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TCS3200-DB (#28302):
Color Sensor Module
Product Overview
General Description
TCS3200-DB Color Sensor Daughterboard is a complete color detector, including a TAOS TCS3200 RGB
sensor chip, white LEDs, collimator lens, and standoffs to set the optimum sensing distance. It plugs
directly into the BASIC Stamp-2pe Motherboard (#28300), Propeller Backpack (#28327), MoBoProp
(#28303, a future product) and will also interface to any BASIC Stamp module or Propeller board using
the optional DB-Expander SIP Converter (#28325). The TCS3200-DB can detect and measure a nearly
limitless range of visible colors.
The TCS3200 has an array of photodetectors, each with either a red, green, or blue filter, or no filter
(clear). The filters of each color are distributed evenly throughout the array to eliminate location bias
among the colors. Internal to the device is an oscillator which produces a square-wave output whose
frequency is proportional to the intensity of the chosen color.
Features
•
•
•
•
•
Sensor provides a readout of individual RGB color components as a digital frequency.
Onboard white LEDs can be gated on and off for ambient light subtraction.
The included 5.6mm lens provides a well-defined field of view.
Module is plug-compatible with Parallax motherboards.
Module can run from 3.3V or 5V logic supplies, plus 5V for the LED.
Applications
•
•
•
•
Test strip reading.
Sorting by color.
Ambient light sensing and calibration.
Color matching.
What’s Included
TSL3200-DB with lens, standoffs,
and screws.
What You Need to Provide
•
Parallax motherboard, or DB-Expander in conjunction with a BASIC Stamp or Propeller chip.
TCS3200-DB (January 21, 2010)
Page 1 of 7
© Parallax, Inc.
Out of the Box
The TCS3200-DB Color Sensor Daughterboard Kit consists of a TCS3200-DB daughterboard that includes
the TAOS TCS3200 color sensor chip, a lens, and two current-regulated white LEDs. Also included are
four one-inch aluminum standoffs and four 3/4" screws.
The daughterboard is compatible with all Parallax motherboards, including the MoBoStamp-pe, Propeller
Backpack, and the upcoming MoBoProp. It can operate with Vdd set anywhere between 2.7V and 5.5V.
However, a nominal 5V supply is needed for operation of the LEDs, which the motherboards
automatically provide. For operation without a motherboard, such as with Parallax's Board of Education or
Propeller Demo Board, an extension cable (p/n 800-28301) and a SIP adapter ("DB Expander", p/n
28325) are available separately to convert the TCS3200DB's two-row, 2mm header to a more convenient
single-row, 0.1-inch spacing.
Getting Started
If you are using the TCS3200-DB with the MoBoStamp-pe, make sure that you have the GPIO3 firmware
loaded into the AVR coprocessors. The MoboStamp-pe comes from the factory with the GPIO3 firmware
installed. If you have installed other AVR firmware, reload the GPIO3 hex file using the LoadAVR.exe
utility before proceeding.
The TCS3200-DB works best with the front surface of the printed circuit board located between 1" and 1
1/16" from the subject being sensed. For this reason, aluminum spacers are included, which can be
affixed to form legs. If you are using your TCS3200-DB with a Parallax motherboard, remove all the
screws from the brass spacers at both ends of the board, and replace them with the 3/4" screws included
in this kit. The screws should be installed from the bottom of the motherboard and protrude through the
brass spacers. At this point, you can install the TCS3200-DB on the "B" end of the motherboard and
attach the spacers as shown below. The left-over short screws may also be screwed into the ends of the
legs as a height adjustment.
If you are connecting the TCS3200-DB to the motherboard via the extension cable (p/n 800-28301),
attach the spacers directly to the TCS3200-DB using the unused short screws provided with the
motherboard.
If you are using the TCS3200-DB with the DB-Expander instead of a motherboard, you will need to obtain
eight 4-40 x 1/4" panhead machines screws (Parallax p/n 700-00028) to attach the legs and to use as a
height adjustment, since the 3/4" screws provided are too long.
© Parallax, Inc.
TCS3200-DB (January 21, 2010)
Page 2 of 7
Now, assuming you're using the MoBoStamp-pe, key the following BS2pe program into the BASIC Stamp
Editor. (A similar program, along with programs for different BASIC Stamp versions is available for
download at
www.parallax.com
on the TCS3200-DB product page.)
'{$STAMP BS2pe}
Out
S3
S2
LED
CON
CON
CON
CON
7
0
1
5
pRED
CON 15
pGREEN CON 12
pBLUE CON 9
RED
GREEN
BLUE
Start:
HIGH
VAR Word
VAR Word
VAR Word
LED
MainLp:
GOSUB Color
DEBUG "R", DEC3 RED
DEBUG " G", DEC3 GREEN
DEBUG " B", DEC3 BLUE
DEBUG CR
GOTO MainLp
Color:
LOW S2
LOW S3
COUNT Out, pRED, RED
HIGH S3
COUNT Out, pBLUE, BLUE
HIGH S2
COUNT Out, pGREEN, GREEN
RETURN
Next, connect the motherboard to your PC, and Run the program you've entered. Two things should now
happen: 1) the white LEDs on the sensor module will come on, and 2) you will see output appear in the
debug window that looks something like this:
R123 G065 B200
R120 G060 B187
etc.
