GPIO, 功能, pin, pin, 功能, GPIO. power, 3.3V, 1, 2, 5V, power. GPIO2, I 2 C SDA, 3, 4, 5V, power. GPIO3, I 2 C SCL, 5, 6, GND. GPIO4, GPCLK0, 7, 8, TXD, GPIO14.
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