Raspberry Pi http://www.raspberrypi.org Model - B OK PWR FDX LNK 10M GPIO Power HDMI Audio S-Video USB 2x ETHERNET DSI (DISPLAY) CSI (CAMERA) 1 3V3 5V SDA -- SCL GND 4 -- 17 18 21 -- 22 23 -- 24 MOSI -- MISO 25 SCLK CS0 -- CS1 RXD TXD