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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 is available in two rates: 500K and 1M. You can flash it yourself if needed.
  • Katapult Firmware Flashing

Firmware Flashing Instructions

  • SHT36/42 can connect to the host computer via CAN.
  • 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 computer via CAM.
  • CAN Firmware Flashing
    • Advantages: If the Katapult firmware is flashed, you can update the firmware without touching the mainboard, and it supports bus connections.
    • Disadvantages: It may cause errors such as homing timeouts when used with KlipperScreen.
    • Note: If you need to use CAN, ensure that the host computer supports CAN and that you have a UTOC or a mainboard flashed with bridge firmware.

Katapult Firmware Explanation​

Tip

Katapult was originally named CanBoot and later renamed to Katapult.

  • Katapult firmware is a type of bootloader that can be used in conjunction with Klipper. After flashing via methods like DFU, the firmware can be updated with a single command.
  • Advantages: Quickly double-click the reset button or power off twice rapidly to enter Katapult firmware, at which point the motherboard's LED will blink.
  • Katapult firmware can only be used to flash firmware and cannot connect to Klipper!!!
  • Katapult firmware supports three methods for connecting to the host computer, with each method's firmware being independent of the others:
    • CAN connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated directly using commands, with strong anti-interference capabilities.
      • Disadvantages: The firmware compilation rate must be known in advance.
    • RS232 connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated using commands, with very strong anti-interference capabilities.
      • Disadvantages: Firmware cannot be updated with a single command; manual entry into Katapult firmware is required.
    • USB connection
      • Advantages: After compiling the Klipper firmware, the firmware can be updated directly using commands.
      • Disadvantages: Long data cables are prone to interference, which may cause disconnections.
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