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The TONE function on the Arduino generates a square wave on the specified pin based on the parameters specified. In other words, it quickly turns the pin on and off at the frequency specified. The syntax is:
Tone(p,f,d)
where p = the pin, f = the frequency in hertz (number of times per second) and d = duration to sound the tone in milliseconds (thousandths of a second). So, if you want to play the note middle C (about 260 hertz) for two seconds on pin 3 you would call:
Tone(3,260,2000)
In terms of hardware, you would need to connect a small speaker to the Arduino pin, one connection to the output pin (3 in our example) and the other speaker connection to ground (GND).
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