Eddy Coil USB Adapter

General Discussion
1

Basic Information:

Printer Model: Neptune 4 pro
MCU / Printerboard: V1.1
Host / SBC OpenNeptune4
klippy(1).log (801.1 KB)

So I recently bought the eddy coil as an upgrade, but the coil being much cheaper for some reason (literary 1/2 of the non-coil one)
And my plan was to use like a Raspberry pi pico and a level shifter to adapt it into the usb version
Today i got my order so i threw up some code using some elbow grease and chatgpt
So the code talks to it over i2c and converts the raw data over usb serial, but i get a zero and nothing i do (physically) changes it
So i probably need some initialization but the official docs aren’t very helpful

heres the code:

and heres the output:
Sensor Data: 0
and this repeat every poll
Thanks in advance

2

You shouldn’t need to write your own code for this. Wire the i2c pins to your pico flashed with Klipper, then configure the MCU and the probe.

3

ok, i flashed it with klipper firmware but im struggling with some of the config options, do you have a more beginner friendly guide for that

4

The best I can do is provide BTT’s guide:

It appears much of their sample configuration applies to the USB version. Two things to keep in mind:

  1. The “coil” version doesn’t have a thermistor, so the [temperature_sensor] and [temperature_probe] sections need to be omitted.

  2. As the sample configs state, you need to verify your i2c_bus option in [probe_eddy_current], as it depends on the pins you are using on your Pico. The best way to do this right now is to refer to Klipper’s source.

In these definitions the bus name is in the first parameter, ie: BUS_PINS_{bus name}. The second parameter defines the pins, {sda_pin, scl_pin}.

You can cross reference the pico’s pinout to verify. So for example, bus i2c0a is on pin GP0 and GP1.