Subject:
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Infrared Sensors
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 25 Jun 1998 23:52:49 GMT
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Original-From:
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brian-c@AVOIDSPAMtechnologist.com
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Viewed:
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1891 times
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A few weeks back I was a little dissapointed in the performance of the QT
refective optosensors which come with the Handy Board because when using them on
the digital inputs, their range was only 1/4 to 1/2 inch or less.
Some people told me to use the Radio Shack type Infrared modules. This was
something I really frowned upon because I needed 5 sets of sensors, so this
would add up to alot of space.
If anyone is interested in using sensors on the digital inputs here's a way to
get a range of 3 to 3 1/2 inches, as opposed to 1/4 inch.
-----
I constructed my own sensor/emitter pairs from the following two Digikey parts:
L14N2QT-ND Infrared photo transistor
LN66-ND Infrared LED
The transistor is a 3 legged version so I removed the Base leg. Although if you
keep it on, you can attach a potentiometer to it and vary the sensitivity of the
sensor. (something I havent played with yet)
*also please note the emitter and collector legs are swapped, the emitter is the
leg with the tab on the outside of the can.
The wiring is straight forward. I used the same approach shown in the Handy
Board manual. The emitter was grounded, collector was wired to the signal input,
and the LED was limited with a 330 ohm resistor.
----
Anything within 3 to 3 1/2 inches gives a true result (0), everything else give
a false (1). The numbers are swapped but it works. :)
Hope someone finds this useful.
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Brian Carvalho [ brian-c@ieee.org ]
DeVRY Institute
New Jersey
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