reed switch, but building the game himself in Unity. He had to construct and animate models for himself, the bike, and the scenery. After adding an AI and ranking system to the game, he was able to successfully race within the virtual environment on a real bike. Responsive LED system Motivated by the desire for a more advanced lighting system while on her nighttime bike rides, Natasha (TechnoChic) decided to affix strips of NeoPixel LEDs all over her bike that could react to music in real-time. The LEDs are controlled by an Arduino Nano 33 IoT that is, in turn, connected to her boombox via a 3.5mm audio jack for reading the audio signal. Two additional Nano 33 IoT boards were used for the wheels, along with more NeoPixels and batteries for each. GPS tracker Bicycle theft has been rapidly increasing over the last couple of years, which is why being able to recover a stolen bike has become vital. Johan’s bike tracker project contains an Arduino MKR GSM 1400 which reads motion data from an IMU and uses it to determine if the bike has moved when it is not supposed to. Once movement is detected, the board reads GPS data from a MKR GPS Shield and sends it over an LTE data connection in real-time so that the bike can be found. Integrated safety features The majority of mountain bikes lack useful safety features such as integrated lights, turn signals, and speed tracking, which is why Collin Wentzien embarked on his “(not so) electric bike” project. He built a series of features, including automatic brake/turn lights, a headlight, and an electronic horn with the goal of improving safety. Furthermore, his bike also got a bike computer upgrade which contains an Arduino Mega, GPS module, and dual screens for displaying relevant telemetry data. Speedometer display After losing the display unit for her bike computer, Element14 Presents host Katie wanted to replace it with a DIY version that tracked the current speed