calibrate ec
This commit is contained in:
parent
8cf4395827
commit
a0f4c25a53
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@ -29,7 +29,7 @@ uint16_t ec_calib_array_pos=0;
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uint16_t ec_array[EC_ARRAY_SIZE];
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uint16_t ec_array_pos=EC_ARRAY_SIZE;
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unsigned long last_measurement_ec=0;
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#define EC_MEASUREMENT_INTERVAL 60000 //complete filtered measurement every x ms
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#define EC_MEASUREMENT_INTERVAL 30000 //complete filtered measurement every x ms
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//One filtered measurement takes EC_READ_INTERVAL*EC_ARRAY_SIZE*4
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#define EC_READ_INTERVAL 10 //interval of reading adc value inside a measurement. one reading takes about 9-10ms
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@ -57,10 +57,11 @@ float ec_reference_adc=6016.88; //adc reference value for the calibration resist
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//x^0*p[0] + ... + x^n*p[n]
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//float ec_calibration_polynom[]={691.5992624638029,-1.4015367296761692,0.0008513503472324141,-2.2140576823179093e-07,2.8962580780180067e-11,-1.8577565383307114e-15,4.7162479484903865e-20};
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//float ec_calibration_polynom[]={1033.928052655456,-3.8909104921922895,0.005627541436014758,-4.103988840997024e-06,1.7231981870816133e-09,-4.433707707721975e-13,7.203892111369395e-17,-7.406549810844244e-21,4.667420606439905e-25,-1.6439457516812463e-29,2.477292190335455e-34};
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float ec_calibration_polynom[]={212.6826331524675,-0.6043878865263305,0.000571551634082491,-1.827897106718841e-07,2.682337041246909e-11,-1.8368511021965982e-15,4.8269168538877025e-20};
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//float ec_calibration_polynom[]={1033.928052655456,-3.8909104921922895,0.005627541436014758,-4.103988840997024e-06,1.7231981870816133e-09,-4.433707707721975e-13,7.203892111369395e-17,-7.406549810844244e-21,4.667420606439905e-25,-1.6439457516812463e-29,2.477292190335455e-34}; //20220505
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float ec_calibration_polynom[]={-323.68589929771457,0.5836096440900665,-0.000279737392438965,5.98673062873e-08,-5.4460235093798435e-12,1.8535134644431135e-16}; //20230509
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//float ec_calibration_polynom[]={212.6826331524675,-0.6043878865263305,0.000571551634082491,-1.827897106718841e-07,2.682337041246909e-11,-1.8368511021965982e-15,4.8269168538877025e-20}; //20230509 manuell
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float ec_calibration_linearize_below_adc=6500; //use linear approximation below this adc value. 0=disable
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float ec_calibration_linear_lowADC=750; //x0
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float ec_calibration_linear_lowADC=746; //x0
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float ec_calibration_linear_lowEC=0; //y0
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bool ec_measurementReady();
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@ -0,0 +1,32 @@
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time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted
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101268,21.37,6017.88,8057.05,8055.72
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131325,21.44,6017.71,8031.89,8030.79
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161382,21.49,6017.91,8021.16,8019.78
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191439,21.54,6017.82,8007.08,8005.83
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221496,21.59,6017.95,7988.33,7986.92
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251553,21.63,6018.17,7974.48,7972.76
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281610,21.69,6018.26,7966.37,7964.54
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311667,21.75,6018.71,7956.08,7953.66
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341724,21.80,6018.76,7946.59,7944.11
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371781,21.84,6018.63,7940.63,7938.31
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401838,21.88,6018.53,7938.66,7936.48
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431895,21.94,6018.41,7951.11,7949.08
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461952,22.00,6018.60,7933.68,7931.41
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492009,22.01,6018.60,7924.54,7922.27
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522066,22.06,6018.66,7916.94,7914.60
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552123,22.12,6018.75,7911.43,7908.97
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582180,22.15,6018.97,7906.98,7904.23
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612237,22.19,6019.16,7904.89,7901.90
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642294,22.25,6018.83,7899.79,7897.24
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672351,22.27,6018.82,7898.05,7895.50
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702408,22.31,6018.77,7896.98,7894.51
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732465,22.37,6018.59,7890.25,7888.01
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762522,22.38,6018.69,7884.41,7882.04
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792579,22.44,6018.36,7880.67,7878.73
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822636,22.45,6018.04,7875.55,7874.03
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852693,22.50,6018.09,7872.04,7870.46
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882750,22.55,6018.07,7868.66,7867.10
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912807,22.56,6018.48,7865.01,7862.92
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942864,22.62,6018.35,7862.13,7860.21
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972921,22.63,6018.74,7857.67,7855.24
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1002978,22.69,6018.77,7858.07,7855.60
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@ -0,0 +1,49 @@
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ecMeasured,time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted
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0,488810,25,6018.5,749.49,749.29
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0,500924,25,6018.5,749.85,749.65
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0,512968,25,6018.5,750.33,750.13
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470,607166,25,6018.38,6631.48,6629.84
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475,618283,25,6018.38,6632.4,6630.75
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480,630263,25,6018.38,6657.02,6655.37
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960,728530,25,6018.48,9028.83,9026.44
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965,739728,25,6018.48,9038.25,9035.85
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970,751586,25,6018.48,9085.94,9083.53
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1290,845876,25,6018.53,9975.25,9972.51
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1300,857889,25,6018.53,9956.18,9953.44
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1310,869129,25,6018.53,10024.26,10021.51
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3070,979125,25,6019,12369.85,12365.49
