wozItDo: Tiny IQ puzzel, BIG challenge using atmaga

Hardware components:
	Atmel ATTiny85	×	1

	LED (generic)	×	3

	Resistor 221 ohm Or similar, I used 220 ohm	×	3
	SparkFun Pushbutton switch 12mm or similar	×	1
	Coin Cell Battery Holder	×	1
	Coin Cell Battery CR2032 any 3v cell that fits is fine	×	1

Hand tools and fabrication machines:
	Soldering iron (generic)

Story

I think of this puzzle as the electronic equivalent of those annoying “IQ” puzzles (e.g. where you have to get two parts apart). A wozItDo has just one button and three LEDs and all you have to do is to work out what it does. Beware: it’s deceptively tricky and once you think you’ve cracked it, there’s still more.
So what’s with the name? We’ll about 30 years ago I made my first “computer”. A 6502 MPU with a keypad, some 7-segment LEDs and a handful of other bits. I was inordinately proud of it but when I showed it off to other people they seemed unimpressed and often asked “But what’s it do?” Nothing, really, but that’s not the point.

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