In this article I will add some simple Arduino LED projects starting with basic ones like how to turn on an LED, blinking, and more ... an external one or use the one soldered on the board (pin 13).

This snippet of Hello World code lets [Nico Ritschel] turn the Pin 13 LED on his Arduino on and off using Siri, the voice-activated helper built into iPhones. The trick here is using the Ruby ...