HDJD-JD07 Avago Technologies US Inc., HDJD-JD07 Datasheet - Page 7

• Manufacturer Part Number: HDJD-JD07
• Description: KIT DEV RGB DCS 2.2X2.2
• Manufacturer: Avago Technologies US Inc.

Specifications of HDJD-JD07

• Sensor Type: Light, Color Sensor
• Interface: USB
• Voltage - Supply: 2.5V
• Utilized Ic / Part: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Reflective Color Sensing Theory of Operation
By definition of reflective sensing, the color sensor
detects light reflected from a surface or an object. The
sensor module is designed in such a way that both the
light source and the color sensor are placed closed to
the target surface/object. Light coming from the LED
is bounced off a surface/object and measured by the
sensor. For a given light source, the color of light reflected
off a surface/object is a function of the surface/object
color. For example, white light incident onto a red surface
is reflected as red. Since any color is uniquely represented
by its R, G and B components, the sensor module effec-
tively measures the color of a surface/object by convert-
ing the R, G and B components of the reflected light to
digital value. In addition, given that the outputs increase
linearly with the intensity of reflected light, the sensor
also measures the reflectivity of a surface/ object where
the clear channel could be use for this purpose.
Transmissive Color Sensing Theory of Operation
By transmissive, it means the application kit is placed
facing the light source being measured. The filter-coated
photodiode array of the color sensor converts the R, G,
B components of light falling on it into photocurrent,
which is then converted into digital values for each of
the primary component. Given that any colored light is
uniquely represented by the ratio of the primary colors,
the color sensor provides a definite manner of measuring
color. In addition, the sensor is also responsive to
light intensity where its outputs increase linearly with
increasing light intensity. To measure the brightness of
the light source without the need to know the color, the
clear channel can be used.
For a given light source, the application kit can also be
used to determine the color of transparent medium
through which the light is passed before reaching the
sensor. For example, the medium could be glass, plastic
or liquid. To use HDJD-JD07 in transmissive mode, simply
turn off the white LED on the sensor module.

Figure 6. For a given light source, the color of reflected depends on surface/
object color
Figure 7. R, G, B outputs of the sensor is determined by color of light falling
on the sensor
Figure 8. Apply color sensor on media such as color filter, gas or liquid