This link has been bookmarked by 7 people . It was first bookmarked on 14 Jun 2007, by York Jong.
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12 May 12
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22 Jan 12
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18 Jul 11
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03 Dec 10
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14 Jun 07
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The Infrared emitter detector circuit is very useful if you plan to make a line following robot, or a robot with basic object or obstacle detection.
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Place the LED and detector an 1/8 to a 1/4 inch apart maximum, basically parallel and almost contacting.
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Aluminum foil covered with electrical tape works as a great shielding material.
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Many emitters are strong enough that if you aim the robot at a white wall, and turn off all other lights in the room, you can see how the IR light is projected from your robot. Good debugging aid.
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Output your IR values on your computer screen real time to optimize positioning and Pot calibration (depends on if you want range detection or white line detection).
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dark colors absorb more light than clear, so the dark LED is the detector
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The general rule of thumb with sunlight shielding is if you cannot see any data reading difference inside or outside, your sheilding is effective enough to work. Film canisters or electrical tape works very well. A modulated signal (such as in remote controls) also reduces external interference.
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Depending on resistor values, your IR circuit can be tweaked to better detect color instead of distance
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