Set up your Mac, PC, or Linux enviroment by downloading the free Arduino Integrated Development Environment (IDE).

The tiny board you have is a Digispark clone, and the additional software to use it is here.

Most of the code is inside the .ino files. For the Tone/Melody program, also copy the contents of the pitches.h file to a new tab (name it pitches.h when it asks).

Original Tutorial at AdaFruit. Ours changed the following: redPin = 0, greenPin = 1, bluePin = 4. We also changed some of the colors because the brightness varies by which brand of RGB LED you use, your resistor values, etc. etc.

Number of colours in spectrum or rainbow.

The code is inside the .ino files. For the Tone/Melody program, also copy the contents of the pitches.h file to a new tab (name it pitches.h when it asks).

Original Tutorial at the official Arduino site, and our change was to move from pin 8 (which the DigiSpark clone does not have) to 0. You can use any pin marked PWM which I believe are 0, 1, 2, and 4.

Meter: Percent * 0.0825.

This one didn't seem to work (the temperature goes up and down a lot).

Original Tutorial at DigiStump.com