Subject:
|
Re: IR sensor question
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Thu, 6 Feb 1997 06:19:49 GMT
|
Original-From:
|
Fred G. Martin <fredm@media.#AvoidSpam#mit.edu>
|
Viewed:
|
1614 times
|
| |
|
|
As illustrated in the hb manual, the QRD and QRB sensors do NOT use
modulated IR light. the sensors as wired just turn on the IR emitter
like a little light bulb, and the received sensor value is a
combination of reflected IR light and general ambient light. I.E.,
these are very simple reflective IR sensors that do not attempt any
kind of modulation, and do not do anything to correct for ambient
light.
You can use as many of them as you have analog inputs. The
transmitter LED is wired in series with the 330 ohm resistor from the
HB's 5v supply exactly as illustrated. Built it as shown, plug it in,
and it will work, giving you simple range data out to about 2 inches.
To get best performance, physically shield the devices from ambient
room light.
-Fred
In your message you said:
>
>
> I have a very basic doubt regarding the working of the QRD114 sensor.
>
> If we connect the sensor as per the illustration in the
> handy board document, how do we make the emitter transmit IR
> waves?
>
> what will be the frequency of the IR beams (40kHz)?
>
> Moreover how many such sensors can be used with the present
> configuration -- is it equal to the # of available analog ports?
>
> am i way off and the solution is simple??
>
> cheers
> Sriram
>
>
|
|
Message is in Reply To:
 | | IR sensor question
|
| I have a very basic doubt regarding the working of the QRD114 sensor. If we connect the sensor as per the illustration in the handy board document, how do we make the emitter transmit IR waves? what will be the frequency of the IR beams (40kHz)? (...) (28 years ago, 6-Feb-97, to lugnet.robotics.handyboard)
|
2 Messages in This Thread:
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
