TRMNL E-Ink Display Battery for Home Assistant (Marketplace integration)

Installs: 104 sharing analytics
GitHub stars: 21
Connection: Uses the vendor's cloud
Upkeep: Updated in the last 6 months
Version: v1.0.0, June 24, 2026
Category: Computers and network
Kind: Marketplace integration
Needs: Needs the Marketplace (HACS on 2026.10 and older)
Domain: trmnl
Source: github.com/Beat2er/homeassistant-trmnl-battery
Issues: Report an issue

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation.

About

TRMNL E-Ink Display Battery is an integration that reports battery and connection status for TRMNL e-ink devices. For each device it adds sensors for battery voltage, battery percentage, WiFi signal in dBm and percent, and the time the device last contacted the server. Battery percentage uses the value the device reports and, when that is missing, as on some older devices, estimates it from voltage using a LiPo discharge curve. Data comes from TRMNL's cloud Account API, which needs the Developer Edition add-on and an account API key rather than a per-device key. Setup happens in the UI, with optional settings for a custom API server address and a polling interval that defaults to five minutes and cannot go below 60 seconds.

Automatic summary of the README and code of Beat2er/homeassistant-trmnl-battery. Something wrong, or are you the maintainer and want your own text here? Get in touch

Supports

Uses the vendor's cloud Needs an internet connection and an account with the vendor.
From the Marketplace Installed through the Marketplace, formerly HACS.
Actively maintained Its author released or pushed a change in the last six months.

Provides

Sensors

Setting it up

Install it from the Marketplace and restart Home Assistant, then add it under Settings, Devices and services.

TRMNL Setup

API Key
API Base URL (Optional, e.g., https://usetrmnl.com)
Polling Interval - seconds (Optional, min 60)

After setup

API Base URL (e.g., https://usetrmnl.com)
Polling Interval - seconds (min 60)

Texts from the code of Beat2er/homeassistant-trmnl-battery.

From the README

Monitor your TRMNL e-ink display devices from Home Assistant: battery voltage, battery percentage, WiFi signal (dBm and percent), and when the device was last seen.

From the README of Beat2er/homeassistant-trmnl-battery, MIT License. Shortened.