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: 13
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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Welcome, students! Today, we are diving into a fascinating part of digital electronics that you see every single day. Have you ever looked at the digital clock in a tro-tro, the price display at a GOIL or Shell fuel station, the scoreboard at the Accra Sports Stadium, or the queue number display at an ECG office? The numbers you see are often made using a simple but powerful device called a 7-segment display. Understanding how this works is a fundamental step into the world of digital devices, from simple calculators to complex computers. This lesson will demystify how these glowing numbers are formed and give you the skills to control them yourselves.
What is a 7-Segment Display?
A 7-segment display is an electronic component used to display decimal numbers and some letters. It is essentially a collection of eight Light Emitting Diodes (LEDs) arranged in a specific pattern. Structure: Seven of the LEDs are arranged in a rectangular figure-8 shape to form the numbers. The eighth LED is for the decimal point (dp). Labelling: To control which parts of the number light up, each of the seven segments is given a letter name from 'a' to 'g'. The decimal point is 'dp'.
Here is the standard labelling:
``` ---a--- | | f b | | ---g--- | | e c | | ---d--- (dp) . ```