ASUS Chromebox.....

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Introduction to the Arduino Board

Looking at the board from the top down, this is an outline of what you will see (parts of the board you might interact with in the course of normal use are highlighted):

Starting clockwise from the top center:

• Analog Reference pin (orange)
• Digital Ground (light green)
• Digital Pins 2-13 (green)
• Digital Pins 0-1/Serial In/Out - TX/RX (dark green) - These pins cannot be used for digital i/o (digitalRead anddigitalWrite) if you are also using serial communication (e.g. Serial.begin).
• Reset Button - S1 (dark blue)
• In-circuit Serial Programmer (blue-green)
• Analog In Pins 0-5 (light blue)
• Power and Ground Pins (power: orange, grounds: light orange)
• External Power Supply In (9-12VDC) - X1 (pink)
• Toggles External Power and USB Power (place jumper on two pins closest to desired supply) - SV1 (purple)
• USB (used for uploading sketches to the board and for serial communication between the board and the computer; can be used to power the board) (yellow)

Arduino..

What is Arduino?

Arduino is an open-source prototyping platform based on easy-to-use hardware and software. Arduino boards are able to read inputs - light on a sensor, a finger on a button, or a Twitter message - and turn it into an output - activating a motor, turning on an LED, publishing something online. You can tell your board what to do by sending a set of instructions to the microcontroller on the board. (LINK TO SITE)