---
title: "TRMNL"
description: "TRMNL is a built-in integration for Home Assistant. It has 397 installs sharing analytics and needs the vendor's cloud."
canonical: "https://vulpo.app/integrations/core/trmnl"
url: "https://vulpo.app/integrations/core/trmnl.md"
last-updated: "2026-10-22"
version: "1.4"
---

# TRMNL

> TRMNL is a built-in integration for Home Assistant. It has 397 installs sharing analytics and needs the vendor's cloud.

TRMNL is a built-in Home Assistant integration that connects TRMNL devices through the vendor's cloud. It adds sensors for battery voltage and Wi-Fi strength, a switch for sleep mode, and two time entities for when sleep starts and ends. Setup happens in the UI and asks for the API key of a TRMNL account. New devices appear without setting the integration up again, and devices that no longer exist are removed automatically. Connection settings can be changed later without removing the integration, and a diagnostics file can be downloaded for bug reports.

Automatic summary of Home Assistant's source code. Something wrong? [Get in touch](https://vulpo.app/contact)

[Open in My Home Assistant](https://my.home-assistant.io/redirect/config_flow_start/?domain=trmnl)

## Supports

- **Uses the vendor's cloud**: Needs an internet connection and an account with the vendor.
- **Set up in the UI**: Add it in Settings, Devices and services. Nothing to download.
- **Adds new devices**: New devices show up without setting it up again.
- **Cleans up devices**: Devices that are gone are removed by themselves.
- **Change settings later**: Its connection settings can change without removing it.
- **Platinum quality**: Home Assistant's own rating of its code and setup experience.
- **Updated with Home Assistant**: Ships and updates with every Home Assistant release.

## Setting it up

It is added under Settings, Devices and services, with Add integration.

### Connect

- **API key**: The API key for your TRMNL account.

Texts from Home Assistant's source code, [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0).

## Entities

- **Sensors**: Battery voltage, Wi-Fi strength
- **Switches**: Sleep mode
- **Times**: Sleep end time, Sleep start time

## Troubleshooting

- **Diagnostics**: Downloads a diagnostics file to attach to a bug report.

## At a glance

- Kind: Built-in integration
- Category: [Computers and network](https://vulpo.app/integrations/category/computers-and-network.md)
- Number: 397 installs sharing analytics
- Connection: Needs the vendor's cloud
- Upkeep: Part of Home Assistant
- Needs: Built into Home Assistant
- Quality scale: Platinum quality scale
- Domain: `trmnl`
- Source: <https://www.home-assistant.io/integrations/trmnl/>

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Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation. [About these numbers](https://vulpo.app/integrations/about)

Last updated 2026-10-22. Source: https://vulpo.app/integrations/core/trmnl

---

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