A CLI utility in Go to read weight data from a Stamps.com USB postal scale via HID.
Originally developed to revive old electronics gifted by a family member. This project documents the quirks, bias, and calibration of the device for others interested in low-cost hardware reuse.
---
## Usage
```sh
go build -o scale-code
sudo ./scale-code
```
The program continuously polls the scale and displays the weight in ounces, rounded to the nearest 0.1 oz.
You must run it as root (`sudo`) or use a proper udev rule to grant access to `/dev/hidraw` devices.
---
## Calibration
### Observed Bias:
```
W = Stamps.com scale
WT = Taylor digital scale (Walmart, new)
Test object: consistent, arbitrary small item
W1: 1.9
W2: 1.9
W3: 2.0
WT1: 2.0
WT2: 2.0
WT3: 2.0
```
### Adjustment:
A linear correction factor of `0.952` is applied to compensate for the 0.1 oz low bias, yielding more accurate readings.
