# Example project using Arduino Nano Matter, Modulino Thermo and Latch Relay publishing temperature and humidity to Matter with optional relay control

**URL:** <https://forum.arduino.cc/t/example-project-using-arduino-nano-matter-modulino-thermo-and-latch-relay-publishing-temperature-and-humidity-to-matter-with-optional-relay-control/1434996>\
**Category:** Nano Matter\
**Created:** [March 12, 2026, 6:43pm UTC](https://forum.arduino.cc/t/example-project-using-arduino-nano-matter-modulino-thermo-and-latch-relay-publishing-temperature-and-humidity-to-matter-with-optional-relay-control/1434996 "2026-03-12T18:43:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wshatford](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/wshatford/32/1126593_2.png) [@wshatford](https://forum.arduino.cc/u/wshatford)\
**Post date:** [March 12, 2026, 6:43pm UTC](https://forum.arduino.cc/t/example-project-using-arduino-nano-matter-modulino-thermo-and-latch-relay-publishing-temperature-and-humidity-to-matter-with-optional-relay-control/1434996/1 "2026-03-12T18:43:16Z")

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Hi everyone,

I created a working example using the Arduino Nano Matter with Modulino modules.

Hardware used:  
• Arduino Nano Matter  
• Nano Connector Carrier  
• Modulino Thermo  
• Modulino Latch Relay (optional)

The sketch publishes temperature and humidity to Matter and can optionally  
control a relay based on a temperature threshold.

Full project and sketch available on GitHub:

> **[GitHub - wshatford/nano-matter-modulino-thermo-relay: Arduino Nano Matter example using Modulino Thermo...](https://github.com/wshatford/nano-matter-modulino-thermo-relay)**
>
> Arduino Nano Matter example using Modulino Thermo and Latch Relay with Google Home (Matter) integration.

Features:  
• Matter temperature sensor  
• Matter humidity sensor  
• Optional thermostat-style relay control  
• Reduced Matter traffic (values are only published when they change)

Notes from development:  
• Modulino.begin() must be called before accessing modules  
• Some Matter examples reuse the same device ID, so a previously  
commissioned board may need to be decommissioned before uploading  
a new sketch  
• Google Home displays humidity as integer percentages

Hopefully this helps others getting started with the Nano Matter + Modulino ecosystem.

Feedback or improvements welcome!

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [September 8, 2026, 6:44pm UTC](https://forum.arduino.cc/t/example-project-using-arduino-nano-matter-modulino-thermo-and-latch-relay-publishing-temperature-and-humidity-to-matter-with-optional-relay-control/1434996/2 "2026-09-08T18:44:00Z")

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