![]() Similarly the 7-segment, 4-digit are either common cathode or common anode, hence we have four common pins for the 4 digits. ![]() The 7-segment is arranged in two ways: either all the cathodes of the segment are gathered in one pin (GND), and this type is called common cathode, or all the anodes are gathered in one pin (Vcc), and this type is called common anode. On the other hand, the 4 -digit display does not have 40 pins, rather it has only 12 pins: 7 segments, one dot, and 4 digit selection pins that select which digit will be active to display the character sent by the Arduino on the 7+1 segment pins. ![]() ![]() ![]() The 1 digit, 7-segment display has 10 pins, 7 for the segments, one for the dot, and 2 pins for the power supply (either GND or Vcc depending on the type of the display)
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