When all the segments are powered, the number 8 is displayed, and if the power supply to "g" is disconnected, the number 0 is displayed. In a seven-segment display, power (or voltage) can be applied to different pins at the same time, so we can form combinations to display the numbers 0 to 9. Since the seven-segment display cannot form letters such as X and Z, it cannot be used for letters and can only be used to display decimal values. However, the seven-segment display can form the letters A, B, C, D, E and F, so they can also be used to represent
Each display unit usually has a dot-shaped dot (DP), and the display dot can be located on the left or right side of the display pattern. This pattern can be used to display numbers from 0 to 9 and letters of hexadecimal numbers from 1 to F.
Truth Table:
We can make a truth table for each decimal number
The Boolean expression for each decimal digit that requires the corresponding light emitting diode (LED) to be either ON or OFF. The number of segments used for the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 are 6, 2, 5, 5, 4, 5, 6, 3, 7, and 6 respectively. The seven segment display has to be controlled by other external devices where different types of microcontrollers can be used to communicate with these external devices like switches, keypads, and memory.
