Homemade Atmega32u4 core board.
The core functions are consistent with ProMicro or Arduino Leonardo, and have more IO and greater output power.
This project is a standard version, using QFN-44 packaging, with a total of 23 GPIO interfaces , 1 VCC interface, 1 VBUS interface, 2 GND interfaces, 1 Reset interface, 1 Data+ interface, 1 Data- interface, 1 RAW power receiving interface.
Jumper is used as a jumper and can be connected to a 0Ω resistor or short-circuited. At this time, the chip and peripheral circuits are directly powered by VBUS .
B1, B2, and B3 are CLK, MOSI, and MISO interfaces in order, used for ISP programming.
You need to burn Arduino BootLoader to ATmega32u4 before use. See the video for details: https://www.bilibili.com/video/BV1sQ4y1a7Mj
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