Subject:
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Re: GP2D02 - problems?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 1 Aug 2000 20:23:45 GMT
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Original-From:
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Stephan Adelsberger <ASTEPHAN@DEC1.WI-INF.spamcakeUNI-ESSEN.DE>
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Viewed:
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1482 times
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No, the GPD02 value is never zero.
Here is a table with my readings and the corresponding
distance.
distance value
in cm
110 68
100 70
90 71
80 72
75 74
70 75
65 76
60 79
55 81
50 83
45 87
40 91
35 97
30 106
25 117
20 135
15 167
10 233
This values may vary a bit. The sensor is designed for distances above 10 cm.
If the
distance < 10 cm, the values are useless (the values drop again).
However, there is a much more elegant solution
using the following formula by Ben Jackson (ben@ben.com):
> In lugnet.robotics.handyboard, Jean-Michel Mongeau writes:
> Does anyone how I could create a lookup table or an algorithm to convert the
> output of the Sharp GP2D02 (0 to 255 = byte) to values between 10 and 80 cm,
> which is the reading capability of the IR?
> You mean like value = 10 + ((70 * b) / 256) ?
A more precise formula from the same author is:
distance = 0.1233 * (1.0320^(float)GP2D02_15)+ 9.3078
(see: http://www.lugnet.com/robotics/handyboard/?n=7313).
For more infos and hints on sensors, especially on GP2D02, visit my home page
(http://dec1.wi-inf.uni-essen.de/~astephan/index/index_l.htm) and click on
sensors.
Hope this helps
Stephan Adelsberger
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Stephan Adelsberger
stephan@adelsberger.com
http://go.to/robot
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Message is in Reply To:
 | | GP2D02 - problems?
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| Hi all, I used Gary Livicks routine in connection with the GP2D02 Sensor. When there is no obstacle in front of the sensor the LDC shows: "range is 77". Is that normal. Shouldn't the LCD display zero? If it is normal can you say me why? Thank you (...) (24 years ago, 19-Jul-00, to lugnet.robotics.handyboard)
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