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+--- Thread: KC868-A16 UART pins (/showthread.php?tid=9055)
KC868-A16 UART pins - sign_in - 02-18-2026
Hi guys,
I just got an A16 board. I read the design review (https://www.kincony.com/esp32-board-16-channel-relay-hardware.html) but I didn't really find any proper solution to connect RX / TX UART TTL pins to the board (for my R503 fingerprint sensor).
Could someone please help me how to connect that sensor / use UART with that board?
Thanks and best regards!
Stefan
RE: KC868-A16 UART pins - admin - 02-19-2026
KC868-A16 have 4 free gpio with pull up resistance. if you want use these gpios, you need remove the resistance, so that can use for define serial port rxd and txd.