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257 changes: 128 additions & 129 deletions pt100rtd.h
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Original file line number Diff line number Diff line change
@@ -1,15 +1,15 @@
/*******************************************************************
PT100RTD

This library uses integer math to convert a Pt100 RTD resistance to a
celsius temperature of two decimal point precision.

It searches an ordered list of empirical resistances which correspond to
temperatures ranging -200C to +850C, the complete span for which 100 ohm
platinum RTDs are specified. It interpolates temperatures from intermediate
resistances.
AUTHOR: drh

AUTHOR: drh

DATE:2/18/2017

Expand All @@ -31,9 +31,9 @@
#endif

#if (ARDUINO >= 100)
#include "Arduino.h"
#include "Arduino.h"
#else
#include "WProgram.h"
#include "WProgram.h"
#endif


Expand All @@ -42,140 +42,140 @@
#define CELSIUS_MAX 850

/*******************************************************************
* pt100rtd list of resistances v temperature
*
* DIN 43760 resistance values (ohms) were multiplied by 100 and
* converted to 16 bit unsigned integers with no loss of accuracy.
*
* Examples:
* 1852 represents 18.52 ohms and corresponds to a temperature of -200C.
* 10000 ==> 100.00 ohms @ 0C
* 13851 ==> 138.51 ohms @ 100C
*
* The list resides in flash since it's too large for SRAM or EEPROM
pt100rtd list of resistances v temperature

DIN 43760 resistance values (ohms) were multiplied by 100 and
converted to 16 bit unsigned integers with no loss of accuracy.

Examples:
1852 represents 18.52 ohms and corresponds to a temperature of -200C.
10000 ==> 100.00 ohms @ 0C
13851 ==> 138.51 ohms @ 100C

The list resides in flash since it's too large for SRAM or EEPROM
*******************************************************************/

