grabowski
488c9a399c
lamp_export.py writes the per-lamp bundle consumed by the buildfor.life comparison pages: spd.csv (full 380-1050 nm spectrum), tm30.csv (ANSI/IES TM-30-18 hue-bin data for the color vector graphic), and metrics.json (photometric, colorimetric, CRI R1-R15, TM-30 Rf/Rg, electrical, supply settings). - tm30.py computes TM-30-18 via colour-science from the measured spectrum, resampled to a uniform 1 nm grid; validated against CIE FL2 (Rf 70, Rg 86) - Optional built-in PSU control (--mode/--voltage/--frequency/--current), switched on for the measurement and off afterwards, with --settle warm-up and --interval between readings - Readings use the vendor single-shot cycle verified from USB captures: test config -> trigger (8C 0E 02) -> poll -> read -> reset per reading - Also supports --passive and --parse <pcap> sources
132 lines
4.3 KiB
Markdown
132 lines
4.3 KiB
Markdown
# HPCS 6500 — Open-Source Driver
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Python driver and CLI for the HPCS 6500 spectrophotometer / integrating sphere.
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Communicates directly with the instrument over USB serial, replacing the
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vendor software for measurement automation and data extraction.
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## What This Does
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- **Measure**: Luminous flux (lm), CCT (K), CRI (Ra, R1-R15), chromaticity
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(CIE xy, uv, u'v'), radiometric flux, spectrum 380-1050 nm
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- **Electrical**: Voltage, current, power, power factor, frequency
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- **Harmonics**: 50-harmonic voltage/current analysis, UThd, AThd, waveforms
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- **Power supply**: Control the built-in AC (100-240V, 50/60Hz) and DC
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(1-60V, 0-5A) power supply
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- **Export**: CSV output for data logging
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- **TM-30**: ANSI/IES TM-30-18 Rf, Rg, and hue-bin data computed from the
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measured spectrum (via colour-science)
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- **Lamp bundles**: one-command export of spectrum + TM-30 + metrics for the
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[buildfor.life lamp comparison](https://buildfor.life/comparisons)
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## Quick Start
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```bash
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# Install
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uv sync
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# Single measurement (auto-detects device, turns PSU on/off)
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uv run hpcs6500.py
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# Continuous measurements
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uv run hpcs6500.py --continuous
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# Quick test (lumen + CCT only)
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uv run hpcs6500.py --quick
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uv run hpcs6500.py --quick --continuous
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# Show full spectrum + harmonics
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uv run hpcs6500.py --spectrum --harmonics
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# Save to CSV
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uv run hpcs6500.py --continuous --csv output.csv
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```
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## Power Supply Control
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```bash
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# Read current PSU settings
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uv run hpcs6500.py --psu-status
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# Set AC mode, 230V 50Hz
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uv run hpcs6500.py --mode ac --voltage 230 --frequency 50
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# Set DC mode, 12V with 1A current limit
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uv run hpcs6500.py --mode dc --voltage 12 --current 1.0
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# Manual PSU on/off
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uv run hpcs6500.py --psu-on
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uv run hpcs6500.py --psu-off
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# Set integration time (ms)
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uv run hpcs6500.py --integration 500
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```
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## Lamp Comparison Export
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Produces the per-lamp data bundle consumed by the buildfor.life comparison
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pages: `spd.csv` (full 380-1050 nm spectrum), `tm30.csv` (TM-30-18 hue-bin
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data for the color vector graphic), and `metrics.json` (photometric,
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colorimetric, CRI R1-R15, TM-30 Rf/Rg, electrical).
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```bash
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# Single reading from the device
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uv run lamp_export.py --name philips-a60-8w --manufacturer Philips --model "A60 8W 927"
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# Average several readings
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uv run lamp_export.py --name philips-a60-8w --readings 5
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# Power the lamp from the built-in supply: 230 V / 50 Hz, 60 s warm-up,
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# PSU switches on before the readings and off afterwards
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uv run lamp_export.py --name philips-a60-8w --voltage 230 --frequency 50 --settle 60
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# From an existing pcap capture
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uv run lamp_export.py --name some-lamp --parse captures/run.pcap
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```
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Output lands in `lamps/<name>/`. TM-30 is computed from the measured spectrum
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with [colour-science](https://www.colour-science.org/); the spectrum is
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relative, which TM-30 is invariant to. Sanity check of the implementation:
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`uv run tm30.py` reproduces the published values for the CIE FL2 illuminant
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(Rf 70, Rg 86).
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## Offline Parsing
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Parse previously captured USB traffic (pcap files from USBPcap):
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```bash
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uv run hpcs6500.py --parse captures/some_capture.pcap
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uv run hpcs6500.py --parse captures/some_capture.pcap --quick
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```
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## Files
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| File | Description |
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| `hpcs6500.py` | Driver class (`HPCS6500`) and CLI |
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| `lamp_export.py` | Lamp comparison bundle export (spd/tm30/metrics) |
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| `tm30.py` | ANSI/IES TM-30-18 computation from a spectrum |
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| `usb_capture.py` | USB traffic capture tool (requires USBPcap) |
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| `PROTOCOL.md` | Complete protocol reference (byte-level) |
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| `pyproject.toml` | Project metadata and dependencies |
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## Hardware
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- **Device**: HPCS 6500 spectrophotometer / integrating sphere
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- **USB**: STM32 Virtual COM Port (VID `0483`, PID `5741`)
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- **Protocol**: Custom binary over serial, documented in [PROTOCOL.md](PROTOCOL.md)
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## Dependencies
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- Python 3.11+
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- `pyserial` (serial communication)
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- `colour-science` (TM-30 computation)
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- USBPcap (only for `usb_capture.py`, not needed for normal operation)
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## Protocol
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The binary protocol is fully documented in [PROTOCOL.md](PROTOCOL.md),
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including all command bytes, data block layouts, field offsets, and the
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complete measurement sequence. This was reverse-engineered from USB
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packet captures of the vendor software.
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