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u2u conversion board

Overview

The USB can be converted into a serial port and sent to the microcontroller. After processing by the microcontroller, it can be sent to the host via USB!

The microcontroller uses Atmega32u4 and uses an external crystal oscillator. The usb to serial port uses ch9350 and uses an internal crystal oscillator.

R1 is the status switch of ch9350. If it is not soldered, it is the slave computer mode. If it is welded with a 0 ohm resistor, it is the host computer mode (for specific differences, please check the chip manual)

Used alone, it is mostly used in applications that convert USB keyboards, mice, scanners and other devices into serial port data, which can reduce development time and does not require processing of USB protocols. Use state 0 or state 2 of the slave computer mode (the key values of the mass-produced driverless keyboard can be modified)

Design Files

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