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Diffstat (limited to 'Tonokip_Firmware/createTemperatureLookup.py')
| -rw-r--r-- | Tonokip_Firmware/createTemperatureLookup.py | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/Tonokip_Firmware/createTemperatureLookup.py b/Tonokip_Firmware/createTemperatureLookup.py deleted file mode 100644 index e60a490..0000000 --- a/Tonokip_Firmware/createTemperatureLookup.py +++ /dev/null @@ -1,127 +0,0 @@ -#!/usr/bin/python -# -# Creates a C code lookup table for doing ADC to temperature conversion -# on a microcontroller -# based on: http://hydraraptor.blogspot.com/2007/10/measuring-temperature-easy-way.html -"""Thermistor Value Lookup Table Generator - -Generates lookup to temperature values for use in a microcontroller in C format based on: -http://hydraraptor.blogspot.com/2007/10/measuring-temperature-easy-way.html - -The main use is for Arduino programs that read data from the circuit board described here: -http://make.rrrf.org/ts-1.0 - -Usage: python createTemperatureLookup.py [options] - -Options: - -h, --help show this help - --r0=... thermistor rating where # is the ohm rating of the thermistor at t0 (eg: 10K = 10000) - --t0=... thermistor temp rating where # is the temperature in Celsuis to get r0 (from your datasheet) - --beta=... thermistor beta rating. see http://reprap.org/bin/view/Main/MeasuringThermistorBeta - --r1=... R1 rating where # is the ohm rating of R1 (eg: 10K = 10000) - --r2=... R2 rating where # is the ohm rating of R2 (eg: 10K = 10000) - --num-temps=... the number of temperature points to calculate (default: 20) - --max-adc=... the max ADC reading to use. if you use R1, it limits the top value for the thermistor circuit, and thus the possible range of ADC values -""" - -from math import * -import sys -import getopt - -class Thermistor: - "Class to do the thermistor maths" - def __init__(self, r0, t0, beta, r1, r2): - self.r0 = r0 # stated resistance, e.g. 10K - self.t0 = t0 + 273.15 # temperature at stated resistance, e.g. 25C - self.beta = beta # stated beta, e.g. 3500 - self.vadc = 5.0 # ADC reference - self.vcc = 5.0 # supply voltage to potential divider - self.k = r0 * exp(-beta / self.t0) # constant part of calculation - - if r1 > 0: - self.vs = r1 * self.vcc / (r1 + r2) # effective bias voltage - self.rs = r1 * r2 / (r1 + r2) # effective bias impedance - else: - self.vs = self.vcc # effective bias voltage - self.rs = r2 # effective bias impedance - - def temp(self,adc): - "Convert ADC reading into a temperature in Celcius" - v = adc * self.vadc / 1024 # convert the 10 bit ADC value to a voltage - r = self.rs * v / (self.vs - v) # resistance of thermistor - return (self.beta / log(r / self.k)) - 273.15 # temperature - - def setting(self, t): - "Convert a temperature into a ADC value" - r = self.r0 * exp(self.beta * (1 / (t + 273.15) - 1 / self.t0)) # resistance of the thermistor - v = self.vs * r / (self.rs + r) # the voltage at the potential divider - return round(v / self.vadc * 1024) # the ADC reading - -def main(argv): - - r0 = 10000; - t0 = 25; - beta = 3947; - r1 = 680; - r2 = 1600; - num_temps = int(20); - - try: - opts, args = getopt.getopt(argv, "h", ["help", "r0=", "t0=", "beta=", "r1=", "r2="]) - except getopt.GetoptError: - usage() - sys.exit(2) - - for opt, arg in opts: - if opt in ("-h", "--help"): - usage() - sys.exit() - elif opt == "--r0": - r0 = int(arg) - elif opt == "--t0": - t0 = int(arg) - elif opt == "--beta": - beta = int(arg) - elif opt == "--r1": - r1 = int(arg) - elif opt == "--r2": - r2 = int(arg) - - if r1: - max_adc = int(1023 * r1 / (r1 + r2)); - else: - max_adc = 1023 - increment = int(max_adc/(num_temps-1)); - - t = Thermistor(r0, t0, beta, r1, r2) - - adcs = range(1, max_adc, increment); -# adcs = [1, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 130, 150, 190, 220, 250, 300] - first = 1 - - print "// Thermistor lookup table for RepRap Temperature Sensor Boards (http://make.rrrf.org/ts)" - print "// Made with createTemperatureLookup.py (http://svn.reprap.org/trunk/reprap/firmware/Arduino/utilities/createTemperatureLookup.py)" - print "// ./createTemperatureLookup.py --r0=%s --t0=%s --r1=%s --r2=%s --beta=%s --max-adc=%s" % (r0, t0, r1, r2, beta, max_adc) - print "// r0: %s" % (r0) - print "// t0: %s" % (t0) - print "// r1: %s" % (r1) - print "// r2: %s" % (r2) - print "// beta: %s" % (beta) - print "// max adc: %s" % (max_adc) - print "#define NUMTEMPS %s" % (len(adcs)) - print "short temptable[NUMTEMPS][2] = {" - - counter = 0 - for adc in adcs: - counter = counter +1 - if counter == len(adcs): - print " {%s, %s}" % (adc, int(t.temp(adc))) - else: - print " {%s, %s}," % (adc, int(t.temp(adc))) - print "};" - -def usage(): - print __doc__ - -if __name__ == "__main__": - main(sys.argv[1:]) |