These numbers are relative values for the red, green, and blue components of the color the sensor is
looking at. With the TCS3200-DB perched on its legs atop a piece of white paper, you will notice that the
LEDs form a bright spot of light in front of the lens. You may need to adjust the LEDs or the height a bit
to make sure that the spots from both LEDs merge into a single round spot.
Hardware Notes
No technical discussion of the TCS3200 sensor module set would be complete without the material
contained in the TAOS TCS3200 datasheet. If you do not have this datasheet, you are encouraged to
download it from the TAOS website,
www.taosinc.com.
© Parallax, Inc.
TCS3200-DB (January 21, 2010)
Page 3 of 7
The TCS3200 has an array of photodetectors, each with either a red, green, or blue filter, or no filter
(clear). The filters of each color are distributed evenly throughout the array to eliminate location bias
among the colors. Internal to the device is an oscillator which produces a square-wave output whose
frequency is proportional to the intensity of the chosen color. There is one output from this oscillator, and
the color to be read is selected using two address lines:
S2
and
S3.
In addition, it is possible to program
the divide rate of the oscillator using two additional lines,
S0
and
S1.
The settings for these control lines
and their functions are summarized below:
S0
0
0
1
1
S1
0
1
0
1
Divide
Pwr. Down
1:50
1:5
1:1
S2
0
0
1
1
S3
0
1
0
1
Color
Red
Blue
Clear
Green
The TCS3200 chip's data and control lines are brought directly to the 2mm header, through which it
interfaces to the motherboard or to another system. The only exception is the
/OE
output enable line,
which is permanently asserted low. In addition, both
S0
and
S1
are pulled high through resistors to Vdd,
which programs the TCS3200 for its maximum output frequency. Therefore, to use this setting, neither
S0
nor
S1
need to be connected. There are also jumper pads on the TCS3200-DB by which either
S0
or
S1,
or both, can be strapped low.
To program the data rate from a BASIC Stamp, it will be necessary to connect
S0
and
S1
to a
programmable port. On the MoBoStamp-pe, this must be done through the AVR coprocessor via the
OWOUT
instruction, since these signals do not connect directly to the BASIC Stamp chip. To set
S0
and
S1
to the values (0 or
1)
contained in variables of the same name, use the following PBASIC code:
OWOUT OWIO, 0, [$04 + S0, $14 + S1]
where the value for
OWIO
is given in the table below.
The following table maps the TCS3200-DB signals to ports on both the MoBoStamp-pe and MoBoProp
boards for sockets A and B, the Propeller Backpack, as well as the DB-Expander board:
Signal
S0
S1
S2
S3
OUT
LED
OWIO
MoBoStamp-pe
A
B
See code above.
See code above.
P9
P1
P8
P0
P11
P7
P12
P5
P10
P6
MoBoProp A
A9
A8
A12
A13
A10
A11
MoBoProp B
or Backpack
A1
A0
A4
A5
A2
A3
—Not Applicable—
DB-
Expander
B
A
E
F
C
D
When operating the TCS3200-DB using the SIP adapter (DB-Expander) instead of a Parallax
motherboard, the correspondence between the signals and SIP pin markings will be that of the last
column in the table above. When operated in this fashion, the
+5V
pin supplies power to the LEDs and
must be at least 4.5V for good current regulation and never more than 7.5V. The
Vdd
pin supplies the
rest of the board and can range anywhere from 2.7V to 5.5V. In any event, the
LED
enable input must
be at least 2.0V to turn the LEDs on. Other signal level requirements can be obtained from the TCS3200
datasheet.
© Parallax, Inc.
TCS3200-DB (January 21, 2010)
Page 4 of 7
Optical Data
With the supplied 5.6mm lens and a subject distance of 1" (25mm) from the front surface of the circuit
board, the sensor module will "see" a square area roughly 9/64" (3.5mm) on a side. This means that any
color variation within an area that size will be averaged by the TCS3200.
The spectral response of any color sensor system is a function not only of the sensor's device response,
but also of the system's optics and illumination. The combined response of this module to emissive
sources, taking into account the lens' IR filter, is approximated by the curves below:
TCS3200 Relative Emissive Spectral Response with IR Filter
1.00
0.90
0.80
0.70
Relative Response
Clear Photodiodes
Red Photodiodes
Green Photodiodes
Blue Photodiodes
0.60
0.50
0.40
0.30
0.20
0.10
0.00
350
400
450
500
550
600
650
700
750
800
850
900
950 1000 1050 1100
Wavelength (nm )
When the above is combined with the spectrum of the white LEDs for reflective subjects, the response
curve looks more like this:
TCS3200 Relative Reflective Spectral Response with IR Filter
and White LED Illumination
1.00
0.90
0.80
0.70
Relative Response
Clear Photodiodes
Red Photodiodes
Green Photodiodes
Blue Photodiodes
0.60
0.50
0.40
0.30
0.20
0.10
0.00
350
400
450
500
550
600
650
700
750
800
850
900
950 1000 1050 1100
Wavelength (nm )
© Parallax, Inc.
TCS3200-DB (January 21, 2010)
Page 5 of 7
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