Detailed Specification

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Detailed Specifications

Arduino Pin Mappings

Pin Reservations

  • Ethernet Shield (W5100)
    • I2C Pins
      • Pin 20 (SDA), 21 (SCL)
    • SPI Pins (Communicates through the ICSP header)
      • 11,12,13 SPI Bus(Uno/Other Atmega 328 boards)
      • Pin 10 SPI Select (All boards)
      • Pin 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS)(Mega/2560 only)
      • Pin 53 (Reserved - Mega only)
  • Ethernet shield SD card slot
    • Pin 4 SPI Select (All boards)
  • Xbee Shield, on-board USB
    • Pins 0,1
  • Additional Hardware Serial Ports
    • Port 1: Pins 18,19 (TX/RX)
    • Port 2: Pins 16,17 (TX/RX)
    • Port 3: Pins 14,15 (TX/RX)
  • USB Host Shield from Circuits @ Home
    • Pins 9,10 (Default Configuration)
    • Solder traces can be cut and spliced for other configurations.