Software · Raspberry Pi & electronics

ups-to-esp32

Put a USB-only UPS on the network: an ESP32-S3 board and firmware that serves NUT on TCP 3493, with a web UI. No host computer, no Raspberry Pi.

Completely free
Open source
No account

Overview

ups-to-esp32 is a microcontroller program.

Features described in its GitHub repository: web interface.

Services and protocols mentioned: S3 and Home Assistant.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Put a USB-only UPS on the network: an ESP32-S3 board and firmware that serves NUT on TCP 3493, with a web UI.” — GitHub, 10 November 2026
“Put a USB-only UPS on the network: an ESP32-S3 board and firmware that serves NUT on TCP 3493, with a web UI.” — GitHub, 10 November 2026

At a glance

All of ups-to-esp32 is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No account needed
Commercial use allowed

Sources and checks

Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) — 9 November 2026
Last technical check: 7 November 2026
Description from github.com — Dépôt GitHub aronreid/ups-to-esp32 (GPL-3.0-only)

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