SmartMass

Make every gram count!

A smart weighing solution for almost anything, but FDM filament spools in particular.

pre-release quick project overview

Motivation

The almighty YT algorithm suggested a 3D filament weighing solution to me recently, and as I have quite a few "almost empty" filament spools laying around I reached out to the maker. Unfortunately, no part of the suggested solution was open source so I decided to start my own open source solution. From a simple local solution with a tiny OLED display, the scope quickly escalated with (useful?) features such as MQTT read/write or RFID read/write. The planned feature list can be found on the projects page.

As of now, the SmartMass device connects to an MQTT broker via WiFi and posts events to the smartmass/<deviceid> topic. The scale can be configured, calibrated and tared via MQTT using the documented payload in the ./payload folder. It also supports reading (and writing) filament spool metadata on Mifare 1K S50 tags (they're available as stickers!) with an RFID-RC522 module.

BOM (bill of materials)

• a 2kg / 3kg load cell
• an HX711 signal ampifier
• an 0.96" 128x64 OLED display
• an RFID-RC522 module
• an ESP32-WROOM / ESP8266
• PLA / PETG / ... to print the models

Getting started

Broker

1. Set up an MQTT broker (mosquitto, emqx, hive, ...) and create a user for the device

Hardware

TODO

Code:

1. Open the project with platformio, I'm using the platformio plugin in VSCode.
2. copy configuration.h.template to configuration.h and fill in WiFi, MQTT and PIN information
   1. TODO: add detailed guide for options
3. build and upload the code