BCD to Seven Segment DecoderThe Binary Coded Decimal (BCD) encoding method uses binary patterns to encode each decimal value (from 0 to 9), generally of 4bits. In contrast, a sevensegment display is an electrical device that displays Hexadecimal digits using seven Light Emitting Diodes (LEDs) arranged in a specific pattern (common cathode or common anode type) (in this case, decimal numbers, as input, are BCD, i.e., 09). 7Segment LED displays are of two types:
The separate LED segments of a sevensegment display are not directly powered. However, for it to function, we first convert our decimal number to its BCD equivalent signal, and then a BCD to sevensegment decoder converts that signal into the form supplied to the sevensegment display. The sevensegment decoder, which has four input lines and seven output lines (a, b, c, d, e, f, and g), receives this BCD (A, B, C, and D) input. The output is provided to a sevensegment LED display that shows the decimal number depending on the inputs. The truth table of Common Cathode Type BCD to the sevensegment decoder is given below:
Important points:
Let us now understand the few inputs: For Decimal Number = 0 The input lines for Zero are A = 0, B = 0, C = 0, and D = 0 and in the output lines, a to f are 1 and only g = 0. So, the g LED display will not glow, and the rest of the LEDs will glow, and we get zero on display. For Decimal Number = 2 The input lines for two are A = 0, B = 0, C = 1, and D = 0; in the output lines, a, b, d, e, and g are 1 and c and f are zero. So, only a, b, d, e, and g will glow, and we get two on display.
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