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TOOLORIENTED LEARNING MODULS AND LABORATORY

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2D Travelling trolley. Plotter. Robot arm. Manchester 20. 08. 2002 Heinz-Dietrich Wuttke ... DEMO: TRAVELLING TROLLEY. Manchester 20. 08. 2002 Heinz ... – PowerPoint PPT presentation

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Title: TOOLORIENTED LEARNING MODULS AND LABORATORY

1
TOOL-ORIENTED LEARNING MODULS AND LABORATORY

TEACHING VIA INTERNET

2
OUTLINE

Concept of the Living Pictures
Demonstration PLD-programming
Concept of the web based laboratory
System architecture
Execution of the control algorithm
Observation of the hardware set-up
Conclusions / future work

3
DESIGN PROCESS

Functional description
Truth table
Boolean Expressions
Optimisation for Implementation
Minimisation
Analyse of Hazard
Implementation
Wired hardware
Programmable Hardware
Test
Laboratory work

? X gt Y
(x2 ? x3)
4
LIVING PICTURES

The Big Picture as user interface of applets
Rich exploration
possibilities
Generation of
own examples
Used in lectures
and at home
Tool in the
design process

5
LIVING PICTURES

Programmable logic devices
Input of
Equations
Truth table
Programmed
values
Differences between
ROM
PLA
PAL

6
LAB WORK

Good experiences with web-based learning material
Html-based scripts
Interactive worksheets living pictures
But no possibilities for laboratory work
Need of
Remote controlling and remote observation of real
processes
Dealing with integrated and interactive usage of
modern internet technologies
Better motivation for the students

7
WEB-BASED LABORATORY

Project FIPS
Ferngesteuertes Internet Praktikum
Schaltsysteme
Remote controlled laboratory for the course
Digital Logic Design

Real laboratory experiments in
Real laboratory surrounding
Supported by multimedia teaching and learning
material

8
DESIGN TASK
To be designed by the student
To be controlled by the students FSM
9
DESIGN RESULTS

Designing the Control Algorithm (FSM)
Automaton Graph
Next State Function
z0 xs z0 /z1 xs ..
z1 /xl /xs z0 /z2 .
z2 /xu xl /xs z0 .
Output Function
yl z1 /z2
yr z0 z2
yo /z0 /z1 /z2
yu z0 z1 /z0 /z1 z2

10
IMPLEMENTING THE DESIGN

To test his design, the student needs an
interface
to enter his created algorithm (z/y equations)
to handle the laboratory procedure (start / stop
/ reset)
to change environmental variables
to watch the laboratory procedure by
supervising the (model and environmental)
variables
observing the hardware model (via a WebCam)
to correct his algorithm at any time
Fault free solution step by step

Which system architecture is necessary for this ?
11
MAIN COMPONENTS
12
CLIENT SITE COMPONENTS
13
CLIENT ENTER THE DESIGN

Editor to enter the designed control algorithm

14
CLIENT MODEL CONTROL

Handling the laboratory procedure
Manually
Automatically
Start / Stop
Initializing

Depending on the model

15
CLIENT INITIAL SITUATION

Influencing the model variables

Depending on the model

16
CLIENT RUNNING PROCESS

Supervising actual parameters
model variables
environmental variables
automaton states
error messages

Depending on the model

17
CLIENT WATCH REALITY

Observation of the laboratory procedure
via a WebCam
(video camera with
Internet connectivity)

18
SERVER SITE COMPONENTS
19
EMBEDDED SYSTEM

Web based Embedded System (Beck-IPC)
Real time OS
Full TCP/IP-Stack
FTP-Server
Telnet-Server
Web-Server
Based on Intel 186
Realizing the communication
Exchanging all I/O variables

Digital IO
Beck-IPC
RS 232
Ethernet
20
HARDWARE MODELS

Main street crossing in Ilmenau
Plotter
Water reservoir
2D Travelling trolley
Robot arm
21
WEB-CAMERA

WebCam to observe the whole hardware setup
Models and surrounding
Additional information
(not available via the I/O interface)
Providing information in case of faulty behaviour

22
INTERPRETER PLACING
Where to place the interpreter ?

Client based
remote control

Server based
on the spot control

23
REMOTE CONTROL

INTERPRETER on client site
Exchange of I/O values via the Internet
Low network traffic
- No security in case of a network crash

24
ON THE SPOT CONTROL

INTERPRETER is running inside the embedded system
Download of the equations
Direct I/O data exchange on server site
In case of a network crash
Calculation can be finished
Ensures a definite reaction

25
SELF-PROTECTION

Models should be protected against wrong inputs
Hardware solution
Additional sensors
Server based software solution
Supervision of model input signals by the
Beck-IPC
(e.g. emergency motion stop on limit switch)
No additional sensors necessary
Client based software solution
Supervision of dont care conditions by the
interpreter
No wrong (model input) control signals

26
DEMO TRAVELLING TROLLEY
27
CONCLUSION

Students use LIVING PICTURES for exploring the
design process in different steps
Deeper understanding the design steps
Students execute their experiments (web based and
in the lab room) in the same surrounding
Increases the efficiency of laboratory resources
Reduces lab time
They will learn about possibilities and limits of
remote control and observation via Internet
Leads to a critical estimation of these
technologies

28
FUTURE WORK