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:

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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 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.