Arduino UNO R3 SMD Compatible Board, ATmega328P, CH340 USB, 5V 16MHz

The Uno R3 is the board most people start with, and this SMD version gives you the same experience at a lower price. It follows the Uno R3 layout, so the tutorials, sketches, libraries, and shields you find online work on it without changes.

The main difference is inside. The ATmega328P chip is the flat surface-mount type instead of the larger plug-in type, and USB communication is handled by the CH340 chip.

You get 14 digital pins, six of which can give PWM output, plus 6 analog inputs. That is enough for most student and DIY builds, such as line-follower robots, home automation, sensor displays, and small machines. You can power it from your computer’s USB port or from a 7-12V adapter through the DC jack.