1. Copier Jam Detector Design Problem
Digital Electronics
2.5 Programmable Logic - Combinational
Introduction to Sensors and Motors: Copier Jam Detector
DMS-FT or DLB-FT
Fischertechnik®
Digital Electronics
© 2014 Project Lead The Way, Inc.
Project Lead The Way, Inc.
Copyright 2009

2. 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

3. 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

4. Design Specifications
Copier Jam Detector Design Problem
Digital Electronics
2.5 Programmable Logic - Combinational
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).
Design Specifications for the Copier Jam Detector Design Problem
Lamp
Photo-Transistor
Paper
Light
Paper = Logic 1
No Paper = Logic 0
Project Lead The Way, Inc.
Copyright 2009

5. Design Specifications
Copier Jam Detector Design Problem
Digital Electronics
2.5 Programmable Logic - Combinational
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.
BUZZER
JAM Signal
CLEAR Signal
Design Specifications for the Copier Jam Detector Design Problem
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.
Project Lead The Way, Inc.
Copyright 2009

6. Design Specifications
Copier Jam Detector Design Problem
Design Specifications
Digital Electronics
2.5 Programmable Logic - Combinational
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.
No Jam
Jam
Design Specifications for the Copier Jam Detector Design Problem
Jam
No Jam
Project Lead The Way, Inc.
Copyright 2009

7. Complete Block Diagram
Copier Jam Detector Design Problem
Digital Electronics
2.5 Programmable Logic - Combinational
Complete Block Diagram / Schematic for the Copier Test Fixture
Project Lead The Way, Inc.
Copyright 2009

8. Copier Jam Detector Design Problem
Assignment
Digital Electronics
2.5 Programmable Logic - Combinational
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.
Review of Project Assignment
Project Lead The Way, Inc.
Copyright 2009