Serial TXD

GPIO Pin 5

Serial RXD

SPI MOSI (Master Out, Slave In)

SPI MISO (Master In, Slave Out)

GPIO Pin 6

SPI SCLK (Serial Clock)

SPI CE0 N (Cable Select Line 0)

SPI CE1 N (Cable Select Line 1)

Output Voltage 3V3

Output Voltage 5V

GPIO Pin 0

I2C SDA 0 (Serial Data)

GPIO Pin 1

I2C SCL 0 (Serial Clock)

GPIO Pin 2

Ground

GPIO Pin 7

GPIO Pin 3

Pin 9 DNC

Pin 4 DNC

Pin 14 DNC

Pin 20 DNC

Pin 17 DNC

Pin 25 DNC