![]() Note: If we use common anode type 7 segment display, control signals (a-g) will be active low (ground reference) and similarly for common cathode type, control signals are always active high level ( usually 5 volts). Similarly we can display other numbers by controlling respective light-emitting devices. For example, if we want to display 1, we turn on segments ‘b’ and ‘c’ and to display 2, we turn on segments a, b, g, d, and e. ![]() Each segment is referred with the name from a to g. By controlling specific lights, we can display numbers from 0-9. 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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