My Marlin configs for Fabrikator Mini and CTC i3 Pro B
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createTemperatureLookupMarlin.py 4.6KB

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  1. #!/usr/bin/python
  2. #
  3. # Creates a C code lookup table for doing ADC to temperature conversion
  4. # on a microcontroller
  5. # based on: http://hydraraptor.blogspot.com/2007/10/measuring-temperature-easy-way.html
  6. """Thermistor Value Lookup Table Generator
  7. Generates lookup to temperature values for use in a microcontroller in C format based on:
  8. http://hydraraptor.blogspot.com/2007/10/measuring-temperature-easy-way.html
  9. The main use is for Arduino programs that read data from the circuit board described here:
  10. http://make.rrrf.org/ts-1.0
  11. Usage: python createTemperatureLookup.py [options]
  12. Options:
  13. -h, --help show this help
  14. --rp=... pull-up resistor
  15. --t0=ttt:rrr low temperature temperature:resistance point (around 25C)
  16. --t1=ttt:rrr middle temperature temperature:resistance point (around 150C)
  17. --t2=ttt:rrr high temperature temperature:resistance point (around 250C)
  18. --num-temps=... the number of temperature points to calculate (default: 20)
  19. """
  20. from math import *
  21. import sys
  22. import getopt
  23. class Thermistor:
  24. "Class to do the thermistor maths"
  25. def __init__(self, rp, t1, r1, t2, r2, t3, r3):
  26. t1 = t1 + 273.15 # low temperature (25C)
  27. r1 = r1 # resistance at low temperature
  28. t2 = t2 + 273.15 # middle temperature (150C)
  29. r2 = r2 # resistance at middle temperature
  30. t3 = t3 + 273.15 # high temperature (250C)
  31. r3 = r3 # resistance at high temperature
  32. self.rp = rp # pull-up resistance
  33. self.vadc = 5.0 # ADC reference
  34. self.vcc = 5.0 # supply voltage to potential divider
  35. a1 = log(r1)
  36. a2 = log(r2)
  37. a3 = log(r3)
  38. z = a1 - a2
  39. y = a1 - a3
  40. x = 1/t1 - 1/t2
  41. w = 1/t1 - 1/t3
  42. v = pow(a1,3) - pow(a2,3)
  43. u = pow(a1,3) - pow(a3,3)
  44. c3 = (x-z*w/y)/(v-z*u/y)
  45. c2 = (x-c3*v)/z
  46. c1 = 1/t1-c3*pow(a1,3)-c2*a1
  47. self.c1 = c1
  48. self.c2 = c2
  49. self.c3 = c3
  50. def temp(self,adc):
  51. "Convert ADC reading into a temperature in Celcius"
  52. v = adc * self.vadc / (1024 * 16) # convert the 10 bit ADC value to a voltage
  53. r = self.rp * v / (self.vcc - v) # resistance of thermistor
  54. lnr = log(r)
  55. Tinv = self.c1 + (self.c2*lnr) + (self.c3*pow(lnr,3))
  56. return (1/Tinv) - 273.15 # temperature
  57. def adc(self,temp):
  58. "Convert temperature into a ADC reading"
  59. y = (self.c1 - (1/(temp+273.15))) / (2*self.c3)
  60. x = sqrt(pow(self.c2 / (3*self.c3),3) + pow(y,2))
  61. r = exp(pow(x-y,1.0/3) - pow(x+y,1.0/3)) # resistance of thermistor
  62. return (r / (self.rp + r)) * (1024*16)
  63. def main(argv):
  64. rp = 4700;
  65. t1 = 25;
  66. r1 = 100000;
  67. t2 = 150;
  68. r2 = 1641.9;
  69. t3 = 250;
  70. r3 = 226.15;
  71. num_temps = int(36);
  72. try:
  73. opts, args = getopt.getopt(argv, "h", ["help", "rp=", "t1=", "t2=", "t3=", "num-temps="])
  74. except getopt.GetoptError:
  75. usage()
  76. sys.exit(2)
  77. for opt, arg in opts:
  78. if opt in ("-h", "--help"):
  79. usage()
  80. sys.exit()
  81. elif opt == "--rp":
  82. rp = int(arg)
  83. elif opt == "--t1":
  84. arg = arg.split(':')
  85. t1 = float( arg[0])
  86. r1 = float( arg[1])
  87. elif opt == "--t2":
  88. arg = arg.split(':')
  89. t2 = float( arg[0])
  90. r2 = float( arg[1])
  91. elif opt == "--t3":
  92. arg = arg.split(':')
  93. t3 = float( arg[0])
  94. r3 = float( arg[1])
  95. elif opt == "--num-temps":
  96. num_temps = int(arg)
  97. max_adc = (1024 * 16) - 1
  98. min_temp = 0
  99. max_temp = 350
  100. increment = int(max_adc/(num_temps-1));
  101. t = Thermistor(rp, t1, r1, t2, r2, t3, r3)
  102. tmp = (min_temp - max_temp) / (num_temps-1)
  103. print tmp
  104. temps = range(max_temp, min_temp + tmp, tmp);
  105. print "// Thermistor lookup table for Marlin"
  106. print "// ./createTemperatureLookup.py --rp=%s --t1=%s:%s --t2=%s:%s --t3=%s:%s --num-temps=%s" % (rp, t1, r1, t2, r2, t3, r3, num_temps)
  107. print "#define NUMTEMPS %s" % (len(temps))
  108. print "short temptable[NUMTEMPS][2] = {"
  109. counter = 0
  110. for temp in temps:
  111. counter = counter +1
  112. if counter == len(temps):
  113. print " {%s, %s}" % (int(t.adc(temp)), temp)
  114. else:
  115. print " {%s, %s}," % (int(t.adc(temp)), temp)
  116. print "};"
  117. def usage():
  118. print __doc__
  119. if __name__ == "__main__":
  120. main(sys.argv[1:])