Use make to build the program.
Simply execute thermistor-calculator -h to display program full help.
Here is what the help looks like :
ar@ar-i7:~/Documents/Thermistor_Calculator$ ./thermistor-calculator -h
+-------------------------------------------------+
| Thermistor calculator (C) 2018 Adrien RICCIARDI |
+-------------------------------------------------+
Compute the ADC lookup table (containing Celsius temperatures) corresponding to a specific thermistor voltage, taking into account the voltage divider the thermistor is connected to.
For now, only Negative Temperature Coefficient thermistors are supported.
Here are the two voltage divider circuits that are supported by the program :
Circuit variant 1 Circuit variant 2
----------------- -----------------
Vcc Vcc
| |
+-+ +-+
| | Resistor | | NTC
+-+ +-+
| |
|--- Vout |--- Vout
| |
+-+ +-+
| | NTC | | Resistor
+-+ +-+
| |
GND GND
Usage : ./thermistor-calculator [-c circuit] [-B beta] [-R R25] [-r resistor] [-v Vcc] [-a resolution] [-h]
-c : circuit variant, it can be 1 or 2 (see above for circuit variants description). Default value is 1.
-B : thermistor Beta coefficient (kelvin), this is the B25/100 value of the datasheet. Default value is 4300.
-R : thermistor resistance at 25 Celsius degrees (ohm), floating numbers are allowed. Default value is 10000.
-r : voltage divider bridge other resistance value (ohm), floating numbers are allowed. Default value is 10000.
-v : Vcc voltage (volt), floating numbers are allowed. Default value is 3.3.
-a : ADC resolution (or how many values you want in the lookup table). Default value is 256.
-h : display this help.
This is the program output for the following circuit characteristics :
- Circuit variant : 2
- Thermistor beta : 3988
- Thermistor resistance at 25 Celsius degrees : 10K
- Voltage divider other resistance : 10K
- Vcc : 3.3V
- ADC resolution : 8 bits
ar@ar-i7:~/Documents/Thermistor_Calculator$ ./thermistor-calculator -c 2 -B 3988 -R 10000 -r 10000 -v 3.3 -a 256
+-------------------------------------------------+
| Thermistor calculator (C) 2018 Adrien RICCIARDI |
+-------------------------------------------------+
ADC value Thermistor voltage (V) Thermistor resistance (ohm) Thermistor temperature (Celsius)
0 0.000000 inf -273.150000
1 0.012941 2540000.000000 -62.291438
2 0.025882 1265000.000000 -54.222305
3 0.038824 840000.000000 -49.188530
4 0.051765 627500.000000 -45.459139
5 0.064706 500000.000000 -42.467632
6 0.077647 415000.000000 -39.954231
7 0.090588 354285.714286 -37.777228
8 0.103529 308750.000000 -35.850469
9 0.116471 273333.333333 -34.117511
10 0.129412 245000.000000 -32.539288
11 0.142353 221818.181818 -31.087597
12 0.155294 202500.000000 -29.741386
13 0.168235 186153.846154 -28.484510
14 0.181176 172142.857143 -27.304304
15 0.194118 160000.000000 -26.190645
16 0.207059 149375.000000 -25.135305
17 0.220000 140000.000000 -24.131507
18 0.232941 131666.666667 -23.173599
19 0.245882 124210.526316 -22.256812
20 0.258824 117500.000000 -21.377090
21 0.271765 111428.571429 -20.530949
22 0.284706 105909.090909 -19.715375