const static uint16_t Pt100_table[1051] PROGMEM = {
1852, 1896, 1939, 1982, 2025, 2068, 2111, 2154, 2197, 2240,
2283, 2326, 2369, 2412, 2455, 2497, 2539, 2582, 2625, 2667,
2710, 2752, 2795, 2837, 2880, 2922, 2965, 3007, 3049, 3092,
3134, 3176, 3218, 3261, 3303, 3345, 3386, 3428, 3470, 3512,
3554, 3596, 3638, 3680, 3722, 3763, 3805, 3847, 3889, 3931,
3972, 4014, 4056, 4097, 4139, 4180, 4222, 4264, 4305, 4346,
4388, 4429, 4471, 4512, 4553, 4595, 4635, 4676, 4718, 4759,
4800, 4841, 4882, 4923, 4964, 5006, 5047, 5088, 5129, 5170,
5211, 5252, 5292, 5333, 5374, 5415, 5456, 5497, 5538, 5578,
5619, 5660, 5700, 5741, 5782, 5822, 5863, 5904, 5944, 5985,
6026, 6067, 6107, 6148, 6187, 6229, 6269, 6310, 6350, 6391,
6430, 6470, 6511, 6551, 6591, 6631, 6672, 6712, 6752, 6792,
6833, 6873, 6913, 6953, 6993, 7033, 7073, 7113, 7153, 7193,
7233, 7273, 7313, 7353, 7393, 7433, 7473, 7513, 7553, 7593,
7633, 7673, 7713, 7752, 7792, 7832, 7872, 7911, 7951, 7991,
8031, 8070, 8110, 8150, 8189, 8229, 8269, 8308, 8348, 8388,
8427, 8467, 8506, 8546, 8585, 8625, 8664, 8704, 8743, 8783,
8822, 8862, 8901, 8940, 8980, 9019, 9059, 9098, 9137, 9177,
9216, 9255, 9295, 9334, 9373, 9412, 9452, 9491, 9530, 9569,
9609, 9648, 9687, 9726, 9765, 9804, 9844, 9883, 9922, 9961,
10000,10039,10078,10117,10156,10195,10234,10273,10312,10351,
10390,10429,10468,10507,10546,10585,10624,10663,10702,10740,
10779,10818,10857,10896,10935,10973,11012,11051,11090,11128,
11167,11206,11245,11283,11322,11361,11399,11438,11477,11515,
11554,11593,11631,11670,11708,11747,11785,11824,11862,11901,
11940,11978,12016,12055,12093,12132,12170,12209,12247,12286,
12324,12362,12401,12439,12477,12517,12555,12593,12632,12670,
12708,12746,12785,12823,12861,12899,12938,12976,13014,13052,
13090,13128,13167,13205,13243,13281,13319,13357,13395,13433,
13471,13509,13547,13585,13623,13661,13699,13737,13775,13813,
13851,13889,13927,13965,14003,14039,14077,14115,14153,14191,
14229,14266,14304,14342,14380,14418,14456,14494,14532,14569,
14607,14645,14682,14720,14758,14795,14833,14871,14908,14946,
14983,15021,15058,15096,15134,15171,15209,15246,15284,15321,
15358,15395,15432,15471,15508,15546,15583,15621,15658,15696,
15733,15771,15808,15845,15883,15920,15956,15994,16031,16068,
16105,16143,16180,16217,16254,16291,16328,16366,16403,16440,
16477,16514,16551,16588,16625,16662,16700,16737,16774,16811,
16848,16885,16922,16959,16996,17033,17069,17106,17143,17180,
17217,17254,17291,17327,17364,17401,17439,17475,17512,17549,
17586,17623,17659,17696,17733,17770,17806,17843,17880,17916,
17953,17990,18026,18063,18099,18136,18173,18209,18246,18282,
18319,18355,18392,18428,18465,18501,18538,18574,18611,18647,
18684,18720,18756,18793,18829,18865,18902,18938,18974,19011,
19047,19083,19120,19156,19192,19228,19266,19302,19338,19374,
19410,19447,19483,19519,19555,19590,19626,19662,19698,19735,
19771,19807,19843,19879,19915,19951,19987,20023,20059,20095,
20131,20167,20203,20238,20274,20310,20346,20382,20418,20454,
20490,20525,20561,20597,20633,20670,20705,20741,20777,20813,
20848,20884,20920,20955,20991,21027,21062,21098,21134,21169,
21205,21240,21276,21312,21347,21383,21419,21455,21490,21526,
21561,21597,21632,21668,21703,21739,21773,21808,21844,21879,
21915,21950,21985,22021,22056,22091,22127,22162,22197,22232,
22268,22303,22338,22373,22409,22445,22480,22515,22550,22585,
22621,22656,22691,22726,22761,22796,22831,22866,22901,22936,
22972,23007,23042,23077,23112,23147,23181,23216,23251,23286,
23321,23356,23391,23426,23460,23495,23530,23565,23600,23635,
23670,23705,23740,23775,23809,23844,23879,23914,23948,23983,
