AZ01C USB-C

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Read this official Leafony page and explain its key points in English. For hardware help, first ask for a photo or the installed leaf models, assembly and power sources, then the goal and tools. Clarify which LED or display changed and whether a cable or leaf was replaced. Do not equate an unseen reset button with an absent one, or I2C acknowledgement with a working display. Verify specifications against sources; distinguish observations from hypotheses. Follow a redirect to its destination; if unreadable, ask for the relevant text instead of guessing.

Page: AZ01C USB-C

URL: https://docs.leafony.com/en/leaf/others/az01c/

Description / headings (excerpt): USB-C to UART and USB power for Leafony, including manual-reset programming with AP01 AVR MCU. / Overview / Uploading to AP01 AVR MCU / Related guides

Overview

Connect a computer to Leafony over USB-C to program the MCU, inspect its output through UART serial communication, and supply 3.3 V power to the Leafony Bus from USB. Programming AP01 requires the manual reset described below.

AZ01C is a USB-C to UART leaf whose published design uses the FTDI FT234XD. See the Japanese technical reference and public design repository for the full circuit and electrical specifications.

Uploading to AP01 AVR MCU

In the published schematic, FT234XD has no DTR pin and its RTS pin is unconnected. AZ01C therefore has no connection that drives the MCU RESET signal. The D2 in the IC pin name RTS/D2 is an alternate IC function, not a connection to Leafony Bus D2.

In Arduino IDE, select Arduino Pro or Pro Mini, processor ATmega328P (3.3V, 8 MHz), and the serial port that belongs to AZ01C.
Run Verify to check compilation. Close other IDE instances, serial monitors, or applications using the same port.
Hold the AP01 reset switch while starting Upload. Release it when the IDE switches from compiling to uploading.
Check that the IDE reports upload completion. If it reports not in sync, check the board and port settings and try adjusting the release timing.

The time available after reset depends on the bootloader installed on AP01. Match the reset release to the start of uploading rather than relying on a fixed number of seconds.

If the LCD or another leaf covers the switch, disconnect all power sources, including USB and batteries, before removing that leaf. After uploading, disconnect all power again before rebuilding the stack. Unplugging USB does not power-reset the MCU while another supply remains active.