This project, inspired by nfc2klipper, uses an inexpensive NFC module and a wifi-capable microcontroller to read spool tags and send the info to your printer. nfc2klipper is nice, but I wanted to avoid running wires all the way from the top of the printer to the electronics bay. By going wifi, I only needed to steal 5V from the MMU, which conveniently is on the top.
Features:
- NFC Tag scanning and sending the info to Moonraker
- Supports a single neopixel or three simple LEDs for status display
Typical Use Case:
- Scan an NFC tag attached to a filament spool
- The microcontroller reads the tag info and send an update to Happy Hare
- Load the spool into your MMU
- Happy Hare now knows which spoolman SpoolID you just loaded and fetches the relevant details, and is ready to update filament usage
| Name | Quantity | Link |
|---|---|---|
| ESPxxxx | 1 | ESP32 (Amazon US) ESP8266 (Amazon US) ESP8266 (Amazon DE) |
| PN532 Reader | 1 | Amazon US Aliexpress |
| LED | 1 | See below |
| A handful of wiring, soldering and crimping supplies |
| Name | Quantity | Link |
|---|---|---|
| WS2812B LED | 1 | Amazon |
| Name | Quantity | Link |
|---|---|---|
| RGB LED or one single-color LED of each | 1 | Amazon US |
| 220Ω Resistor | 3 | Amazon US |
TODO
ESP32 Wiring with WS2812B neopixel
ESP8266 Wiring
TODO
See SETUP.md
You can ampy run test_pn532.py to check for communication with the NFC module.
If you don't see
Found PN532 with firmware version: 1.6
(or other version), the wiring is probably not quite right yet.
This work is licensed as CC-BY-NC-4.0
Thanks to
- @3DCoded for testing, ideas and development assistance
- @nom3rcy. for the idea to use a dedicated microcontroller to avoid long wire runs