CONTENT:
In order to ensure about the connection, I have try test the circuit on a breadboard first. To make the IR LED work well, I have increased the current to the LED to almost 50mA which is the maximum continuous current allowed. Because the LED is pulse on and off, this is quite safe and could have been increased to 100mA. To know how wide the detection area is, I used my hand as the object at the distance of approximately 300mm (12inches) from the single sensor, the detection area is about 150mm (6inches) wide. The double sensor can detect a wider area if the phototransistor are spread out at different angle. Using my hand side on the single sensor, the detection area was only about 60-70mm (2-3 inches). This is reasonably narrow due to the lenses in the LEDs and phototransistor. It should be noted that this is not a linear sensor because the intensity of light from the LEDs is 1 divided by distance squared. In other words, when the object is twice the distance away, the IR from the LED is 1/4. As a result,the closer the object, the better the resolution.
OBJECTIVES:
- To test about the connection is correct or not..
- To see whether it can function well or not..
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