Arduino is an open-source electronics platform. It can be used as an interface between software and hardware components to make fun interactive projects. To date, many projects have been made at Derry CoderDojo including a synthesizer, magic 8 ball and much more.
Don’t have a arduino board? No problem! 123D Circuits is a free online circuit simulator that allows you to create and code arduino projects.This is a very useful tool to test a project before you make it from physical parts.
The software for writing code to your Arduino board can be downloaded from here