New Pico Tutorials

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Gordon
Poor mans theremin, with the rangefinder and piezo.

That'd make a cool general project for the site - unfortunately I didn't include a rangefinder in with the Starter Kit, but it might be possible to do something even more hacky with an LDR :)

Dice is a nice idea too.

And CPU info can be even more hacky - on Linux at least you can just do:
```
echo `grep 'cpu ' /proc/stat | awk '{usage=(1+(($2+$4)/($2+$4+$5)))/20} END {print "analogWrite(B15,"usage",{freq:50})"}'` > /dev/ttyACM0
```
But actually doing something better would be really neat - maybe using the LCD to display lots of stats (and a graph :)

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