V1 ARDUINO MEGA SENSOR expansion shield

Features:
• 54 x Digital IO port (48 servo port) and power supply
• 16 x analog IO port and power supply
• 1 x digital port binding post
• Auto switch of external power and onboard power
• ISP download port
• 3 x serial external port
• Reset button
• Xbee/APC/Bluetooh Bee bluetooth wireless digital serial port
• IIC/I2C/TWI port
• 3.3V output port
• SD card module port
• 3 x serial port
• L (PIN13) indicator lamp