Copier Jam Detector Design Problem
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Introduction to Sensors and Motors: Copier Jam Detector
DMS-FT or DLB-FTFischertechnik®
© 2014 Project Lead The Way, Inc.Digital Electronics
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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
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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
![Page 4: Copier Jam Detector Design Problem](https://reader038.fdocuments.in/reader038/viewer/2022100505/5a4d1b4c7f8b9ab0599a5fae/html5/thumbnails/4.jpg)
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
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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
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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
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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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