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.


Omega2 Dash Essentials Collection

An Omega2 Dash and the Ethernet and ADC Expansions. Build projects that use wireless or wired networking and can communicate with all sorts of devices, digital or analog.


Omega2 Dash Ultimate Collection

An Omega2 Dash and a whole set of Expansions: NFC/RFID Expansion, ADC Expansion, Servo (PWM) Expansion, Ethernet Expansion, Proto 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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