VERSION CHANGE
NO.
ISSUE
APPROVED
The information disclosed herein was originated by and is the
property of MAZeT. MAZeT reserves all patent, proprietary, design,
use, sales, manufacturing an reproduction rights thereto. Product
names used in this publication are for identification purposes only
and may be trademark of their respective companies.
1
1.21
2002-12-18
Approvals
Date
MAZeT GmbH
Compiled:
2002-12-18
Checked:
2002-12-18
Status: valid
MAZeT GmbH Sales
Gschwitzer Strae 32
07745 JENA / GERMANY
Phone: +49 3641 2809-0
Fax: +49 3641 2809-12
E-Mail: sales@MAZeT.de
Url: http://www.MAZeT.de
Released:
2002-12-18
DOC. NO.: DB-99-093e
Page 1 of 11
Data Sheet
MCS-EB1
Color Sensor Evaluation Board
C-Version 1.4
1
Table of contents
1.
INTRODUCTION
2
2.
STARTUP
3
2.1 Included in delivery
3
2.2 System requirements
3
2.3 Connection of components
3
2.4 Software installation
4
3.
Hardware
4
3.1 Color sensor
4
3.2 Evaluation board
5
4.
C Software
6
5.
PC Software
7
5.1 Starting the software
7
5.2 Selection of serial interface
7
5.3 Graphical user screen
8
5.3.1
Measured value representation
8
5.3.2
Board set-ups
8
5.3.3
Starting a measurement
9
5.3.4
Black/white balancing
9
5.3.5
Color sensing
9
5.3.6
Averaging
10
5.3.7 Teaching a color
10
5.3.8
Interpretation of the color deviation
10
5.3.9 Interpretation in the Yxy system
10
5.3.10
Storage measured values
11
1
pertains to Evaluation-boards MCS-EB1 with delivery date after 1.8.2001, see also 2.4.
VERSION
NO.
ISSUE
APPROVED
1
1.21
2002-12-18
The information in this publication is believed to be accurate in all respects at the time
of publication. MAZeT reserves the right to make changes in its products without notice
in order to improve design or performance characteristics.
DOC. NO:
DB-99-093e
Page 2 of 11
DATA SHEET MCS-EB1
1.
INTRODUCTION
Industrial color sensing and monitoring is becoming easier. Where colors need to be
identified or comparative color measurement is performed with little effort and in a highly
dynamic environment, MAZeTs color sensor designs are just the right tool. Like the human
eye, sensors of this type use the three-range method for color detection.
Figure 1: MCS3AT color sensor with MCS-EB1 evaluation board
The MCS-EB1 provides an 8052-based C-platform. It is used to demonstrate the principle
of color detection with the help of the newly designed JENCOLOUR color sensors. The
color sensors are been embedded onto the evaluation board via adapters. The board is
applicable for all JENCOLOUR sensors MCS3Ax and MCSixT. In the standard delivery
version the MCS3AT is supplied. Alternatives are possible on request.
Four white light LEDs illuminate a test surface under an incident angle of 45 (approx.). At
a distance of 20 mm along the surface orthogonal, diffusely reflected light is detected and
digitized by the JENCOULOR color sensor.
For communication between the PC and the MCS-EB1, an RS232 interface is available. It
reads the sensor data and sets the required parameters.
Comfortable PC software allows manual gain selection for the current-voltage converter. In
addition to the 10-bit ADC output values obtained for the various RGB photocurrents, the
normalized color portions and mixed colors are represented in an intuitive manner.
The MCS-EB1 platform may also serve as an exemplary circuit application for composing
other simple color detection systems with JENCOLOUR color sensors.
VERSION
NO.
ISSUE
APPROVED
1
1.21
2002-12-18
The information in this publication is believed to be accurate in all respects at the time
of publication. MAZeT reserves the right to make changes in its products without notice
in order to improve design or performance characteristics.
DOC. NO:
DB-99-093e
Page 3 of 11
DATA SHEET MCS-EB1
2.
STARTUP
2.1
Included in delivery
Standard MCS-EB1s delivery includes the following components:
One MCS-EB1 (C version 1.4 and higher)
One MCS base adapter board
One MCS3xx three-element color sensor
One plug-in 7.5 V power pack
One RS232 cable
Two diskettes with installation software
One documentation set
2.2
System requirements
To perform sensor start-up, the following system requirements are necessary:
150 MHz or higher Pentium PC
Eight MB RAM
Five MB free memory space on hard-disk
One free serial interface
One 3.5" floppy disk drive
Windows9x or Windows/NT 4.0
2.3
Connection of component s
The sensor components must be connected as shown in this general system chart.
