Subject:
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RE: RCX Temperature Algorithm
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 16 Mar 2000 14:06:05 GMT
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Viewed:
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2042 times
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> Back when everybody was reverse engineering the RCX software, did anybody
> figure out the code that is used to convert the a/d value into a
> temperature?
Mike,
Here's the area of interest right out of Kekoa's listing from the
internals document...I don't have time to totally decode it, but
maybe if you put down your soldering iron... :-)
case a0: // temperature in degrees C
case c0: // temperature in degrees F
if (raw >= 3a0 || raw < 122)
sensor->value = 7fff
else if (raw < 154)
scale = fffffefb
offset = 00023730
else if (raw < 186)
scale = ffffff3e
offset = 0001e078
else if (raw < 1de)
scale = ffffff70
offset = 0001944c
else if (raw < 208)
scale = ffffff85
offset = 00016da0
else if (raw < 316)
scale = ffffff95
offset = 00014cd0
else if (raw < 376)
scale = ffffff7a
offset = 0001a068
else
scale = ffffff51
offset = 00022d08
temp = (raw * scale + offset) / 100
if (sensor->mode & 0e == 0a)
// temperature in degrees C
sensor->value = temp
else
// temperature in degrees F
sensor->value = degf = (temp * 12) / 0a + 140
sensor->boolean = boolean
Hope this helps....
Cheers,
Ralph Hempel - P.Eng
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Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbFORTH>
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Message is in Reply To:
 | | RCX Temperature Algorithm
|
| Back when everybody was reverse engineering the RCX software, did anybody figure out the code that is used to convert the a/d value into a temperature? (25 years ago, 16-Mar-00, to lugnet.robotics.rcx)
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