Onion Omega2 Dash

by Onion

An open-source touchscreen & Wi-Fi-connected Linux dev board

View all updates Nov 24, 2020

Field Report: Simple Circuit Management with Onion Omega2 Dash

by Mariusz Duka

This simple project shows how you can use the Omega2 Dash and Omega2 Pro to manage an external electrical circuit via a secure user interface. While simple, it’s a good example of the capabilities of the Omega ecosystem and can serve as the basis for building much larger and more complex projects.

The project software is written in Python and Micropython using the LittleV graphics library. Hardware-wise, the Omega2 Pro is equipped with the RFID and NFC relay extensions. In all, I used the following hardware:

  • Omega2 Dash
  • Omega2(+) plugged into Extension Dock or Omega2 Pro
  • RFID & NFC Extension (optional)
  • Relay Extension (optional)
  • DS18B20 temperature sensor
  • 1x LED
  • 1x 220Ω, 1x 5.1kΩ Resistor
  • 5x Jumper wires (M-M)

The Omega2 Pro reads the temperature value from the sensor and, using the Relay Extension module, switches the voltage in the circuit. The Omega2 Dash communicates with the Omega2 Pro using socket connections to provide user feedback and a UI.

You can learn all about the project, including code samples and step-by-step construction and configuration details at the project repo.

About the Author

Mariusz Duka

MariuszDuka  ·  mariuszduka  ·   Riga, Latvia

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Product Choices


Omega2 Dash

An Omega2 Dash IoT computer. Perfect for making internet-connected control panels and user interfaces.


Ethernet Expansion

From the Onion Omega2 Pro project.

An Ethernet Expansion board for your Omega2 Dash

The Ethernet Expansion adds an Ethernet port to your Omega with a maximum connection speed of 100Mbps. While the Omega is all about wireless connectivity, a reliable wired network connection can be a great addition to a project, and the Ethernet Expansion is a great tool for quickly reflashing your Omega’s firmware.


NFC/RFID Expansion

From the Onion Omega2 Pro project.

An NFC/RFID Expansion board for your Omega2 Dash

Bring contact-less RFID and NFC communication to your Omega2. It supports reading and writing with several NFC and RFID protocols at 13.56 MHz. Comes bundled with two programmable Mifare Ultralight tags.


ADC Expansion

From the Onion Omega2 Pro project.

An ADC Expansion board for your Omega2 Dash

Omega2 can now read all types of analog voltages and sensors with the help of this ADC Expansion. Read and interpret up to 4 analog voltage or sensor inputs, each with 16 bits of precision.


Proto Expansion

From the Onion Omega2 Pro project.

A Proto Expansion board for your Omega2 Dash

The Proto Expansion for the Onion Omega allows you to create your very own expansion that interfaces with your Omega. It provides a small soldering area and 30-pin header that plugs into the Expansion Dock. With it you will have full control over what kind of project you design for your Omega.


Servo Expansion

From the Onion Omega2 Pro project.

A Servo Expansion board for your Omega2 Dash

The Servo Expansion adds 16 PWM (Pulse Width Modulation) outputs to your Omega. Connect standard servos directly to the Expansion since each channel has its own 3-pin connectors, making it that much easier to get started with your project! This Expansion is great in any application that requires servos, like a robotics project or anything with moving parts. Given that PWM is so useful, you can also use this Expansion to precisely control LEDs or drive a DC motor using an H-bridge. The Servo Expansion is often also called the PWM Expansion.



Onion is a team of technology enthusiasts, creators, and strivers, looking to make amazing products and even better user experiences. Onion has been in business since 2014, graduating from the TechStars Startup Accelerator in Boston that year. In 2015, we introduced the world to the Onion Omega IoT computer.

Lazar Demin

Zheng Han

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