Lesson Notes By Weeks and Term v4 - SHS 2
DIGITAL ELECTRONICS
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DIGITAL ELECTRONICS
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Subject: Physics
Class: SHS 2
Term: 2nd Term
Week: 17
Grade code: 2.3.3.LI.3
Strand code: 3
Sub-strand code: 3
Content standard code: 2.3.3.CS.1
Indicator code: 2.3.3.LI.3
Theme: ELECTRIC FIELD, MAGNETIC FIELD AND ELECTRONICS
Subtheme: DIGITAL ELECTRONICS
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Good day, class. Today, we are moving further into the exciting world of digital electronics. Look around you in your daily lives: the time on a digital clock, the price of petrol at a GOIL or Shell station, the channel number on an old DStv decoder, or the reading on your ECG prepaid meter. All these devices need a way to show numbers to us. One of the most common and simple ways they do this is by using a 7-segment display. Understanding how this small device works is a fundamental step in learning how digital information is made visible to the human eye.
a) What is a 7-Segment Display?
A 7-segment display is an electronic display device for displaying decimal numerals. It is essentially a collection of eight Light Emitting Diodes (LEDs) arranged in a specific pattern to form numbers and some letters. Seven of the LEDs are arranged in a rectangular fashion to form the number shape. These are called segments and are labelled `a` through `g`. The eighth LED is for the decimal point (`dp`).
Here is the standard layout and labelling:
``` ---a--- | | f b | | ---g--- | | e c | | ---d--- (.) dp ```