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bigtreetech
PT1000/TH0 mislabeling/clarification?
On the circuitboard of the EBB36 v1.2 a 2-pin header left of the center, bottom row of connectors is labeled 'PT1000'. On the wiring/pinout diagram that header is labeled TH0. There's also a header to the far right, bottom row of connectors without any markings on the pcb, right below the bank of microswitches, that's labeled PT100/PT1000 on the diagram.
Can you provide clarification which is to be used for which situation, and the correct pinout for the 4-pin connector? I think the PT1000 labeled 2-pin is for the emulated PT1000 sensor (like on the M5P board), and the unmarked 4-pin for the header that is connected to the MAX31865 chip, but it is not clear at all from the documentation.
Additionally, the pins to be used for a 2-pin sensor via the 4-pin connector are not specified. From other sources on the web I think those need to be connected to the center 2 pins, but it would be nice to get clarification here.
Yep, i just got to that stage today and i've noticed there's no pins described in PT1000 connector...Pretty common with BTT and other china manufacturers manuals/pinouts, so looks like we need to guess
I have it figured out, it's just not very clear. The two pin header marked PT1000 is only necessary if you use the two pin thermistor header TH0 and have a PT1000 sensor connected to it. In that case there's a resistor needed, which you enable by bridging these pins with a jumper. The board then uses a software emulation to estimate the temperatures. It's apparently very inaccurate at low temperatures (according to other sources, and some hints in the manual too). This is explained on page 9 of the EBB36 english manual.
On page 10 of the manual there's a very summary drawing of the wiring of 2 wire and 4 wire PT1000 sensors, when you've got an EBB that has got an MAX31865. Basically: if you have a 2 wire version, wire the mid two pins. Because the drawing had no text next to it whatsoever I missed it on looking for it in the manual before.
@bigtreetech the info is apparently in the doc (as I found it), but it could definitely do with some clarification.
I've already found it too, that i need to use two middle pins, but on diagram available right in their github you can see every connector described with pinout except of pt1000...
So which pin do you use with for 2 wire sensors on the 4-pin connector. eg PA1, etc.. this doesn't seem to be labeled anywhere but must be set in klipper config.
Does anyone know what I'm doing wrong I can get my 2 wire PT1000 to work with with the Max31865 EBB2209
[extruder] step_pin: EBBCan: PD0 dir_pin: !EBBCan: PD1 enable_pin: !EBBCan: PD2 microsteps: 16 rotation_distance: 33.500 nozzle_diameter: 0.400 filament_diameter: 1.750 heater_pin: EBBCan: PB13 #sensor_type: EPCOS 100K B57560G104F #sensor_pin: EBBCan: PA3 sensor_type: MAX31865 sensor_pin: EBBCan: PA4 spi_bus: spi1 rtd_nominal_r: 1000 rtd_reference_r: 4300 rtd_num_of_wires: 2 control: pid pid_Kp: 21.527 pid_Ki: 1.063 pid_Kd: 108.982 min_temp: 0 max_temp: 250
