The Raspberry Pi is one of the world’s most successful hardware projects. A lot of people have one, but not everyone knows what to do with it. You can use it as a desktop computer or the brain of an electronic circuit. I use the Raspberry Pi to blink LEDs — with C# and .NET GPIO APIs — in weird and wonderful ways. It’s straightforward to blink a single LED, but it gets cumbersome to wire and control multiple LEDs once you get past half a dozen. In this post, I’ll show you how to control multiple LEDs easily, with a mix of code and hardware.