Tip

• The SHT36 V2 provides Katapult firmware for both USB and CAN connections; you can flash it yourself if needed.
• Katapult firmware flashing
• The SHT36 V2 comes pre-flashed from the factory with Katapult firmware for CAN connections at a baud rate of 1M.

Notes

• The SHT36 V2 uses three different types of main controllers. Please do not flash the wrong firmware, or it will fail to boot.
• For APM 072 and STM 072, please refer to 072 CAN Firmware Flashing
• For STM 103, please refer to 103 CAN Firmware Flashing

Firmware Flashing Instructions

• Firmware compilation and flashing both require the host machine.

• The SHT36 V2 can be connected to the host machine via CAN.

• CAN requires a XT30(2+2)-F connection.

• Below is the XT30(2+2)-F data cable style:

  Loading...

Important Notes

• The mainboard firmware must be flashed with Klipper through Katapult.
• If you are certain the mainboard has already been flashed with Katapult, you can skip the Katapult firmware flashing step at the end.

Selecting the Firmware Type

Please confirm your connection method first.

• The SHT36 V2 can only connect to the host machine via CAN.
• If you need a CAN tool board: please choose CAN firmware.
• Please select the corresponding firmware page based on your MCU model.

Firmware Type	Applicable Scenario	Advantages	Confirm Before Selecting	Action
CAN Firmware (STM32/APM32 F072)	When using the F072 version	Supports connecting multiple devices via the CAN bus	Please confirm your MCU model and CAN baud rate, then select the corresponding page: 072 Firmware	View F072 Firmware
CAN Firmware (STM32 F103)	When using the STM32F103 version	Supports connecting multiple devices via the CAN bus	Please confirm your MCU model and CAN baud rate, then select the corresponding page	View 103 Firmware

Katapult Firmware Notes

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.