CH32V103C8T6 core board, with 1.3-inch OLED screen, 4 LEDs (2 of which are used for WCH-link), 1 passive buzzer, onboard WCH-link, plug in the micro-USB cable to start debugging, lead out The second and third serial ports and all free IOs are installed to facilitate expansion. All components are located on the front, which is convenient for proofing. CH549F is not in stock. I bought a private library of 30 pieces and prepared to share it. You can choose if you need it. All devices except OLED can be obtained from Lichuang.
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