67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
// Thermistor lookup table for one thermistor or
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// identical thermistors in all places.
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/*
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This table doesn't depend on the type of electronics, but on the type of
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thermistor(s) you use. You want one table for each thermistor type you use.
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*/
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// How many thermistor tables we have.
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#define NUMTABLES 1
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// Names for our tables, so you can use them in config.h.
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// Table numbering starts at 0.
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#define THERMISTOR_EXTRUDER 0
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/*
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You may be able to improve the accuracy of this table in various ways.
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1. Measure the actual resistance of the resistor. It's "nominally" 4.7K,
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but that's ± 5%.
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2. Measure the actual beta of your thermistor:
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http://reprap.org/wiki/MeasuringThermistorBeta
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3. Generate more table entries than you need, then trim down the ones
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in uninteresting ranges.
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In either case you'll have to regenerate this table with
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createTemperatureLookup.py, which requires python, which is difficult to
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install on windows. Since you'll have to do some testing to determine the
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correct temperature for your application anyway, you may decide that the
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effort isn't worth it. Who cares if it's reporting the "right" temperature
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as long as it's keeping the temperature steady enough to print, right?
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*/
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// The number of value pairs in our table.
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// Must be the same for all tables.
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#define NUMTEMPS 20
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const uint16_t PROGMEM temptable[NUMTABLES][NUMTEMPS][2] = {
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// Table for the Extruder.
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// Thermistor: unknown
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// ./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700 --beta=4066 --max-adc=1023
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{
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{1, 3364}, // 841.027617469 C
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{21, 1329}, // 332.486789769 C
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{41, 1104}, // 276.102666373 C
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{61, 987}, // 246.756060004 C
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{81, 909}, // 227.268080588 C
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{101, 851}, // 212.78847342 C
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{121, 805}, // 201.30176775 C
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{141, 767}, // 191.787692666 C
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{161, 734}, // 183.662212795 C
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{181, 706}, // 176.561442671 C
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{201, 680}, // 170.244089549 C
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{221, 658}, // 164.542298163 C
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{241, 637}, // 159.33475843 C
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{321, 567}, // 141.921298995 C
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{381, 524}, // 131.166509425 C
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{581, 406}, // 101.561865389 C
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{781, 291}, // 72.9710018071 C
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{881, 219}, // 54.8051659223 C
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{981, 93}, // 23.4825243529 C
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{1010, 1} // 0.498606463441 C
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}
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};
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