1. Seven Segment Displays
Digital Electronics
2.3 Data of Birth Design Problem
Seven Segment Displays
Project Lead The Way, Inc.
Copyright 2009

2. Seven Segment Displays
Digital Electronics
2.3 Data of Birth Design Problem
Seven Segment Displays
Covered in this presentation
Letters and numbers made on 7 segment displays
Common anode 7 segment displays
Common cathode 7 segment displays
As a class, have the students list some common everyday devices that use seven-segments displays.
Project Lead The Way, Inc.
Copyright 2009

3. Anode and Cathode displays
Seven Segment Displays
Digital Electronics
2.3 Data of Birth Design Problem
Anode and Cathode displays
Nothing more than LED’s shaped in an 8.
Each LED is given a label of a-g.
Anode more common in class, but cathode also used.
Anode is powered with each LED attached to “0” to light up.
Cathode is grounded with each LED attached to “1” to light up.
Common pin layouts for cathode and anode diagrams of seven segment displays
Project Lead The Way, Inc.
Copyright 2009

4. SSD Display Possibilities
Seven Segment Displays
Digital Electronics
2.3 Data of Birth Design Problem
SSD Display Possibilities
Decimal Digits 0-9
Select Alpha Characters
This slide shows all of the possible characters for a seven segment display. Take a moment here and see how many of these students came up with in their responses to the opening activity.
Simple Messages
Project Lead The Way, Inc.
Copyright 2009

5. Seven Segment Displays
Digital Electronics
2.3 Data of Birth Design Problem
Common Anode SSD
Example
What value would be displayed in the common anode seven-segment display shown?
Be sure to take time here for students to come up with an answer to this slide.
Project Lead The Way, Inc.
Copyright 2009

6. Seven Segment Displays
Digital Electronics
2.3 Data of Birth Design Problem
How to make an Anode SSD
Solution
Common Anode:
0 volts = Segment On
a, b, c, d, & g
5 volts = Segment Off
e & f
Be sure as you go over this solution to check for understanding with students as to why this functions this way.
Project Lead The Way, Inc.
Copyright 2009

7. Seven Segment Displays
Digital Electronics
2.3 Data of Birth Design Problem
Common Cathode SSD
Example
What value would be displayed in the common cathode seven-segment display shown?
Be sure to take time here for students to come up with an answer to this slide.
Project Lead The Way, Inc.
Copyright 2009

8. How to make a Cathode SSD
Seven Segment Displays
Digital Electronics
2.3 Data of Birth Design Problem
How to make a Cathode SSD
Solution
Common Cathode:
5 volts = Segment On
a, b, c
0 volts = Segment Off
d, e, f & g
Before moving on to breadboarding, take the time to make sure the students really understand the concepts here, perhaps doing more examples.
Project Lead The Way, Inc.
Copyright 2009