24018,24052,24087,24122,24156,24191,24225,24260,24295,24329,
24364,24398,24433,24467,24502,24536,24571,24605,24640,24674,
24709,24743,24778,24812,24846,24881,24915,24950,24984,25018,
25053,25089,25121,25155,25190,25224,25259,25294,25328,25362,
25396,25430,25465,25499,25533,25567,25601,25635,25670,25704,
25738,25772,25806,25840,25874,25908,25942,25976,26010,26044,
26078,26112,26146,26180,26214,26248,26283,26317,26350,26384,
26418,26452,26486,26520,26554,26587,26621,26655,26689,26722,
26756,26790,26824,26857,26891,26925,26958,26992,27026,27059,
27093,27127,27160,27194,27227,27261,27295,27328,27362,27395,
27429,27462,27496,27529,27563,27596,27631,27664,27697,27731,
27764,27798,27831,27864,27898,27931,27964,27998,28031,28064,
28098,28131,28164,28197,28231,28264,28297,28330,28363,28397,
28430,28463,28496,28529,28562,28595,28630,28663,28696,28729,
28762,28795,28828,28861,28894,28927,28960,28993,29026,29059,
29092,29125,29158,29190,29223,29256,29290,29323,29356,29389,
29421,29454,29487,29520,29553,29585,29618,29651,29684,29716,
29749,29782,29814,29847,29880,29912,29945,29978,30010,30043,
30075,30108,30141,30173,30206,30238,30271,30303,30336,30368,
30401,30433,30466,30498,30530,30563,30595,30628,30660,30692,
30725,30757,30789,30822,30854,30886,30919,30951,30983,31015,
31048,31080,31112,31145,31178,31210,31243,31275,31307,31339,
31371,31404,31436,31468,31500,31532,31564,31596,31628,31660,
31692,31724,31756,31788,31820,31852,31885,31917,31949,31981,
32012,32044,32076,32108,32140,32172,32203,32234,32266,32298,
32330,32361,32393,32425,32457,32488,32521,32553,32585,32616,
32648,32679,32711,32743,32774,32806,32838,32869,32901,32932,
32964,32995,33027,33058,33090,33121,33153,33184,33216,33247,
33279,33310,33341,33373,33404,33436,33468,33499,33531,33562,
33593,33625,33656,33687,33718,33750,33781,33812,33843,33875,
33906,33937,33968,33999,34030,34062,34094,34125,34155,34187,
34218,34249,34280,34311,34342,34373,34404,34435,34466,34497,
34528,34559,34590,34621,34652,34683,34715,34746,34776,34807,
34838,34869,34900,34931,34961,34992,35023,35054,35085,35115,
35146,35177,35207,35238,35269,35299,35330,35361,35391,35422,
35453,35483,35514,35544,35575,35606,35637,35668,35698,35729,
35759,35790,35820,35851,35881,35912,35942,35972,36003,36033,
36064,36094,36124,36155,36185,36215,36246,36276,36306,36336,
36367,36397,36427,36457,36488,36518,36549,36579,36609,36640,
36670,36700,36730,36760,36790,36820,36850,36881,36911,36941,
36971,37001,37031,37061,37091,37121,37152,37182,37212,37241,
37271,37301,37331,37361,37391,37421,37451,37480,37510,37540,
37570,37600,37629,37659,37689,37719,37749,37779,37809,37839,
37868,37898,37928,37957,37987,38017,38046,38076,38105,38135,
38165,38194,38224,38253,38283,38312,38342,38371,38401,38430,
38460,38489,38518,38548,38577,38607,38637,38666,38696,38725,
38755,38784,38813,38842,38872,38901,38931,38961,38990,39019,
39048 // Pt100 resistance * 100 at 850C
} ;
const static uint16_t Pt100_table[1051] PROGMEM = {
1852, 1896, 1939, 1982, 2025, 2068, 2111, 2154, 2197, 2240,
2283, 2326, 2369, 2412, 2455, 2497, 2539, 2582, 2625, 2667,
2710, 2752, 2795, 2837, 2880, 2922, 2965, 3007, 3049, 3092,
3134, 3176, 3218, 3261, 3303, 3345, 3386, 3428, 3470, 3512,
3554, 3596, 3638, 3680, 3722, 3763, 3805, 3847, 3889, 3931,
3972, 4014, 4056, 4097, 4139, 4180, 4222, 4264, 4305, 4346,
4388, 4429, 4471, 4512, 4553, 4595, 4635, 4676, 4718, 4759,
4800, 4841, 4882, 4923, 4964, 5006, 5047, 5088, 5129, 5170,
5211, 5252, 5292, 5333, 5374, 5415, 5456, 5497, 5538, 5578,
