(The “L” LED is on the Arduino directly behind the USB connection) The Integrated Development Environment (IDE) You use the Arduino IDE on your computer (picture following) to create, open, and change sketches (Arduino calls programs “sketches”. Arduino Uno One of the most popular Arduino boards out there is the Arduino Uno. While it was This is a book intended for beginners, but it is also intended to be useful to those who have used Arduino for a while and want to learn more about programming