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: 16
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 morning, class. Look around you. From the digital clock on your phone or wrist, to the display on a microwave oven at home, the fuel pump at a GOIL station, or the scoreboard at the Baba Yara stadium, we see numbers displayed electronically everywhere. How does a device show the number '8', and then change to show a '7'? The magic behind many of these displays is a simple but brilliant component called the 7-segment display. Today, we are going to demystify this component and learn how to control it ourselves. Understanding this is a fundamental step into the world of digital electronics, the technology that powers our modern world.
A. What is a 7-Segment Display?
A 7-segment display is an electronic display device for displaying decimal numbers (and some letters). As its name suggests, it consists of seven individual light-emitting diodes (LEDs) arranged in a rectangular fashion. An eighth LED is sometimes included for the decimal point (dp).
Each of the seven LEDs is called a segment. By turning on specific combinations of these segments, we can represent the digits 0 through 9. The segments are universally labelled with the letters a, b, c, d, e, f, and g.
Here is the standard arrangement: