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  • Bill Levien thinks this is interesting:

14.2. Communicating with the Arduino by Using the Serial MonitorProblemYou want to display messages sent from an Arduino.SolutionThe Arduino IDE includes a feature called the serial monitor, which allows you to both send text messages to the Arduino and see messages from the Arduino over the USB cable.

From

Cover of Raspberry Pi Cookbook

Note

PyFirmata is a great tool for enabling communication between the Raspberry Pi and Arduino.