Copier Jam Detector Design Problem
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Design Specifications Copier Jam Detector Design Problem Design Specifications Digital Electronics 2.5 Programmable Logic - Combinational As the paper passes through a copy machine, three photo sensors monitor its path. The photo sensors consist of a phototransistor paired with an incandescent lamp. Photo Sensor Design Specifications for the Copier Jam Detector Design Problem Incandescent Lamp Phototransistor Test fixture for the three photo sensors constructed with fischertechnik® components. Project Lead The Way, Inc. Copyright 2009
Transcript of Copier Jam Detector Design Problem
Introduction to Sensors and Motors: Copier Jam Detector
DMS-FT or DLB-FTFischertechnik®
© 2014 Project Lead The Way, Inc.Digital Electronics
Design Specifications
As the paper passes through a copy machine, three photo sensors monitor its path. The photo sensors consist of a phototransistor paired with an incandescent lamp.
Phototransistor
Incandescent Lamp
Photo Sensor
Test fixture for the three photo sensors constructed with fischertechnik® components. 2
Design Specifications
As the paper passes through a copy machine, three photo sensors monitor its path. The photo sensors consist of a phototransistor paired with an incandescent lamp.
Phototransistor
Incandescent Lamp
Photo Sensor
Test fixture for the three photo sensors constructed with fischertechnik® components. 3
Design Specifications
When a paper breaks the light beam between a phototransistor and the incandescent lamp, the photo sensor outputs a logic one (1). When the beam is not broken (i.e., there is no paper), the photo sensor outputs a logic zero (0).
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Lamp
Photo-Transistor
Paper
Light
Paper = Logic 1 No Paper = Logic 0
Design Specifications
When a paper jam occurs, an LED indicator light will turn on and a buzzer will sound.
The LED indicator will go off as soon as the jam is cleared.
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The buzzer should continue to sound until a Clear button is pressed. This last condition requires that the output controlling the buzzer be latched with a flip-flop.
JAM Signal
CLEAR Signal
BUZZER
Design Specifications
Under normal operations, paper will pass through the sensors such that adjacent sensors will not simultaneously detect paper. If they detect paper, this indicates that a paper jam has occurred.
Shown are a few examples of both Jam and No Jam conditions.
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No Jam
Jam
Jam
No Jam
Complete Block Diagram
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Assignment
Using the Circuit Design Software (CDS):• Design a Copier Jam Detector circuit that meets the
design specifications detailed.
• Make the appropriated pin assignments so that your design will work with the Digital Logic Board (DLB).
• Build and test your design. Verify that the circuit is working as designed. If it is not, review your design to identify your mistakes, make the necessary corrections, and retest.
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