Arduino Nano is a nice, small and cheap member of the Arduino family. It is based on the Atmega328 chip, what makes it as powerful as the biggest his brother Arduino Uno, but it can be obtained for less money. In Ebay now Chinese versions can be bought for less than 3 USD. Additionally to its smaller size comparing with Arduino Uno, the Nano board has also the advantage to have two more analog inputs A6,A7. So far so good... But Arduino Nano has also some disadvantages compared with Uno.

• Extension shields can not be used directly with Arduino Nano;
• External power supply source different than 5V can not be used - no DC jack presents.
• For the generating of the internal 3.3V is used the embedded in the Atmega328 voltage regulator, which can not provide currents higher than 100-150 mA.
• Making small experimental projects require the presence of a breadboard.

All these problems are solved by the Arduino Nano to Uno conversion board developed by me.