The Raspberry Pi pico development board is made based on official open source materials. The original circuit has been modified and upgraded. The overall dimensions and pin definitions are basically consistent with the official ones. It perfectly adapts to the official expansion board. The original PCB3.3 power supply has been modified and added K1 K2 has onboard buttons, adds a USB to serial port module, adds a USBHUB saving interface, adds an overcurrent insurance, and a TYPE-C interface for communication and power supply. Thanks to @an_ye for helping write the test program and solving the problems encountered during the test. After the welding is completed, power on, press and hold the BOOT button and then press reset to enter the download mode. The computer will recognize it as a disk. Drag the program directly into the disk to complete the download.
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