In common cathode type, the cathode of all LEDs are tied together to a single terminal which is usually labeled as ‘ com‘ and the anode of all LEDs are left alone as individual pins labeled as a, b, c, d, e, f, g & h (or dot). Seven segment displays are of two types, common cathode and common anode. Different characters can be displayed by selectively glowing the required LED segments. A seven segment display consists of seven LEDs arranged in the form of a squarish ‘8’ slightly inclined to the right and a single LED as the dot character. Knowledge about how to interface a seven segment display to a micro controller is very essential in designing embedded systems. 7 segment LED display is very popular and it can display digits from 0 to 9 and quite a few characters like A, b, C. This article is about how to interface a seven segment LED display to an 8051 microcontroller.
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