Future‑proof the thermostat you love

On October 25, 2025, Nest Thermostats of the 1st and 2nd generation will no longer be supported by Google. Nest and Google Home app access will stop working.

Sett is an open-source, enclosure-compatible version of the 2nd gen Nest thermostat. It reuses the enclosure, encoder ring, display, and mounts of the Nest but replaces the "thinking" part with open-source PCBs that interact with Home Assistant and other local-first home automation setups.

Pre-orders will be available soon - in the meantime, subscribe to support the project and get blog posts about development progress.

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Sett Open-Source Home Thermostat

$147.00 USD
$147.00 USD
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Blog and Current Progress

  • Reverse-Engineering the LCD Display Interface of the Nest 2nd Gen Thermostat

    Reverse-Engineering the LCD Display Interface o...

    I reverse-engineered the Nest 2nd‑gen thermostat’s circular 320×320 LCD (TM025ZDZ01), built a 41‑pin 0.3 mm FPC breakout, and drove it over 3‑wire 9‑bit SPI with an ESP32‑C6 using Toit—covering the initialization...

    Reverse-Engineering the LCD Display Interface o...

    I reverse-engineered the Nest 2nd‑gen thermostat’s circular 320×320 LCD (TM025ZDZ01), built a 41‑pin 0.3 mm FPC breakout, and drove it over 3‑wire 9‑bit SPI with an ESP32‑C6 using Toit—covering the initialization...

  • Motivation and Early Research

    Motivation and Early Research

    Frustrated by the complex setup, persistent bugs, and Google's looming end-of-life date for the 2nd Generation Nest thermostat, I decided to take matters into my own hands. An iFixit teardown...

    Motivation and Early Research

    Frustrated by the complex setup, persistent bugs, and Google's looming end-of-life date for the 2nd Generation Nest thermostat, I decided to take matters into my own hands. An iFixit teardown...

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