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 Description

Katapult was formerly named CanBoot; both may appear simultaneously in old tutorials or old firmware names.

Katapult is the bootloader used to boot and update Klipper:

• Katapult itself cannot be used as a Klipper MCU; after flashing, the Klipper firmware matching the hardware and communication method still needs to be written.
• The method for entering Katapult is subject to the current product page: boards with a RESET button can enter by quickly double-pressing RESET; boards with only a BOOT button require fully powering off first, then holding BOOT while connecting USB, and releasing it once the device is recognized. After entering, there is usually a status LED blinking.
• CAN, RS232, and USB use mutually independent Katapult firmware and cannot be mixed by simply changing the file name or using them directly.
• CAN firmware must also select the correct bus rate; common rates are 500K and 1M.