Quite a few shields can function just fine with a board running at either logic level but you may run into some erratic behavior with level shifting circuits set up to work best with a 5V system. For example, the Arduino Uno R3 runs at 5V logic where the RedBoard Artemis runs at 3.3V. XBee Shield Pins Rerouted for ATmega32U4-Based ArduinoĪlso note that there are several Arduino development boards available now that fit the R3 form factor but run at a different logic level than the standard Uno/RedBoard. XBee Shield Pins Rerouted for ATmega2560-Based Arduino For more information, check out the XBee Shield Hookup guide. If you were to use the Arduino Leonardo (an ATmega32U4-based board) or the Arduino Mega 2560 (an ATmega2560-based board), you would need to reroute the connection and redefine the pin definitions. For example, the XBee shield was designed for the Arduino Uno R3 (an ATmega328P-based board). If a shield was designed with the ATmega328p in mind, the pin functionality may be in a different location. Additionally, you will also want to ensure that shield pins are compatible with your development board.
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