Load Cell / Scale Integration for Auto Weight #41

New Issue

tonym · 2026-01-16T05:11:12Z

tonym commented

2026-01-16 05:11:12 +00:00

Summary

Integrate with load cell/scale hardware to automatically read spool weight.

Upstream Issue

https://github.com/Donkie/Spoolman/issues/287

Concept

HX711-based load cell reads current spool weight. Subtract empty spool weight = remaining filament.

Reference Projects

Filament-Scale-Enhanced - OctoPrint plugin

Implementation Options

Option A: External ESP32/Device

Dedicated scale device with WiFi
Calls Spoolman API to update weight
Cleanest separation of concerns
Works with any Spoolman host

Option B: GPIO on Pi (if Spoolman runs on Pi)

Direct HX711 connection
Requires Spoolman to run on Pi with GPIO
Less flexible

Option C: Webhook/API Endpoint

Spoolman provides endpoint: POST /api/v1/spool/{id}/weight
External scale device calls it
Most flexible - works with any scale hardware

Recommendation

Option C - just provide API endpoint. Let external projects handle hardware.

Maybe part of #37 (Plugin System) as a scale plugin.

#37 Plugin System
#24 NFC/RFID (hardware integration)

## Summary Integrate with load cell/scale hardware to automatically read spool weight. ## Upstream Issue - https://github.com/Donkie/Spoolman/issues/287 ## Concept HX711-based load cell reads current spool weight. Subtract empty spool weight = remaining filament. ## Reference Projects - [Filament-Scale-Enhanced](https://github.com/techman83/Filament-Scale-Enhanced) - OctoPrint plugin ## Implementation Options ### Option A: External ESP32/Device - Dedicated scale device with WiFi - Calls Spoolman API to update weight - Cleanest separation of concerns - Works with any Spoolman host ### Option B: GPIO on Pi (if Spoolman runs on Pi) - Direct HX711 connection - Requires Spoolman to run on Pi with GPIO - Less flexible ### Option C: Webhook/API Endpoint - Spoolman provides endpoint: POST /api/v1/spool/{id}/weight - External scale device calls it - Most flexible - works with any scale hardware ## Recommendation Option C - just provide API endpoint. Let external projects handle hardware. Maybe part of #37 (Plugin System) as a scale plugin. ## Related - #37 Plugin System - #24 NFC/RFID (hardware integration)

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Reference: tonym/spoolman2#41