Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

67 lines (56 sloc) 2.254 kB
// Thermistor lookup table for one thermistor or
// identical thermistors in all places.
/*
This table doesn't depend on the type of electronics, but on the type of
thermistor(s) you use. You want one table for each thermistor type you use.
*/
// How many thermistor tables we have.
#define NUMTABLES 1
// Names for our tables, so you can use them in config.h.
// Table numbering starts at 0.
#define THERMISTOR_EXTRUDER 0
/*
You may be able to improve the accuracy of this table in various ways.
1. Measure the actual resistance of the resistor. It's "nominally" 4.7K,
but that's ± 5%.
2. Measure the actual beta of your thermistor:
http://reprap.org/wiki/MeasuringThermistorBeta
3. Generate more table entries than you need, then trim down the ones
in uninteresting ranges.
In either case you'll have to regenerate this table with
createTemperatureLookup.py, which requires python, which is difficult to
install on windows. Since you'll have to do some testing to determine the
correct temperature for your application anyway, you may decide that the
effort isn't worth it. Who cares if it's reporting the "right" temperature
as long as it's keeping the temperature steady enough to print, right?
*/
// The number of value pairs in our table.
// Must be the same for all tables.
#define NUMTEMPS 20
uint16_t const temptable[NUMTABLES][NUMTEMPS][2] PROGMEM = {
// Table for the Extruder.
// Thermistor: unknown
// ./createTemperatureLookup.py --r0=100000 --t0=25 --r1=0 --r2=4700 --beta=4066 --max-adc=1023
{
{1, 3364}, // 841.027617469 C
{21, 1329}, // 332.486789769 C
{41, 1104}, // 276.102666373 C
{61, 987}, // 246.756060004 C
{81, 909}, // 227.268080588 C
{101, 851}, // 212.78847342 C
{121, 805}, // 201.30176775 C
{141, 767}, // 191.787692666 C
{161, 734}, // 183.662212795 C
{181, 706}, // 176.561442671 C
{201, 680}, // 170.244089549 C
{221, 658}, // 164.542298163 C
{241, 637}, // 159.33475843 C
{321, 567}, // 141.921298995 C
{381, 524}, // 131.166509425 C
{581, 406}, // 101.561865389 C
{781, 291}, // 72.9710018071 C
{881, 219}, // 54.8051659223 C
{981, 93}, // 23.4825243529 C
{1010, 1} // 0.498606463441 C
}
};
Jump to Line
Something went wrong with that request. Please try again.