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3070,991238,25,6019,12391.81,12387.44
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3070,1003282,25,6019,12429.84,12425.47
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3620,1065510,25,6018.74,12577.39,12573.5
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3620,1079543,25,6018.86,12796.35,12792.14
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3620,1091656,25,6018.86,12823.02,12818.81
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30,1184837,25,6019.05,928.33,928
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30,1196950,25,6019.05,928.99,928.66
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30,1208340,25,6019.05,923.8,923.46
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380,1309239,25,6019.18,5713.99,5711.81
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380,1321252,25,6019.18,5718.64,5716.45
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380,1333296,25,6019.18,5738.1,5735.91
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710,1405519,25,6018.48,7862.59,7860.49
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710,1417563,25,6018.48,7861.14,7859.04
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710,1429607,25,6018.48,7859.18,7857.09
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1460,1488823,25,6018.43,10252.78,10250.14
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1460,1500836,25,6018.43,10266.79,10264.14
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1460,1511972,25,6018.43,10278.46,10275.82
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1960,1579122,25,6019.31,11072.54,11068.06
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1960,1596158,25,6019.48,11143.74,11138.92
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1960,1608171,25,6019.48,11162.37,11157.55
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2510,1661293,25,6019.38,11800.73,11795.82
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2510,1673306,25,6019.38,11757.97,11753.08
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2510,1684573,25,6019.38,11810.64,11805.73
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2840,1734501,25,6019.07,12125.58,12121.17
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2840,1746521,25,6019.07,12137.02,12132.61
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2840,1758704,25,6019.07,12165.2,12160.77
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3550,1821882,25,6018.94,12486.45,12482.18
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3550,1834006,25,6018.94,12587.85,12583.54
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3550,1845173,25,6018.94,12597,12592.7
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4220,1916439,25,6018.58,12688.82,12685.24
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4220,1928281,25,6018.58,12911.29,12907.65
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4220,1940325,25,6018.58,12946.13,12942.48
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5320,2164675,25,6018.38,13294.82,13291.5
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5320,2175910,25,6018.38,13343.59,13340.26
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5320,2187810,25,6018.38,13220.96,13217.66
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Binary file not shown.
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@ -0,0 +1,36 @@
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ecMeasured,time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted
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0,975348,24.75,6018.3,746.44,746.26
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0,986521,24.76,6018.3,746.37,746.19
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30,1058510,24.92,6018.8,883.8,883.52
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50,1093614,24.97,6018.78,1363.18,1362.75
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70,1125783,25.02,6018.88,1707.09,1706.52
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90,1167844,25.09,6018.88,2146.24,2145.53
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110,1211926,25.14,6018.93,2568.53,2567.65
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150,1258010,25.19,6018.48,3231.4,3230.54
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200,1307192,25.25,6018.39,3838.19,3837.22
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310,1349294,25.31,6018.68,4956.19,4954.71
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440,1398370,25.37,6018.42,6031.16,6029.62
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440,1410383,25.37,6018.42,6037.3,6035.75
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440,1453556,25.4,6018.02,6045.55,6044.4
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440,1477695,25.44,6018.08,6048.88,6047.68
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440,1519863,25.46,6017.67,6053.23,6052.44
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510,1576045,25.5,6018.12,6531.07,6529.73
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690,1669283,25.56,6018.22,7520.7,7519.03
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810,1706446,25.57,6018.15,8065.97,8064.27
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970,1750616,25.62,6018.21,8635.71,8633.8
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1180,1791783,25.62,6018.56,9272.33,9269.74
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1320,1899035,25.69,6018.59,9622.38,9619.66
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1470,1948148,25.69,6018.4,9947.52,9945.01
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1730,2020229,25.69,6018.11,10444.77,10442.64
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1910,2055333,25.69,6018.3,10763.83,10761.28
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2090,2163536,25.75,6018.43,10937.14,10934.32
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2320,2207599,25.75,6018.02,11288.6,11286.47
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2560,2290827,25.75,6018.48,11569.56,11566.47
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2900,2332985,25.75,6018.8,11867.85,11864.05
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3250,2422120,25.75,6017.84,12148.5,12146.55
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3900,2478252,25.75,6018.16,12552.99,12550.31
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4500,2535336,25.73,6018.65,12893.54,12889.75
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5240,2579418,25.69,6018.27,13288.07,13284.99
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5940,2612489,25.69,6018.07,13470.15,13467.48
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6020,2652655,25.69,6018.21,13508.16,13505.17
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7230,2744804,25.67,6018.02,13771.93,13769.33
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@ -0,0 +1,75 @@
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EC Peaktech neu kalibriert
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Lösung laut https://www.researchgate.net/profile/Sameer-Sayyad-2/post/How-is-it-possible-to-convert-conductivity-of-NaCl-solution-in-uS-to-its-salinity-NaCl-concentration-in-ppm/attachment/5abdeaedb53d2f63c3c2e08c/AS%3A609786693443585%401522395885345/download/conductivity+vs+concentration+NaCl+25+degress.pdf
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3g NaCl auf 1L H2O = 5690 uS/cm @ 25°C
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Also 7,5g auf 0,25L H2O
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Dann 100mL davon mit 900mL H2O auf 1L auffüllen.