23 0.297647 100869.565217 -18.927741
24 0.310588 96250.000000 -18.165746
25 0.323529 92000.000000 -17.427357
26 0.336471 88076.923077 -16.710775
27 0.349412 84444.444444 -16.014395
28 0.362353 81071.428571 -15.336783
29 0.375294 77931.034483 -14.676648
30 0.388235 75000.000000 -14.032827
31 0.401176 72258.064516 -13.404266
32 0.414118 69687.500000 -12.790006
33 0.427059 67272.727273 -12.189177
34 0.440000 65000.000000 -11.600980
35 0.452941 62857.142857 -11.024683
36 0.465882 60833.333333 -10.459616
37 0.478824 58918.918919 -9.905159
38 0.491765 57105.263158 -9.360739
39 0.504706 55384.615385 -8.825829
40 0.517647 53750.000000 -8.299936
41 0.530588 52195.121951 -7.782604
42 0.543529 50714.285714 -7.273409
43 0.556471 49302.325581 -6.771953
44 0.569412 47954.545455 -6.277867
45 0.582353 46666.666667 -5.790802
46 0.595294 45434.782609 -5.310434
47 0.608235 44255.319149 -4.836457
48 0.621176 43125.000000 -4.368584
49 0.634118 42040.816327 -3.906543
50 0.647059 41000.000000 -3.450080
51 0.660000 40000.000000 -2.998952
52 0.672941 39038.461538 -2.552932
53 0.685882 38113.207547 -2.111804
54 0.698824 37222.222222 -1.675362
55 0.711765 36363.636364 -1.243413
56 0.724706 35535.714286 -0.815771
57 0.737647 34736.842105 -0.392260
58 0.750588 33965.517241 0.027287
59 0.763529 33220.338983 0.443029
60 0.776471 32500.000000 0.855120
61 0.789412 31803.278689 1.263705
62 0.802353 31129.032258 1.668923
63 0.815294 30476.190476 2.070908
64 0.828235 29843.750000 2.469787
65 0.841176 29230.769231 2.865683
66 0.854118 28636.363636 3.258714
67 0.867059 28059.701493 3.648993
68 0.880000 27500.000000 4.036628
69 0.892941 26956.521739 4.421724
70 0.905882 26428.571429 4.804382
71 0.918824 25915.492958 5.184699
72 0.931765 25416.666667 5.562769
73 0.944706 24931.506849 5.938683
74 0.957647 24459.459459 6.312528
75 0.970588 24000.000000 6.684390
76 0.983529 23552.631579 7.054349
77 0.996471 23116.883117 7.422487
78 1.009412 22692.307692 7.788879
79 1.022353 22278.481013 8.153602
80 1.035294 21875.000000 8.516726
81 1.048235 21481.481481 8.878325
82 1.061176 21097.560976 9.238465
83 1.074118 20722.891566 9.597214
84 1.087059 20357.142857 9.954638
85 1.100000 20000.000000 10.310800
86 1.112941 19651.162791 10.665763
87 1.125882 19310.344828 11.019586
88 1.138824 18977.272727 11.372330
89 1.151765 18651.685393 11.724053
90 1.164706 18333.333333 12.074811
91 1.177647 18021.978022 12.424660
92 1.190588 17717.391304 12.773655
93 1.203529 17419.354839 13.121850
94 1.216471 17127.659574 13.469296
95 1.229412 16842.105263 13.816047
96 1.242353 16562.500000 14.162152
97 1.255294 16288.659794 14.507663
98 1.268235 16020.408163 14.852628
99 1.281176 15757.575758 15.197096
100 1.294118 15500.000000 15.541116
101 1.307059 15247.524752 15.884735
102 1.320000 15000.000000 16.227999
103 1.332941 14757.281553 16.570956
104 1.345882 14519.230769 16.913651
105 1.358824 14285.714286 17.256130
106 1.371765 14056.603774 17.598438
107 1.384706 13831.775701 17.940620
108 1.397647 13611.111111 18.282721
109 1.410588 13394.495413 18.624784
110 1.423529 13181.818182 18.966853
