Keith writes:
An Arduino “shield” is a PC board made to plug into the top of the Arduino, covering it (hence the name) and extending the Arduino signals to provide some extra functionality. Shields I know about are prototyping shields (”protoshields”), with a tiny breadboard on top; motor control, with H-bridge drivers to run motors, servos, and steppers; and ethernet, with a Lantronix Xport ethernet interface onboard. (I know there are shields from places other than Adafruit, but I really like supporting Lady Ada’s open-source hardware lifestyle, so I tend to look there first.)
Keith’s Arduino Shield - [Link]











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