Raspberry Pi Model B (R1) h t t p : / / w w w . r a s p b e r r y p i . o r g OK PWR FDX LNK 10M Power HDMI Audio Video-Out USB 2x ETHERNET DSI (DISPLAY) CSI (CAMERA) 1 GPIO 3V3 5V 5V GND 4 GND 17 18 21 GND 22 23 3V3 24 GND 25 GND 10 MOSI 0 SDA 1 SCL 9 MISO 11 SCLK 14 TXD 15 RXD 8 CS0 7 CS1