What types of Arduino are available and how do they differ?

There are currently over thirty versions of the Arduino board available on the market. They differ in the central systems used, the number and position of the pins, supported interfaces or additionally installed modules (e.g. Ethernet or Bluetooth). The most popular versions of Arduino used for electronic projects include Arduino Uno R33, Arduino Leonardo and Arduino Zero. Before you buy the board you need for a particular project, it is worth finding out which model has the most compatible parameters for that purpose. However, if you are buying an Arduino to learn programming or electronics in general, it is best to choose one of the most popular basic versions. They are also available in sets with other electronic components.