IO Expansion shield is one of the market favourites. Fast robotics prototyping made affordable and simple thanks to this design. 1.Very common Xbee socket for multipurpose wireless connectivity such as RF, wireless, bluetooth. 2.The new version includes a voltage hardware setting through a jumper to allow compatibility with a bigger range of components at 3.3v like Raspberry pi, Due and others.3.It also includes a Servo external power, with a protective diode. This way you can enable a large range of servos from your Arduino.4.Latest version features a convenient switch that lets you program your ATmega328 boards like UNO, while you have another Serial device connected like a Xbee. 5.Switch it, program it and get it back up and running with another switch. You don't need to disassemble your hardware or wiring.
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