Onion Omega Compatible I2C Shield with RFID Receiver and USB Interface

  • EM18 RFID Receiver for Onion Omega 2 and 1
  • Compatible with RFID Cards, Tags, Stickers, and Fobs
  • Power & Program your Onion Omega from USB
  • Provides a I2C Expansion Port for Interface to CE Devices
  • Easily Interface Onion Omega to Hundreds of Sensors
  • Use Onion Omega to Control Relays and FETs
  • Interface Onion Omega to Energy Monitoring Devices
  • RFID Card, FOB, Tag, or Sticker Included for Testing


This RFID Receiver for Onion Omega makes it easy to interface RFID cards, fobs, tags, and stickers into your next automation application.

Simply swipe a RFID device across the sensor and read the code into the Onion Omega at 9600 baud.

The OOI2CU includes an integrated I2C port for easy expansion to the entire ControlEverything.com I2C Product Line.

This design includes the popular EM18 RFID receiver, greatly simplifying software development.

This product includes a 1 ft cable for remote mounting of the RFID reader.

Based on availability, we will also include a RFID device for testing (a RFID Card, FOB, Tag, or Sticker).

NOTE: Please make sure the solder jumper is set at 3.3V.

This device makes use of the UART receive line, and should not be used with overlay shields.


Dimensions: 93.00000 x 73.00000 x 15.00000 mm
Mechanical drawing
Wiring diagram