BK Precision 1900 Series Control

A lightweight Python 3.12 library and CLI for controlling BK Precision 1900-series programmable DC power supplies, tested on the BK 1902B. It provides both a Pythonic context-manager interface and a simple command-line tool for automation or lab use.

✨ Features

Safe open/close via context manager
Set and read output voltage/current
Enable or disable output
Query front-panel readings (voltage, current, CV/CC mode)
Command-line interface (bk1902b) for quick manual control

🧰 Installation

From PyPI

pip install bk_precision_1900

From Source

git clone https://github.com/DephyInc/bk_precision_1900.git
cd bk_precision_1900
pip install -e ".[dev]"

🚀 Command-Line Usage

After installation, a console script bk1902b is available.

# Set output voltage to 12.0 V
bk1902b set-voltage --port /dev/ttyUSB0 12.0

# Set output current to 2.0 A
bk1902b set-current --port /dev/ttyUSB0 2.0

# Turn output on / off
bk1902b output --port /dev/ttyUSB0 on
bk1902b output --port /dev/ttyUSB0 off

# Read front-panel display (voltage, current, mode)
bk1902b read-display --port /dev/ttyUSB0
bk1902b read-display --port /dev/ttyUSB0 --json

Replace /dev/ttyUSB0 with your serial port (e.g., COM3 on Windows).

🧑‍💻 Library Usage

import time
from bk_precision_1900.bk1902b import BK1902B

with BK1902B("/dev/ttyUSB0") as psu:
    psu.set_current(0.1)
    psu.set_voltage(5.0)
    psu.enable_output()
    time.sleep(5)
    psu.disable_output()

🧩 Demo Script

A minimal example (bk_precision_1900/bk_demo.py) is included:

python -m bk_precision_1900.bk_demo /dev/ttyUSB0

It cycles voltages between 1 V and 40 V, reads back live measurements, and prints CV/CC status.

🧪 Development

    # Format, lint, and type-check
    ruff format .
    ruff check .
    mypy .

Requirements are managed via pyproject.toml and use Ruff for linting + formatting and Mypy for static type checking.

📝 To Do

Implement full BK 1900 command set (GETS, SOVP, SOCP, etc.)
Query limits instead of hard-coding max values
Add unit tests / mock serial backend
Automate releases (e.g. GitHub Actions)

⚖️ License

MIT License © Dephy Inc. See https://dephyinc.mit-license.org/ for details.

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