Arduino Tutorial #3 - Functions, return values and variables

A tutorial on sketch structure, functions, return values and variables.
Sketch / code used in tutorial:
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Items and topics covered in this video:

* Local and global variables
* Functions / procedures
* Return values from functions
* Sample sketch code that does Math / arithmetic and write to the terminal
* Some commands used: Serial.print; Serial.println, if, else, void setup, void loop, return

Arduino Uno R3 features:

* ATmega328 micro controller
* Input voltage - 7-12V
* 14 Digital I/O Pins (6 PWM outputs)
* 6 Analogue Inputs
* 32k Flash Memory
* 16Mhz Clock Speed

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