DARC decoder

We've all been there - you've spent hours and hours trying to get that sketch working, but somehow, you're not reacting well to time critical events in your system. Maybe it's a wireless peripheral indicating when a packet is ready. Maybe it's an external Flash device signaling when data is ready to be read out. Maybe it's as simple as a button push that you need to react quickly to! But, try as you might, it seems the best way to see these sort of events is to just `digitalRead()` that pin over and over in your main `loop()` function until something interesting happens. ...or is it?

This article uses examples to explain the technique of source transformation.

NAND and NOR gates are widely known to be universal logic gates, meaning that any other logic gate be made from NAND or NOR gates. This article discusses other universal logic gates.