bigtreetech / bigtreetech/EBB

SB2240 Thermocouple issue

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Description

Can anyone help me figure out why my EBB2240 is displaying -93 degrees for my Hotend temp? Im using a Rapido hotend and i think its Pt1000. I have tried using these settings
sensor_type:MAX31865
sensor_pin: EBBCan: PA4
spi_bus: spi1
rtd_nominal_r: 1000
rtd_reference_r: 430
rtd_num_of_wires: 2
If i try the setting below I get thermal couple issue.
sensor_type: ATC Semitec 104NT-4-R025H42G
sensor_pin: EBBCan: PA3
control: pid
i get -93 degrees.
im connected 2 wires to the four pin connector and the jumpers are PT1000 1-on 2-on 3-off 4-on
please help. i even replaced this board and it still dont work.
tkostansek — Today at 10:00 AM
MCU 'EBBCan' shutdown: Thermocouple reader fault
Once the underlying issue is corrected, use the
"FIRMWARE_RESTART" command to reset the firmware, reload the
config, and restart the host software.
Printer is shutdown

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Research direction

Start with the EBB2240 sensor configuration in the issue, checking the MAX31865 and ATC Semitec alternatives against the stated two-wire connection and jumper positions. Reproduce the -93° reading and thermocouple reader fault; the issue is done when the selected configuration reports a plausible hotend temperature without shutting down.

Written by the indexing model from the issue text.

Assessment

Domain
embedded-iot
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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