Subject:
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Re: IR Port as Proximity detector.
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 8 Jan 1999 08:05:59 GMT
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Original-From:
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Nick Taylor <ntaylor@iname.com>
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Viewed:
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1522 times
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David .....
Thanks for sharing ... it's a great idea!!!
- - - Nick - - -
David Chen wrote:
> Someone (Can't remember who, so unfortunately unable to give credit for
> the idea appropriately) posted the fact that the IR port used as a
> emitter coupled with the Light Sensor unit as the reciever can be used
> as a IR proximity sensor.
>
> Seemed like a good idea. Had not heard of it done before on this news
> group. Thought I'd give it a try.
>
> NQC code as follows for a test program called Ping.
>
> /*
> * Ping
> * ===========
> * Reads light level into level, transmitts it out via SendMessage.
> *
> * Mapping:
> * OUT_A: empty
> * OUT_B: empty
> * OUT_C: empty
> * IN_1: empty
> * IN_2: light sensor
> * IN_3: empty
> *
> */
>
> #define THRESHOLD 70
>
> int level;
>
> task Ping
>
> {
> while(true)
> {
> level = Input(1);
> if(level > THRESHOLD)
> PlaySound(1);
> SendMessage(level);
> }
> }
>
> task main
> {
> // Set up the sensors
> Sensor(IN_2,IN_CFG(STYPE_LIGHT, SMODE_PERCENT));
>
> // Start Tasks
> start Ping;
> }
>
> This has the RCX sending infrared pulses out constantly, if the
> reflected pulse is > THRESHOLD (arbitrary values, see below), then it
> beeps.
>
> THRESHOLD values I have found to cause beeps when Light Sensor is within
> the following distances to a wall painted white (flat wall indoor
> paint). Your milage may vary depending on ambient light.
>
> Threshold: 75 70 60 55-
>
> Range: 6" 4" 3" Triggers constantly at with the
> ambient light.
>
> Perhaps a routine to adjust for Threshold = average ambient level + 20
> would work?
>
> Whoever's idea this was, it was a brilliant one. Now you have an IR
> object detector/range detector to use along with your 2 touch sensors.
> I can now use the touch sensors for side collision detection and IR
> sensor for front.
>
> Next, use a 3rd motor for side to side scanning of objects...
>
> Dave Chen
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: IR Port as Proximity detector.
|
| Oops, noticed a coding error, the line that says: level = Input(1); Should read: level = IN_2; For better readability. The original version works b/c IN_2 is #defined already as Input(1); but the latter is more readable. I have used this (...) (26 years ago, 8-Jan-99, to lugnet.robotics)
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Message is in Reply To:
| | IR Port as Proximity detector.
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| Someone (Can't remember who, so unfortunately unable to give credit for the idea appropriately) posted the fact that the IR port used as a emitter coupled with the Light Sensor unit as the reciever can be used as a IR proximity sensor. Seemed like a (...) (26 years ago, 8-Jan-99, to lugnet.robotics)
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