Figure 2: Connection of Eva-Board components
7,5 V Power supply unit
MCS3xx with adapter board
Colour sample
RS-232
MCS-EB1
220V
AC
VERSION
NO.
ISSUE
APPROVED
1
1.21
2002-12-18
The information in this publication is believed to be accurate in all respects at the time
of publication. MAZeT reserves the right to make changes in its products without notice
in order to improve design or performance characteristics.
DOC. NO:
DB-99-093e
Page 4 of 11
DATA SHEET MCS-EB1
2.4
Software installation
For the proper function of the MCS-EB1, the C-version 1.4 and higher (label on the
backside of the board) is requisite. To install the PC software, insert diskette 1 in a disk
drive of your PC. Start the "setup.exe" program and follow the installation instructions.
3.
HARDWARE
3.1
Color sensor
JENCOLOUR MCS3xx color sensors consist of 3 Si-PI N photodiodes integrated on chip.
They are designed as segments of a circle, which measures 2.0 mm in diameter. Si-PIN
photodiodes have been selected for operation with signal frequencies up to one MHz.
Dielectric color filters are integrated to sensitize each of the three photodiodes for a
particular color range, preferentially the basic colors of red, green and blue. In standard
version, each sensor is delivered in a TO5 package with transparent casting compound or
protective glass or in a SOP8 package with clear plastic cover. Other packaging types can
be customized on special request.
450
500
550
600
650
700
750
wave length
se
n
s
iti
v
ity (
A
/W)
blue
green
red
Figure 3: Typical spectral sensitivity graph of three-element color
For MCS3 sensors, dielectric color filters are used. These are directly located on the
photodiodes. The sensor thus forms a compact optical set-up. Since these filters reflect
light in the blocked color ranges, they are much more resistant to aging than color filters,
which are based on the absorption principle. Besides this, dielectric filters warrant high
temperature stability and resistance to environmental influences. This makes them
perfectly suited to perform stabile in applications with hard ambient conditions.
Because of their multi-layer stack set-up, filters of this kind can be employed to handle
different functions. For special applications (for example, restriction to a small color
range), the spectral filter characteristics can be matched to customer request
specifications.
In terms of contact points, each sensor provides an anode for the corresponding color
range and one common cathode. As with conventional photodiodes, the photocurrent can
be recorded and reprocessed with the help of simple amplifier circuitry.
VERSION
NO.
ISSUE
APPROVED
1
1.21
2002-12-18
The information in this publication is believed to be accurate in all respects at the time
of publication. MAZeT reserves the right to make changes in its products without notice
in order to improve design or performance characteristics.
DOC. NO:
DB-99-093e
Page 5 of 11
DATA SHEET MCS-EB1
3.2
Evaluation board
Figure 4: color sensor evaluation board MCS-EB1
Figure 5 represents a principal working diagram of the color sensor evaluation board.
Figure 5: Functioning of the MCS-EB1
Four white light LEDs under an angle of 45 illuminate the sample under test. The
JENCOLOUR color sensor detects the reflected light in the three color ranges of red,
green and blue. This occurs in a plane, which is perpendicular to the sample surface. Due
to the selected design arrangement of 45 for illumination and 90 for actual measurement,
it is also possible to measure more strongly reflecting surfaces. Various adapter board
modifications are available for matching to the requested packaging version.
A 4-channel transimpedance amplifier (see MAZeTs data sheet MTI04) transforms the
incoming photocurrents into equivalent voltages. Through selection of a suitable gain
factor the range of output voltages can be matched to the photocurrent to be measured.
Finally, the voltage signals are digitized in an AD converter.
A -controller handles all access operations to the various board components and
maintains communication with a PC. As part of these processes, AD values can be
transferred, required gain factors be set and illumination LEDs be turned on and off.
40 mm
spacer
RS232 interface
C-programming
port
C 8052
Terminal for
operating voltage
Adapter board for
JENCOLOUR-
colour sensor
White light LED`s
MTI04
MAZeT
R
U
Out
I
In
U
U
U
green
blue
red
CS3
I
I
green
blue
I
red
M
e
asu
r
i
ng
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b
j
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VREF
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