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Project Notes

#480 7-Segment LED Displays

All about LED 7-segment displays…



There is a huge range of 7-segment LED displays in the market. Although basically the same, they vary in critical ways:

  • common anode or common cathode configuration
  • arrangement of pins
  • size, LED colour and forward voltage

The basic unit will have 10 pins, and comprise 7 LED segments plus a decimal point and a common anode or cathode.

Although pin assignments vary, they all operate in a similar manner:

  • the “common anode”/”common cathode” terminology basically indicates the polarity of the circuit. Common cathode means all the LED segments share a common cathode (negative pole) and are switched on by pulling segment pins high.

LED 7-Segment Components

The 7-segment components I have are similar to the SC56-11.


Segment SC56-11 pin
a 7
b 6
c 4
d 2
e 1
f 9
g 10
dp 5

Credits and references

About LEAP#480 7-SegmentLED
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.