Setup PT100 w/ SKR Mini e3 v1.2 (V0)

Written By: nomsplease (and one other contributor)
  • Comments: 2
  • Favorites: 1
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Difficulty

Moderate

Steps

5

Time Required

00:30:00

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User-Contributed Guide

User-Contributed Guide

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Quiz

0

  1. Pt100: Any two wire pt100 thermistor will do, including ones from e3d and Trianglelab

    • Pt100: Any two wire pt100 thermistor will do, including ones from e3d and Trianglelab

    • MAX31865 Board: You will need a Adafruit (or clone) MAX31865 amp board. You can buy the original here, or just search for a cheaper clone.

    • Dupont Jumper Cables: We will need 6 of them

    Edit

  2. Solder the pin header & the terminal blocks (obvious enough)

    • Solder the pin header & the terminal blocks (obvious enough)

    • Bridge the pads marked with 2 wire (shown in picture) with solder.

    Edit

  3. Wire the PT100 wires into the center terminals (Picture 1) Wire VIN to 5V and GND to Ground. Any free 5V and Gnd will do, this guide will use the SPI header for cleaner wiring. (Picture 2)

    • Wire the PT100 wires into the center terminals (Picture 1)

    • Wire VIN to 5V and GND to Ground. Any free 5V and Gnd will do, this guide will use the SPI header for cleaner wiring. (Picture 2)

    Edit

  4. This is the most confusing step, triple check to make sure you have the wires in the correct places. We will be taking MISO, MOSI, and SCK from the SPI1 header. CS will be taken from the TFT header. (Image 1)

    • This is the most confusing step, triple check to make sure you have the wires in the correct places.

    • We will be taking MISO, MOSI, and SCK from the SPI1 header. CS will be taken from the TFT header. (Image 1)

    • Pin Mapping

    • SKR > MAX31865

    • MISO > SDO

    • SCK>CLK

    • MOSI>SDI

    • RX0 (TFT Header)>CS

    Edit

  5. Edit your printer.cfg file. You can SSH into your RPi and use nano to edit (tutorial)

    • Edit your printer.cfg file. You can SSH into your RPi and use nano to edit (tutorial)

    • Under [extruder] insert these lines

    • sensor_type: MAX31865 sensor_pin: PA3 #CS On RX0 (TFT Header) spi_software_sclk_pin: PA5 #SCK on SPI1 spi_software_mosi_pin: PA7 #MOSI on SPI1 spi_software_miso_pin: PA6 #MISO on SPI1 rtd_nominal_r: 100 rtd_reference_r: 430 rtd_num_of_wires: 2

    • Save your changes by typing CTRL+X, Y, [ENTER]. Send FIRMWARE_RESTART from the console in Octoprint and test! It should work.

    Edit
Finish Line

One other person completed this guide.

Author

with 1 other contributor

nomsplease

Member since: 7/1/20

41 Reputation

1 Guide authored

2 Comments

Very good description but I get an error.

I do all what you explain in your description the error is:

Klipper meldet: ERROR

mcu 'mcu': Unable to connect Once the underlying issue is corrected, use the "FIRMWARE_RESTART" command to reset the firmware, reload the config, and restart the host software. Error configuring printer

whats the problem if you know an issue pls contact me!!!

if needed i can send you my klippy log

Thanks

Best Regards

Gordon Lehmann

Gordon Lehmann - Resolved on Release Reply

Great write up, great photos - Perfect & Super useful.

This saved me ton of figuring out the SPI mapping (even if clear after seeing it). Much appreciated.

Matthew - Resolved on Release Reply

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