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Tip
  • SHT36/42 does not come pre-flashed with Katapult firmware for CAN connection
  • The Katapult firmware for SHT36/42 CAN connection supports rates of 500K and 1M, and can be flashed as needed
  • Flash Katapult Firmware

Firmware Flashing Instructions

  • SHT36/42 can be connected to the host via CAN connection
  • CAN requires the use of MX3.0 metal terminal crimping
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How to Determine Which Firmware You Need​

  • SHT36/42 can connect to the host via CAN
  • Flash CAN Firmware
    • Advantages: If the Katapult firmware is flashed, the firmware can be updated without touching the motherboard, and bus connection is supported
    • Disadvantages: Using it with KlipperScreen may cause errors such as homing timeout
    • Tip: If you need to use CAN, ensure that the host supports CAN, and you need to use a UTOC or a motherboard flashed with bridge firmware

Katapult Firmware Instructions​

Name Explanation

Katapult was formerly known as CanBoot, and both names may appear simultaneously in older tutorials or firmware names.

Katapult is a bootloader used to boot and update Klipper:

  • Katapult itself cannot be used as a Klipper MCU; after flashing, you still need to write Klipper firmware that matches the hardware and communication method.
  • Supported tool boards can enter Katapult by quickly double-pressing the RESET button; after entering, there is usually a status light blinking.
  • CAN, RS232, and USB use independent Katapult firmware; you cannot simply modify file names or mix them directly.
  • For CAN firmware, you must also select the correct bus speed, with common speeds being 500K and 1M.
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