Sensor line or proxymity functioning sensors are sensors that detect the color of dark or bright colors, dark or bright colors which are detected due to reflected light (usually using LED lamp) located on the sensor.
See picture (click to enlarge)
From the picture above we can conclude if the reflection of light on dark colored part is the reflection of light will be less and vice versa if the reflection of light on the bright colors will get a lot of light reflection is detected by the sensor. Sensor lines should not always use black and white to detect the presence of a line on the sensor, but other colors can also be used provided that its value can be distinguished by the sensor.
SENSOR COMPONENTS
The sensor lines can be made from various components including:
Blend of ultra-bright LED and LDR, which serves as the Tx LED and LDR function as Rx. Type sensor with this alloy can be set to obtain the proper intensity by adding potensio meters / trimpot (slide resistor).
Image component potensio meters
image by (http://www.tekniktv.co.cc/?p=3)
Figure LDR
Image of ultra bright LEDs
image by (indonetwork.co.id)
Here is an image sensor circuit with a line using the LED and LDR components:
image by (http://mcafif.files.wordpress.com/2008/06/gambar-rangkaian-sensor-dengan-menngunakan-ldr1.jpg)
The working principle of this circuit is if the LED light reflection on the part of colored light, the intensity of light entering the LDR (R2) will be high and the resistance (resistance to low) V0 consequently will have a high voltage so that its value becomes active, and vice versa if the reflection of LED light on the dark, then its value becomes passive.
The second type is a combination of IR LED and phototransistor, which serves as an IR LED and phototransistor as Rx Tx. When the signal line of LED light can be reflected transistors become active so that the output has a low voltage (close to 0 Volt / passive) output becomes high contrast (approximately 5 V / Off).
See this beriku picture.
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