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import math
from time import sleep
import u6
# Coefficients
# -200 C to 0 C
# -5.891 mV to 0 mV
# 0.0E0
# 2.5173462E1
# -1.1662878E0
# -1.0833638E0
# -8.977354E-1
# -3.7342377E-1
# -8.6632643E-2
# -1.0450598E-2
# -5.1920577E-4
voltsToTemp1 = (0.0E0,
2.5173462E1,
-1.1662878E0,
-1.0833638E0,
-8.977354E-1,
-3.7342377E-1,
-8.6632643E-2,
-1.0450598E-2,
-5.1920577E-4)
# 0 C to 500 C
# 0 mV to 20.644 mV
# 0.0E0
# 2.508355E1
# 7.860106E-2
# -2.503131E-1
# 8.31527E-2
# -1.228034E-2
# 9.804036E-4
# -4.41303E-5
# 1.057734E-6
# -1.052755E-8
voltsToTemp2 = (0.0E0,
2.508355E1,
7.860106E-2,
-2.503131E-1,
8.31527E-2,
-1.228034E-2,
9.804036E-4,
-4.41303E-5,
1.057734E-6,
-1.052755E-8)
# 500 C to 1372 C
# 20.644 mV to 54.886 mV
# -1.318058E2
# 4.830222E1
# -1.646031E0
# 5.464731E-2
# -9.650715E-4
# 8.802193E-6
# -3.11081E-8
voltsToTemp3 = (-1.318058E2,
4.830222E1,
-1.646031E0,
5.464731E-2,
-9.650715E-4,
8.802193E-6,
-3.11081E-8)
def voltsToTempConstants(mVolts):
if mVolts < -5.891 or mVolts > 54.886:
raise Exception("Invalid range")
if mVolts < 0:
return voltsToTemp1
elif mVolts < 20.644:
return voltsToTemp2
else:
return voltsToTemp3
# -270 C to 0 C
# 0E0
# 0.39450128E-1
# 0.236223736E-4
# -0.328589068E-6
# -0.499048288E-8
# -0.675090592E-10
# -0.574103274E-12
# -0.310888729E-14
# -0.104516094E-16
# -0.198892669E-19
# -0.163226975E-22
tempToVolts1 = (0.0E0,
0.39450128E-1,
0.236223736E-4,
-0.328589068E-6,
-0.499048288E-8,
-0.675090592E-10,
-0.574103274E-12,
-0.310888729E-14,
-0.104516094E-16,
-0.198892669E-19,
-0.163226975E-22)
# 0 C to 1372 C
# -0.176004137E-1
# 0.38921205E-1
# 0.1855877E-4
# -0.994575929E-7
# 0.318409457E-9
# -0.560728449E-12
# 0.560750591E-15
# -0.3202072E-18
# 0.971511472E-22
# -0.121047213E-25
#
# 0.1185976E0
# -0.1183432E-3
# 0.1269686E3
class ExtendedList(list):
def __init__(self):
list.__init__(self)
self.extended = None
tempToVolts2 = ExtendedList()
tempToVolts2.append(-0.176004137E-1)
tempToVolts2.append(0.38921205E-1)
tempToVolts2.append(0.1855877E-4)
tempToVolts2.append(-0.994575929E-7)
tempToVolts2.append(0.318409457E-9)
tempToVolts2.append(-0.560728449E-12)
tempToVolts2.append(0.560750591E-15)
tempToVolts2.append(-0.3202072E-18)
tempToVolts2.append(0.971511472E-22)
tempToVolts2.append(-0.121047213E-25)
tempToVolts2.extended = (0.1185976E0, -0.1183432E-3, 0.1269686E3)
def tempToVoltsConstants(tempC):
if tempC < -270 or tempC > 1372:
raise Exception("Invalid range")
if tempC < 0:
return tempToVolts1
else:
return tempToVolts2
def evaluatePolynomial(coeffs, x):
tot = 0
y = 1
for a in coeffs:
tot += y * a
y *= x
return tot
def tempCToMVolts(tempC):
coeffs = tempToVoltsConstants(tempC)
if hasattr(coeffs, "extended"):
a0, a1, a2 = coeffs.extended
extendedCalc = a0 * math.exp(a1 * (tempC - a2) * (tempC - a2))
return evaluatePolynomial(coeffs, tempC) + extendedCalc
else:
return evaluatePolynomial(coeffs, tempC)
def mVoltsToTempC(mVolts):
coeffs = voltsToTempConstants(mVolts)
return evaluatePolynomial(coeffs, mVolts)
if __name__ == '__main__':
d = u6.U6()
d.getCalibrationData()
for i in range(10):
# The cold junction temperature
# Important: Must be in Celsius
CJTEMPinC = d.getTemperature() + 2.5 - 273.15
# The thermocouple's analog voltage
# Important: Must be in millivolts
TCmVolts = d.getAIN(0, resolutionIndex=8, gainIndex=3) * 1000
print("Cold Junction Temp: %s" % CJTEMPinC)
print("Voltage (in millivolts): %s" % TCmVolts)
totalMVolts = TCmVolts + tempCToMVolts(CJTEMPinC)
print("Temperature: %s\n" % mVoltsToTempC(totalMVolts))
sleep(1)