I bought an XBee shield V03 from geeetech.com and ran into a shield design problem while checking it out- before installing my Xbee module :slight_smile: It's the same circuit as http://arduino.cc/en/Main/ArduinoXbeeShield The Xbee modules are 3.3V and my Uno is 5V. For level translation there is …

Xbee and Wireless shields: 3.3V-5V level translating problem

CrossRoads September 30, 2012, 3:42am 2

There are 3.3V ProMini.
Fio is 3.3V.

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