Seven Segment Display
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This document discusses seven segment displays and how to interface them with microcontrollers. A seven segment display uses 7 LED segments (a, b, c, d, e, f, g) plus a decimal point to display numbers from 0 to 9. There are two types: common cathode, where the cathodes are connected and the anodes are individual; and common anode, where the anodes are connected and the cathodes are individual. When interfacing with a microcontroller like the 8051, common cathode displays use logic high outputs while common anode uses logic low outputs to light the correct segments to display the desired number.
Seven Segment Display
- 1. What is seven segment display? How it works? Seven segment display handling with 8051 microcontroller.
- 3. Seven segment display comprises seven LEDs and a LED for decimal point. Lit them in order ,can forms different letters and alphabets. Seven segment display is special for displaying numerical characters.
- 4. Displaying 0-9 in SSD
- 6. Each segment is designated as a, b, c, d, e, f and g along with dp for decimal point.
- 7. There are two types of seven segment display. • Common cathode seven segment display. • Common anode seven segment display.
- 9. Common cathode seven segment display is such in which cathode of each LED is connected to make single pin while anode are separate. In order to lit required LED high voltage is supplied to anode. They are interfaced with logic high. A required value of resistance is to be connected across anode in order to prevent their fusion.
- 10. Common anode
- 11. In Common anode seven segment display anode of each LED is connected to make a single pin. In order to lit LED ,cathode of each LED is to be connected individually with logic 0 i.e. with low voltage. Anode is supplied with required regulated lit voltage.
- 13. During interfacing seven segment display with μc 8051,both types of seven segment display can be interfaced. For common cathode SSD logic 0-output is to be considered. For common anode SSD logic 1-output is to be considered.
- 14. In system with input , program should be done conditionally. By using conditional statements we can display letters and alphabet in SSD.