Title: Klipper Error: "Unknown temperature sensor" with heater_generic and MAX31855

General Discussion
1

Hello everyone,

I’m hoping someone can help me with a Klipper configuration issue that I’ve been stuck on for a few hours.

I am trying to configure a custom, SSR-driven heater that uses a MAX31855 temperature sensor.

My [max31855] sensor section appears to be working correctly. If I remove the [heater_generic] section from my printer.cfg, Klipper starts without any errors, and I am able to read the temperature from the sensor just fine.

However, as soon as I add the [heater_generic] section to control the heater, Klipper fails on startup with the error: Unknown temperature sensor 'custom_heater_temp'.

It seems the [heater_generic] module cannot recognize the sensor that has been defined. I would appreciate any help you can provide. I’m getting really frustrated with this issue. Thank you in advance.

printer.cfg

[include mainsail.cfg]

[printer]
kinematics: none # I am not making a 3D printer!
max_velocity: 500
max_accel: 3000

[mcu]
serial: /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
restart_method: command

[temperature_sensor custom_heater_temp]
sensor_type: MAX31855
sensor_pin: PB12                 # This is the Chip Select (CS) pin
spi_software_sclk_pin: PB13      # This is the Clock (CLK) pin
spi_software_miso_pin: PB15      # This is the Data Out (DO) pin
spi_software_mosi_pin: PB14   # Required by Klipper, but not used by the MAX31855
min_temp: 0
max_temp: 300

[heater_generic custom_heater]
heater_pin: PC6
sensor_type: custom_heater_temp
control: watermark
max_power: 1.0
max_temp: 100
max_delta: 2.0
2

Please attach, as it was requested, the klippy.log to your next post.

There is no hardware sensor that is called custom_heater_temp. So you have no senor_pin in [heater_generic]

On line 23 try with

sensor_type: temperature_sensor custom_heater_temp]