Tip

• SHT36/42 does not come pre-flashed with Katapult firmware for CAN connection from the factory.
• The Katapult firmware for SHT36/42 CAN connection is available at 500K and 1M baud rates. You can flash it yourself if needed.
• Katapult firmware flashing

Firmware Flashing Instructions

• SHT36/42 can be connected to the host using a CAN connection.

• CAN requires MX3.0 metal terminal crimping.

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Selecting the Firmware Type

Please confirm the connection method first.

• SHT36/42 can only connect to the host via CAN.
• When a CAN tool board is required: please choose CAN firmware.

Firmware Type	Applicable Scenario	Advantages	Confirm Before Selecting	Operation
CAN Firmware	When a CAN tool board is required	Supports connecting multiple devices via CAN bus	Confirm that the host supports CAN, and prepare a UTOC or USB-CAN bridge board	Compile CAN 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.