# HT2000Lib: reconstructing an HT2000 logger's USB HID interface

> HT2000Lib implements a C# client for the HT2000 CO2 logger using a USB HID interface recovered by monitoring the manufacturer's Windows application at runtime. It documents status and historical log reports; the author reports that its native Windows backend reads current sensor state and dumps stored measurements.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/gsuberland/HT2000Lib>
- Primary source: <https://github.com/gsuberland/HT2000Lib/blob/568baa5309525b2e8f35357f9fa48763f958b6cd/README.md>
- Catalog page: <https://awesomerea.org/resources/ht2000lib-case/>
- Record JSON: <https://awesomerea.org/resources/ht2000lib-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/ht2000lib-case/index.md)

## Requirements & limits

- **Prerequisites:** An HT2000 USB CO2 logger.
- **Limits:** The author reports that the working native implementation requires Windows; the Device.NET and LibUsb manager variants did not work in the author's tests.
- **Limits:** The logging interval cannot currently be read from the device.
- **License:** MIT license.

## Primary sources

1. <https://github.com/gsuberland/HT2000Lib/blob/568baa5309525b2e8f35357f9fa48763f958b6cd/README.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.