Dymo M25 USB Scale HID Reader

Cross-platform compatible Python 3 script for reading the scale as a human input device (HID).

Requirements

• Python 3
• libusb

Setup

On OS X, install libusb via Homebrew:

$ brew install libusb

Create a local virtual environment for Python:

$ python3 -m venv ./

Install the required Python requirements:

$ pip install -r requirements.txt

Usage

$ python3 dymo.py

The output will confirm successful connection to the scale:

Connected to DYMO M25 25 lb Digital Postal Scale

After placing bananas on the scale:

16 grams
178 grams
234 grams
248 grams
248 grams
248 grams
248 grams
248 grams

After removing them:

286 grams
316 grams
28 grams

Note that the resolution of the Dymo M25 scale is 2 grams (or 0.1oz), and the response time seems to be about 1-2 seconds.

To exit, press ctrl+C or turn off the scale.