5619, 5660, 5700, 5741, 5782, 5822, 5863, 5904, 5944, 5985,
6026, 6067, 6107, 6148, 6187, 6229, 6269, 6310, 6350, 6391,
6430, 6470, 6511, 6551, 6591, 6631, 6672, 6712, 6752, 6792,
6833, 6873, 6913, 6953, 6993, 7033, 7073, 7113, 7153, 7193,
7233, 7273, 7313, 7353, 7393, 7433, 7473, 7513, 7553, 7593,
7633, 7673, 7713, 7752, 7792, 7832, 7872, 7911, 7951, 7991,
8031, 8070, 8110, 8150, 8189, 8229, 8269, 8308, 8348, 8388,
8427, 8467, 8506, 8546, 8585, 8625, 8664, 8704, 8743, 8783,
8822, 8862, 8901, 8940, 8980, 9019, 9059, 9098, 9137, 9177,
9216, 9255, 9295, 9334, 9373, 9412, 9452, 9491, 9530, 9569,
9609, 9648, 9687, 9726, 9765, 9804, 9844, 9883, 9922, 9961,
10000, 10039, 10078, 10117, 10156, 10195, 10234, 10273, 10312, 10351,
10390, 10429, 10468, 10507, 10546, 10585, 10624, 10663, 10702, 10740,
10779, 10818, 10857, 10896, 10935, 10973, 11012, 11051, 11090, 11128,
11167, 11206, 11245, 11283, 11322, 11361, 11399, 11438, 11477, 11515,
11554, 11593, 11631, 11670, 11708, 11747, 11785, 11824, 11862, 11901,
11940, 11978, 12016, 12055, 12093, 12132, 12170, 12209, 12247, 12286,
12324, 12362, 12401, 12439, 12477, 12517, 12555, 12593, 12632, 12670,
12708, 12746, 12785, 12823, 12861, 12899, 12938, 12976, 13014, 13052,
13090, 13128, 13167, 13205, 13243, 13281, 13319, 13357, 13395, 13433,
13471, 13509, 13547, 13585, 13623, 13661, 13699, 13737, 13775, 13813,
13851, 13889, 13927, 13965, 14003, 14039, 14077, 14115, 14153, 14191,
14229, 14266, 14304, 14342, 14380, 14418, 14456, 14494, 14532, 14569,
14607, 14645, 14682, 14720, 14758, 14795, 14833, 14871, 14908, 14946,
14983, 15021, 15058, 15096, 15134, 15171, 15209, 15246, 15284, 15321,
15358, 15395, 15432, 15471, 15508, 15546, 15583, 15621, 15658, 15696,
15733, 15771, 15808, 15845, 15883, 15920, 15956, 15994, 16031, 16068,
16105, 16143, 16180, 16217, 16254, 16291, 16328, 16366, 16403, 16440,
16477, 16514, 16551, 16588, 16625, 16662, 16700, 16737, 16774, 16811,
16848, 16885, 16922, 16959, 16996, 17033, 17069, 17106, 17143, 17180,
17217, 17254, 17291, 17327, 17364, 17401, 17439, 17475, 17512, 17549,
17586, 17623, 17659, 17696, 17733, 17770, 17806, 17843, 17880, 17916,
17953, 17990, 18026, 18063, 18099, 18136, 18173, 18209, 18246, 18282,
18319, 18355, 18392, 18428, 18465, 18501, 18538, 18574, 18611, 18647,
18684, 18720, 18756, 18793, 18829, 18865, 18902, 18938, 18974, 19011,
19047, 19083, 19120, 19156, 19192, 19228, 19266, 19302, 19338, 19374,
19410, 19447, 19483, 19519, 19555, 19590, 19626, 19662, 19698, 19735,
19771, 19807, 19843, 19879, 19915, 19951, 19987, 20023, 20059, 20095,
20131, 20167, 20203, 20238, 20274, 20310, 20346, 20382, 20418, 20454,
20490, 20525, 20561, 20597, 20633, 20670, 20705, 20741, 20777, 20813,
20848, 20884, 20920, 20955, 20991, 21027, 21062, 21098, 21134, 21169,
21205, 21240, 21276, 21312, 21347, 21383, 21419, 21455, 21490, 21526,
21561, 21597, 21632, 21668, 21703, 21739, 21773, 21808, 21844, 21879,
21915, 21950, 21985, 22021, 22056, 22091, 22127, 22162, 22197, 22232,
22268, 22303, 22338, 22373, 22409, 22445, 22480, 22515, 22550, 22585,
22621, 22656, 22691, 22726, 22761, 22796, 22831, 22866, 22901, 22936,
22972, 23007, 23042, 23077, 23112, 23147, 23181, 23216, 23251, 23286,
23321, 23356, 23391, 23426, 23460, 23495, 23530, 23565, 23600, 23635,
23670, 23705, 23740, 23775, 23809, 23844, 23879, 23914, 23948, 23983,
24018, 24052, 24087, 24122, 24156, 24191, 24225, 24260, 24295, 24329,
24364, 24398, 24433, 24467, 24502, 24536, 24571, 24605, 24640, 24674,
24709, 24743, 24778, 24812, 24846, 24881, 24915, 24950, 24984, 25018,
