n. Seven Segment Display Lesson

n. Seven Segment Display Lesson - 1COMPUTER ENGINEERING...

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7 3 5 6 4 1 2 d 8 b f g e c a 12 10 9 11 14 13 1 C OMPUTER E NGINEERING Name:________________________ Seven-Segment Display Purpose: To determine the pins in a seven segment-display that will light each of the seven segments. Theory: The seven-segment display provides a way of expressing binary numbers in a decimal format. It is composed of seven small bars each of which is a LED. By knowing which segment to light, any digit from 0 through 9 can be formed. Pin 3 and pin 14 are connected to a +5v power source through a 220 Ω resistor. The chip schematic is shown below. +5V +5V Procedure: 1. Carefully insert the 7-segment display so that it straddles the centre groove of the breadboard. 2. Connect a 220 Ω resistor from pin 14 and pin 3 to D0 on the parallel port. Connecting pin 3 & 14 directly to +5v will damage the seven-segment display. One resistor should serve both pins. Note: Only two wires are connected to the 7-segment display chip at one time 3. Type this program into Turing. parallelput ( 1
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n. Seven Segment Display Lesson - 1COMPUTER ENGINEERING...

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