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4-digit 7-segment displays are really neat little devices, it's a shame that they can be so cumbersome to control. Well we've solved that problem by making them a little bit "smarter." The 7-Segment Serial Display combines a classic 4-digit 7-segment display and an ATMega328 microcontroller allowing you to control every segment individually using only a few serial lines.
The Serial 7-Segment Display can be controlled in one of three ways: Serial TTL communication, SPI serial communication or I2C serial. You can even program it for stand-alone operation since the ATMega328 comes pre-loaded with the Arduino bootloader! There is also an FTDI header on board and we've provided a hardware profile for the Arduino IDE to make it even easier to program.
Project description, more information and ordering can be found at https://www.sparkfun.com/products/11443
Arduino Add-On: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Components/LED/7-SegmentDisplay_Arduino_addon.zip
Github Repo: https://github.com/sparkfun/Serial7SegmentDisplay