111 1.436471 12972.972973 19.308974
112 1.449412 12767.857143 19.651188
113 1.462353 12566.371681 19.993541
114 1.475294 12368.421053 20.336074
115 1.488235 12173.913043 20.678832
116 1.501176 11982.758621 21.021858
117 1.514118 11794.871795 21.365195
118 1.527059 11610.169492 21.708886
119 1.540000 11428.571429 22.052975
120 1.552941 11250.000000 22.397506
121 1.565882 11074.380165 22.742522
122 1.578824 10901.639344 23.088067
123 1.591765 10731.707317 23.434185
124 1.604706 10564.516129 23.780920
125 1.617647 10400.000000 24.128317
126 1.630588 10238.095238 24.476421
127 1.643529 10078.740157 24.825276
128 1.656471 9921.875000 25.174929
129 1.669412 9767.441860 25.525424
130 1.682353 9615.384615 25.876810
131 1.695294 9465.648855 26.229131
132 1.708235 9318.181818 26.582436
133 1.721176 9172.932331 26.936773
134 1.734118 9029.850746 27.292189
135 1.747059 8888.888889 27.648734
136 1.760000 8750.000000 28.006459
137 1.772941 8613.138686 28.365412
138 1.785882 8478.260870 28.725646
139 1.798824 8345.323741 29.087212
140 1.811765 8214.285714 29.450163
141 1.824706 8085.106383 29.814553
142 1.837647 7957.746479 30.180437
143 1.850588 7832.167832 30.547869
144 1.863529 7708.333333 30.916908
145 1.876471 7586.206897 31.287610
146 1.889412 7465.753425 31.660034
147 1.902353 7346.938776 32.034240
148 1.915294 7229.729730 32.410291
149 1.928235 7114.093960 32.788248
150 1.941176 7000.000000 33.168175
151 1.954118 6887.417219 33.550138
152 1.967059 6776.315789 33.934204
153 1.980000 6666.666667 34.320442
154 1.992941 6558.441558 34.708922
155 2.005882 6451.612903 35.099716
156 2.018824 6346.153846 35.492898
157 2.031765 6242.038217 35.888543
158 2.044706 6139.240506 36.286730
159 2.057647 6037.735849 36.687539
160 2.070588 5937.500000 37.091052
161 2.083529 5838.509317 37.497353
162 2.096471 5740.740741 37.906530
163 2.109412 5644.171779 38.318672
164 2.122353 5548.780488 38.733871
165 2.135294 5454.545455 39.152223
166 2.148235 5361.445783 39.573826
167 2.161176 5269.461078 39.998781
168 2.174118 5178.571429 40.427192
169 2.187059 5088.757396 40.859168
170 2.200000 5000.000000 41.294820
171 2.212941 4912.280702 41.734264
172 2.225882 4825.581395 42.177618
173 2.238824 4739.884393 42.625008
174 2.251765 4655.172414 43.076560
175 2.264706 4571.428571 43.532408
176 2.277647 4488.636364 43.992690
177 2.290588 4406.779661 44.457548
178 2.303529 4325.842697 44.927132
179 2.316471 4245.810056 45.401595
180 2.329412 4166.666667 45.881098
181 2.342353 4088.397790 46.365808
182 2.355294 4010.989011 46.855898
183 2.368235 3934.426230 47.351551
184 2.381176 3858.695652 47.852955
185 2.394118 3783.783784 48.360306
186 2.407059 3709.677419 48.873812
187 2.420000 3636.363636 49.393685
188 2.432941 3563.829787 49.920153
189 2.445882 3492.063492 50.453449
190 2.458824 3421.052632 50.993820
191 2.471765 3350.785340 51.541524
192 2.484706 3281.250000 52.096831
193 2.497647 3212.435233 52.660026
194 2.510588 3144.329897 53.231408
195 2.523529 3076.923077 53.811290
196 2.536471 3010.204082 54.400003
197 2.549412 2944.162437 54.997894
198 2.562353 2878.787879 55.605331
