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more cleanups

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This commit is contained in:
Steffen Vogel 2015-01-06 10:27:40 +01:00
parent 95f4a55820
commit 81363bc441
1 changed files with 15 additions and 15 deletions
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30
Marlin/scripts/createTemperatureLookupMarlin.py
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@ -12,9 +12,9 @@ Usage: python createTemperatureLookup.py [options]
Options:
-h, --help show this help
--rp=... pull-up resistor
--t1=ttt:rrr low temperature temperature:resistance point (around 25C)
--t2=ttt:rrr middle temperature temperature:resistance point (around 150C)
--t3=ttt:rrr high temperature temperature:resistance point (around 250C)
--t1=ttt:rrr low temperature temperature:resistance point (around 25 degC)
--t2=ttt:rrr middle temperature temperature:resistance point (around 150 degC)
--t3=ttt:rrr high temperature temperature:resistance point (around 250 degC)
--num-temps=... the number of temperature points to calculate (default: 36)
"""
@ -50,25 +50,24 @@ class Thermistor:
self.c3 = c
self.rp = rp # pull-up resistance
def res(self, adc):
def resol(self, adc):
"Convert ADC reading into a resolution"
res = self.temp(adc)-self.temp(adc+1)
return res
def v(self, adc):
def voltage(self, adc):
"Convert ADC reading into a Voltage"
return adc * VSTEP # convert the 10 bit ADC value to a voltage
def r(self, adc):
def resist(self, adc):
"Convert ADC reading into a resistance in Ohms"
r = self.rp * self.v(adc) / (VCC - self.v(adc)) # resistance of thermistor
r = self.rp * self.voltage(adc) / (VCC - self.voltage(adc)) # resistance of thermistor
return r
def temp(self, adc):
"Convert ADC reading into a temperature in Celcius"
r = self.rp * self.v(adc) / (VCC - self.v(adc)) # resistance of thermistor
lnr = log(r)
Tinv = self.c1 + (self.c2*lnr) + (self.c3*pow(lnr,3))
l = log(self.resist(adc))
Tinv = self.c1 + self.c2*l + self.c3*pow(l,3) # inverse temperature
return (1/Tinv) - ZERO # temperature
def adc(self, temp):
@ -87,7 +86,7 @@ def main(argv):
t3 = 250 # high temperature in Kelvin (250 degC)
r3 = 226.15 # resistance at high temperature (226.15 Ohm)
rp = 4700; # pull-up resistor (4.7 kOhm)
num_temps = int(36); # number of entries for look-up table
num_temps = 36; # number of entries for look-up table
try:
opts, args = getopt.getopt(argv, "h", ["help", "rp=", "t1=", "t2=", "t3=", "num-temps="])
@ -130,11 +129,12 @@ def main(argv):
print "const short temptable[NUMTEMPS][2] PROGMEM = {"
for temp in temps:
print " { (short) (%7.2f * OVERSAMPLENR ), %s\t}%s // v=%.3f\tr=%.3f\tres=%.3f degC/count" % ( t.adc(temp), temp, \
adc = t.adc(temp)
print " { (short) (%7.2f * OVERSAMPLENR ), %4s }%s // v=%.3f\tr=%.3f\tres=%.3f degC/count" % (adc , temp, \
',' if temp != temps[-1] else ' ', \
t.v( t.adc(temp)), \
t.r( t.adc(temp)), \
t.res(t.adc(temp)) \
t.voltage(adc), \
t.resist( adc), \
t.resol( adc) \
)
print "};"