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