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Messwertkalibrierung DIY EC Messgerät:
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Open EC Sensor:
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time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted
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125483,21.06,6018.22,737.27,737.11
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187583,21.12,6018.63,737.87,737.65
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288741,21.19,6018.19,738.09,737.93
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300754,21.23,6018.19,738.04,737.88
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312798,21.29,6018.19,737.98,737.82
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minimum adc raw=737.27
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Shorted EC Sensor:
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time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted
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363992,21.44,6018.52,17411.64,17406.89
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396062,21.50,6018.48,17411.45,17406.83
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407198,21.51,6018.48,17861.44,17856.70
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433216,21.56,6018.52,17381.09,17376.37
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444363,21.56,6018.52,14442.77,14438.85
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516433,21.62,6018.45,17450.95,17446.39
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527600,21.62,6018.45,17861.36,17856.70
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539591,21.64,6018.45,17860.74,17856.07
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550857,21.66,6018.45,17861.28,17856.61
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maximum adc raw=17861.44
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ca. 300mL dest. Wasser in 500mL Becherglas auf Magnetrührer
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Wasser temperiert auf 25°C und durchgehend temperatur gehalten
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Temperatursensor und DIY EC-Probe in Flüssigkeit gehalten
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EC Sensor in Flüssigkeit zur Referenzmessung
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Magnetrührer auf langsamer Stufe (keine Strudelbildung)
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Messwert per Tastendruck erfasst (time,tempReservoir,ECadcCalib,ECadc,ECadcAdjusted)
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zeit
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temperatur d. flüssigkeit
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referenz adc wert (geschalteter fester widerstand statt probe)
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Roher ADC Messwert
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angepasster ADC Messwert (linear gemappt nach abweichung vom referenz adc wert, referenz adc wert vorher ermittelt und eingegeben in code)
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manuell abgelesen: EC wert
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Erster Messwert nur dest. Wasser.
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Weitere Messwerte jew. nach hinzufügen erst wenigen tropfen NaCl Lösung. Später mehr bis zu 10mL pro Messung.
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Bläschen an Elektroden durch pusten entfernt wenn sie sich gebildet haben
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Werte in 20230509_NaCl_raw.csv bzw auswertung in ..ods
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Polynom x. Grades erstellt mit python approximate.py
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polynom in c++ code übernommen und punktuelle ergebnisse aus adc zu ec funktion ausgegeben und geplottet zur kontrolle, ob rechnung funktioniert.
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Dauermessung:
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Start bei EC 980 laut EC Meter
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bei 972921 EC 940 laut EC Meter
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Bläschenbildung an elektroden. Werte nicht genau!
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Temperaturabhängigkeit: TODO
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NaCl Lösung auf etwa 1500uS/cm angemischt
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Im Eiswasserbad gekühlt
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Auf Magnetrührer platziert mit Temperatur und Diy EC-Probe
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Kontinuierlich (alle 30s) messwerte aufgezeichnet
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Bläschenbildung an den Elektroden ab etwa 34°C
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Werte in 20230505_NaCl_temperature.csv
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t=99s: start bei 10.9°C (EC messgerät) (8.5°C laut DS18B20) EC=1364uS/cm (EC messgerät)
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t=219s: erster korrekter calib wert. EC Messgerät: 1416uS/cm @11.4C
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t=851s: 1443uS @15.6°C
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t=1423s: 1553uS @25,3°C
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t=1513s: blaeschen entfernt von ec probe
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ab 30°C viele bläschen
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Binary file not shown.
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@ -8,7 +8,7 @@ import matplotlib.pyplot as plt
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from pandas import *
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# reading CSV file
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data = read_csv("20230509_NaCl_manuell.csv")
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data = read_csv("20230509_NaCl_raw.csv")
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# converting column data to list
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#solutionAdded = data['solutionAdded'].tolist() #in ml
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@ -1,6 +1,6 @@
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#include <Arduino.h>
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bool debug=false; //print Serial information
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bool debug=true; //print Serial information
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#include "helpfunctions.h"
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#include "ADS1X15.h"
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@ -127,7 +127,7 @@ void loop() {
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Serial.println();
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}
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if (loopmillis>last_check+2000 && 1==2) { //check values
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if (loopmillis>last_check+2000) { //check values
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last_check=loopmillis;
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