If the male headers are soldered to the bottom of the board, the board can’t be mounted directly into a breadboard since the separate sections of headers on one side are not spaced apart on 0.1″ centers and the holes are offset somewhat side-to-side. The board comes with a strip of male headers which are normally soldered to the top side of the board as shown in one of the pictures. These can be soldered to either the top or bottom side of the board.

Our 7.5V AC adapter works extremely well for powering these boards.Ī great feature on this version of the board is that besides the standard female headers for bringing out I/O, each female header also has a row of holes next to it to which can be soldered male headers, a second row of female headers or even wires. Higher input voltages will cause the on-board regulator to work harder and may cause it to overheat. If an external supply is used, it is recommended to use a supply between 7-12V. The power source is selected automatically if both are available. The Uno R3 SMD operates at 5V which can be supplied via an external power supply or through the USB port connection.

6 Analog inputs that can also be used as digital I/O for a total of up to 20 digital I/O.

It uses an SMD version of the microprocessor rather than the older style DIP package used on the original product and has some additional features.

The Uno R3 SMD is an Uno compatible version of the latest R3 iteration of the Arduino Uno, which is the most popular of the many development boards available for hobbyists.

Datasheet arduino uno r3