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Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Green
Overview | Adafruit LED Backpacks | Adafruit Learning System
GitHub - adafruit/Adafruit_Python_LED_Backpack: Python library for controlling LED backpack displays such as 8x8 matrices, bar graphs, and 7/14-segment displays on a Raspberry Pi or BeagleBone Black.
Overview | LED Backpack Displays on Raspberry Pi and BeagleBone Black | Adafruit Learning System
Adafruit 7-Segment LED Matrix Backpack | Paradisetronic.com
Adafruit Small 1.2" 8x8 LED Matrix w/I2C Backpack - Red or Green