To turn on a specific segment in common cathode mode, we connect that pin to the voltage or to a logic high level with a microcontroller How to control 7 segment Display with Pic Microcontroller?Īs we mentioned earlier, it consists of 7 light-emitting devices that are arranged in a rectangular design box. In common cathode display, all the cathode connections of the LEDs are tied together which forms the common pin that needs to be grounded. To turn on a specific segment, we connect that pin to the ground or logic low level. In common anode display, the positive pins of all the LEDs are tied together to form the common pin which needs to be provided a ‘HIGH’ signal that means 5 volts signal. A common pin is also associated with the 7-segment, which is used to identify the type of 7-segment display whether it is the common anode or a common cathode.
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