25053, 25089, 25121, 25155, 25190, 25224, 25259, 25294, 25328, 25362,
25396, 25430, 25465, 25499, 25533, 25567, 25601, 25635, 25670, 25704,
25738, 25772, 25806, 25840, 25874, 25908, 25942, 25976, 26010, 26044,
26078, 26112, 26146, 26180, 26214, 26248, 26283, 26317, 26350, 26384,
26418, 26452, 26486, 26520, 26554, 26587, 26621, 26655, 26689, 26722,
26756, 26790, 26824, 26857, 26891, 26925, 26958, 26992, 27026, 27059,
27093, 27127, 27160, 27194, 27227, 27261, 27295, 27328, 27362, 27395,
27429, 27462, 27496, 27529, 27563, 27596, 27631, 27664, 27697, 27731,
27764, 27798, 27831, 27864, 27898, 27931, 27964, 27998, 28031, 28064,
28098, 28131, 28164, 28197, 28231, 28264, 28297, 28330, 28363, 28397,
28430, 28463, 28496, 28529, 28562, 28595, 28630, 28663, 28696, 28729,
28762, 28795, 28828, 28861, 28894, 28927, 28960, 28993, 29026, 29059,
29092, 29125, 29158, 29190, 29223, 29256, 29290, 29323, 29356, 29389,
29421, 29454, 29487, 29520, 29553, 29585, 29618, 29651, 29684, 29716,
29749, 29782, 29814, 29847, 29880, 29912, 29945, 29978, 30010, 30043,
30075, 30108, 30141, 30173, 30206, 30238, 30271, 30303, 30336, 30368,
30401, 30433, 30466, 30498, 30530, 30563, 30595, 30628, 30660, 30692,
30725, 30757, 30789, 30822, 30854, 30886, 30919, 30951, 30983, 31015,
31048, 31080, 31112, 31145, 31178, 31210, 31243, 31275, 31307, 31339,
31371, 31404, 31436, 31468, 31500, 31532, 31564, 31596, 31628, 31660,
31692, 31724, 31756, 31788, 31820, 31852, 31885, 31917, 31949, 31981,
32012, 32044, 32076, 32108, 32140, 32172, 32203, 32234, 32266, 32298,
32330, 32361, 32393, 32425, 32457, 32488, 32521, 32553, 32585, 32616,
32648, 32679, 32711, 32743, 32774, 32806, 32838, 32869, 32901, 32932,
32964, 32995, 33027, 33058, 33090, 33121, 33153, 33184, 33216, 33247,
33279, 33310, 33341, 33373, 33404, 33436, 33468, 33499, 33531, 33562,
33593, 33625, 33656, 33687, 33718, 33750, 33781, 33812, 33843, 33875,
33906, 33937, 33968, 33999, 34030, 34062, 34094, 34125, 34155, 34187,
34218, 34249, 34280, 34311, 34342, 34373, 34404, 34435, 34466, 34497,
34528, 34559, 34590, 34621, 34652, 34683, 34715, 34746, 34776, 34807,
34838, 34869, 34900, 34931, 34961, 34992, 35023, 35054, 35085, 35115,
35146, 35177, 35207, 35238, 35269, 35299, 35330, 35361, 35391, 35422,
35453, 35483, 35514, 35544, 35575, 35606, 35637, 35668, 35698, 35729,
35759, 35790, 35820, 35851, 35881, 35912, 35942, 35972, 36003, 36033,
36064, 36094, 36124, 36155, 36185, 36215, 36246, 36276, 36306, 36336,
36367, 36397, 36427, 36457, 36488, 36518, 36549, 36579, 36609, 36640,
36670, 36700, 36730, 36760, 36790, 36820, 36850, 36881, 36911, 36941,
36971, 37001, 37031, 37061, 37091, 37121, 37152, 37182, 37212, 37241,
37271, 37301, 37331, 37361, 37391, 37421, 37451, 37480, 37510, 37540,
37570, 37600, 37629, 37659, 37689, 37719, 37749, 37779, 37809, 37839,
37868, 37898, 37928, 37957, 37987, 38017, 38046, 38076, 38105, 38135,
38165, 38194, 38224, 38253, 38283, 38312, 38342, 38371, 38401, 38430,
38460, 38489, 38518, 38548, 38577, 38607, 38637, 38666, 38696, 38725,
38755, 38784, 38813, 38842, 38872, 38901, 38931, 38961, 38990, 39019,
39048 // Pt100 resistance * 100 at 850C
} ;

const int PT100_TABLE_MAXIDX = ((sizeof(Pt100_table) / sizeof(uint16_t)) - 1) ;

class pt100rtd
{
private:
private:
int search_pt100_list(uint16_t key) ;
float ohmsX100_to_celsius(uint16_t ohmsX100) ;

public:
public:
pt100rtd() ;

float celsius (uint16_t ohmsX100) ;
float celsius(uint16_t ohmsX100) ;
float celsius(float Rrtd) ;

float celsius_to_Pt100ohms (float celsius) ;
Expand All @@ -187,4 +187,3 @@ class pt100rtd
} ;

#endif // PT100RTD_H