A colorful LED light plugged into the USB port tells you whether a friend has appeared on the end of downloading the file or Skype, a device that tells Twitter, Facebook post, network speed etcBlink ...
"Blink (1) mk 2" arrived in the following package. Contents are wall fixing parts × 3, foldable metal USB cable, extension USB cable, replacement clear cover, blink (1) mk 2 body. It is fairly compact ...
It is a pretty common first project to use an Arduino (or similar) to blink an LED. Which, of course, brings taunts of: you could have used a 555! You can, of course, also use any sort of oscillator, ...
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