199 2.575294 2814.070352 56.222701
200 2.588235 2750.000000 56.850413
201 2.601176 2686.567164 57.488900
202 2.614118 2623.762376 58.138621
203 2.627059 2561.576355 58.800062
204 2.640000 2500.000000 59.473737
205 2.652941 2439.024390 60.160194
206 2.665882 2378.640777 60.860017
207 2.678824 2318.840580 61.573826
208 2.691765 2259.615385 62.302283
209 2.704706 2200.956938 63.046095
210 2.717647 2142.857143 63.806019
211 2.730588 2085.308057 64.582864
212 2.743529 2028.301887 65.377501
213 2.756471 1971.830986 66.190864
214 2.769412 1915.887850 67.023958
215 2.782353 1860.465116 67.877868
216 2.795294 1805.555556 68.753767
217 2.808235 1751.152074 69.652925
218 2.821176 1697.247706 70.576717
219 2.834118 1643.835616 71.526642
220 2.847059 1590.909091 72.504331
221 2.860000 1538.461538 73.511568
222 2.872941 1486.486486 74.550304
223 2.885882 1434.977578 75.622685
224 2.898824 1383.928571 76.731074
225 2.911765 1333.333333 77.878079
226 2.924706 1283.185841 79.066595
227 2.937647 1233.480176 80.299840
228 2.950588 1184.210526 81.581406
229 2.963529 1135.371179 82.915322
230 2.976471 1086.956522 84.306122
231 2.989412 1038.961039 85.758935
232 3.002353 991.379310 87.279589
233 3.015294 944.206009 88.874746
234 3.028235 897.435897 90.552065
235 3.041176 851.063830 92.320404
236 3.054118 805.084746 94.190087
237 3.067059 759.493671 96.173236
238 3.080000 714.285714 98.284206
239 3.092941 669.456067 100.540162
240 3.105882 625.000000 102.961849
241 3.118824 580.912863 105.574642
242 3.131765 537.190083 108.410006
243 3.144706 493.827160 111.507574
244 3.157647 450.819672 114.918184
245 3.170588 408.163265 118.708446
246 3.183529 365.853659 122.967863
247 3.196471 323.886640 127.820423
248 3.209412 282.258065 133.444459
249 3.222353 240.963855 140.108934
250 3.235294 200.000000 148.245455
251 3.248235 159.362550 158.607848
252 3.261176 119.047619 172.685625
253 3.274118 79.051383 194.071000
254 3.287059 39.370079 235.621896
255 3.300000 0.000000 -273.150000
ADC lookup table :
-273, -62, -54, -49, -45, -42, -40, -38, -36, -34, -33, -31, -30, -28, -27, -26,
-25, -24, -23, -22, -21, -21, -20, -19, -18, -17, -17, -16, -15, -15, -14, -13,
-13, -12, -12, -11, -10, -10, -9, -9, -8, -8, -7, -7, -6, -6, -5, -5,
-4, -4, -3, -3, -3, -2, -2, -1, -1, 0, 0, 0, 1, 1, 2, 2,
2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8,
9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14,
14, 15, 15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19,
20, 20, 20, 21, 21, 21, 22, 22, 22, 23, 23, 23, 24, 24, 24, 25,
25, 26, 26, 26, 27, 27, 27, 28, 28, 28, 29, 29, 29, 30, 30, 31,
31, 31, 32, 32, 32, 33, 33, 34, 34, 34, 35, 35, 35, 36, 36, 37,
37, 37, 38, 38, 39, 39, 40, 40, 40, 41, 41, 42, 42, 43, 43, 44,
44, 44, 45, 45, 46, 46, 47, 47, 48, 48, 49, 49, 50, 50, 51, 52,
52, 53, 53, 54, 54, 55, 56, 56, 57, 57, 58, 59, 59, 60, 61, 62,
62, 63, 64, 65, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76,
77, 78, 79, 80, 82, 83, 84, 86, 87, 89, 91, 92, 94, 96, 98, 101,
103, 106, 108, 112, 115, 119, 123, 128, 133, 140, 148, 159, 173, 194, 236, -273,