Next we'll look in-depth at the most significant differences between the RedBoard and Arduino Uno. They really share more similarities than they do differences. The RedBoard, Arduino Uno SMD, and Arduino Uno PTH have a lot in common. They can be powered either through USB or with a 7-15V barrel jack power supply. Operating Voltage: Both boards operate at 5V, and have an on-board 3.3V regulator.Digital and Analog Pins: Each board has 14 digital I/Os and 6 analog I/Os.
All shields and enclosures will be compatible with both boards.
Dimensions and Connector Layout: Both boards are the same size and shape, and the female header connectors are all placed in the same locations. That means, when you program the board, you can still select Arduino Uno under the Tools > Board menu. 
IDE interaction/Board Selection Type: The ATmega328 on both boards is loaded with the same bootloader (Optiboot). ATmega328: The main microprocessor on both boards is the popular ATmega328. Price: Because we manufacture the board in-house, here in Boulder, CO, we can afford to keep the price-tag a tad lower. Color: It won't have any real influence on the operation of the Arduino, but it certainly affects the board's swag-factor. No sharp edges on the bottom of the board! The RedBoard takes this a step further, by making every component surface-mount. SMD vs PTH: The Arduino Uno comes in two versions through-hole (PTH) or surface-mount (SMD). #Sparkfun arduino uno pinout drivers#
This difference is only really prevalent when installing drivers because each requires a different driver file.
USB-to-Serial Transciever: The Arduino Uno uses an ATmega16U2 loaded with custom firmware to convert between USB and serial. Each connector requires a different USB cable. USB connector: Arduino Uno uses a USB type B connector, while the Redboard uses the smaller mini-B connector. Stated briefly, here's the key info: Key Differences In this tutorial, we'll take an in-depth look at the major similarities and differences between the two boards. 
Our introductory video glosses over some of what makes the RedBoard different from the Arduino Uno: An Arduino Uno PTH (left, blue) next to a RedBoard.
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