# hpcs330: reconstructing the Hopoo spectrometer serial protocol

> hpcs330 implements a Python reader for the Hopoo HPCS-330 spectrometer using a USB serial protocol recovered from the vendor's Windows application. The protocol notes describe framing and measurement commands; the client retrieves spectral samples and the meter's computed light measurements.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/markchadwick/hpcs330>
- Primary source: <https://github.com/markchadwick/hpcs330/blob/8e5699029d66f12d3a898832bd6892f7a4a5a16e/docs/protocol.md>
- Catalog page: <https://awesomerea.org/resources/hpcs330-case/>
- Record JSON: <https://awesomerea.org/resources/hpcs330-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/hpcs330-case/index.md)

## Requirements & limits

- **Prerequisites:** Python 3.10 or later and pyserial 3.4 or later.
- **Prerequisites:** A Hopoo HPCS-330P in USB COM mode; this is the model the author reports testing.
- **Limits:** Other HPCS-330 variants and HPCS-310/320 models are unconfirmed; some computed values have not been checked against the screen.
- **License:** MIT License.

## Primary sources

1. <https://github.com/markchadwick/hpcs330/blob/8e5699029d66f12d3a898832bd6892f7a4a5a16e/docs/protocol.md>
2. <https://github.com/markchadwick/hpcs330/blob/8e5699029d66f12d3a898832bd6892f7a4a5a16e/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.