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93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
/*
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* ThermoModel.cpp
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*
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* Created on: 1 May 2021
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* Author: Ralim
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*/
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#include "TipThermoModel.h"
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#include "Utils.h"
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#include "configuration.h"
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#ifdef TEMP_uV_LOOKUP_PT1000
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// Use https://br.flukecal.com/pt100-table-generator to make table for resistance to temp
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const int32_t ohmsToDegC[] = {
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//
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// Resistance (ohms x10) Temperature (Celsius)
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10000, 0, //
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10390, 10, //
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10779, 20, //
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11167, 30, //
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11554, 40, //
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11940, 50, //
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12324, 60, //
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12708, 70, //
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13090, 80, //
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13471, 90, //
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13851, 100, //
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14229, 110, //
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14607, 120, //
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14983, 130, //
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15358, 140, //
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15733, 150, //
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16105, 160, //
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16477, 170, //
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16848, 180, //
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17217, 190, //
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17586, 200, //
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17953, 210, //
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18319, 220, //
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18684, 230, //
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19047, 240, //
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19410, 250, //
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19771, 260, //
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20131, 270, //
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20490, 280, //
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20848, 290, //
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21205, 300, //
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21561, 310, //
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21915, 320, //
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22268, 330, //
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22621, 340, //
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22972, 350, //
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23321, 360, //
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23670, 370, //
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24018, 380, //
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24364, 390, //
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24709, 400, //
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25053, 410, //
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25396, 420, //
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25738, 430, //
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26078, 440, //
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26418, 450, //
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26756, 460, //
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27093, 470, //
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27429, 480, //
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27764, 490, //
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28098, 500, //
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};
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TemperatureType_t TipThermoModel::convertuVToDegC(uint32_t tipuVDelta) {
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// 3.3V -> 1K ->(ADC) <- PT1000 <- GND
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// PT100 = (adc*r1)/(3.3V-adc)
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uint32_t reading_mv = tipuVDelta / 1000;
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uint32_t resistance_x10 = (reading_mv * 10000) / (3300 - reading_mv);
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return Utils::InterpolateLookupTable(ohmsToDegC, sizeof(ohmsToDegC) / (2 * sizeof(int32_t)), resistance_x10);
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}
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#endif // TEMP_uV_LOOKUP_PT1000
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#ifdef TEMP_uV_LOOKUP_S60
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TemperatureType_t TipThermoModel::convertuVToDegC(uint32_t tipuVDelta) { return (tipuVDelta * 50) / 485; }
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#endif // TEMP_uV_LOOKUP_S60
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#ifdef TEMP_uV_LOOKUP_S99
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// 42.85 uV / K -> 1/42.85 K/uV = 20/857
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// TemperatureType_t TipThermoModel::convertuVToDegC(uint32_t tipuVDelta) { return (tipuVDelta * 20) / 857; }
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// Measurement is probably with heating element in series, thats why the reading differs from the approx 42.85 uV/K
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TemperatureType_t TipThermoModel::convertuVToDegC(uint32_t tipuVDelta) { return (tipuVDelta * 1) / 30; }
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#endif // TEMP_uV_LOOKUP_S99
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