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fix #1305 by proposed workaround (thanks gaby64)

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This commit is contained in:
Steffen Vogel 2015-01-06 10:29:26 +01:00
parent f7e65935fb
commit df17a6a1b4
1 changed files with 8 additions and 0 deletions
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8
Marlin/scripts/createTemperatureLookupMarlin.py
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@ -43,6 +43,14 @@ class Thermistor:
x = (y2 - y1) / (l2 - l1) x = (y2 - y1) / (l2 - l1)
y = (y3 - y1) / (l3 - l1) y = (y3 - y1) / (l3 - l1)
c = (y - x) / ((l3 - l2) * (l1 + l2 + l3)) c = (y - x) / ((l3 - l2) * (l1 + l2 + l3))
b = x - c * (l1**2 + l2**2 + l1*l2)
a = y1 - (b + l1**2 *c)*l1
if c < 0:
print "//////////////////////////////////////////////////////////////////////////////////////"
print "// WARNING: negative coefficient 'c'! Something may be wrong with the measurements! //"
print "//////////////////////////////////////////////////////////////////////////////////////"
c = -c
self.c1 = a # Steinhart-Hart coefficients self.c1 = a # Steinhart-Hart coefficients
self.c2 = b self.c2 = b
self.c3 = c self.c3 = c