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Adafruit 0.56 4-Digit 7-Segment Display w/I2C Backpack - Yellow : ID 879 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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4 digit 7-segment display (common anode or cathode) with or without 74hc595 - LEDs and Multiplexing - Arduino Forum
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Why does a 4 digit 7 segment cathode display wired to an Arduino not need to be connected to ground? - Arduino Stack Exchange
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