DMSFT or DLBFT Fischertechnik 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 ID: 450471
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Slide1
Introduction to Sensors and Motors: Copier Jam DetectorDMS-FT or DLB-FTFischertechnik®
© 2014 Project Lead The Way, Inc.
Digital ElectronicsSlide2
Design SpecificationsAs 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
.
2Slide3
Design SpecificationsAs 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
.
3Slide4
Design SpecificationsWhen 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). 4
Lamp
Photo-Transistor
Paper
Light
Paper = Logic 1
No Paper = Logic 0Slide5
Design SpecificationsWhen 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. 5The 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 SignalCLEAR Signal
BUZZERSlide6
Design SpecificationsUnder 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.6
No Jam
Jam
Jam
No JamSlide7
Complete Block Diagram7Slide8
AssignmentUsing 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. 8