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

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. http://www.avagotech.com/products/led_displays/seven_segment_displays/0.3%22_single_digit_series/hdsp-u203/ http://www.nova68.com/Merchant2/graphics/00000001/SPACEWATCH.jpg http://www.led-signs.com/displays/led_clocks.htm http://yhled.en.ec21.com/product_detail.jsp?group_id=GC01826620&product_id=CA01827451&product_nm=LED_Digit_Display http://candy68.en.ec21.com/product_detail.jsp?group_id=GC02564635&product_id=CA02590117&product_nm=Sell_LED_Display Project Lead The Way, Inc. Copyright 2009

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 http://www.thelearningpit.com/lp/doc/7seg/7seg.html Project Lead The Way, Inc. Copyright 2009

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

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

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

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

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