Duy tran / Mbed OS iot_water_monitor_v2

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Dependencies:   easy-connect-v16 Watchdog FP MQTTPacket RecordType-v-16 watersenor_and_temp_code

Sensor/ReadSensor.cpp@40:4356c209c58d, 2018-02-27 (annotated)

Committer:
DuyLionTran
Date:
Tue Feb 27 14:51:18 2018 +0000
Revision:
40:4356c209c58d
Parent:
39:a5ee98bd0050
Child:
41:6aed398adcc4
* version 2.6.8 	02-27-2017: developing DO calibration. DS18B20 temperature sensor is added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DuyLionTran 32:8226837c56ae 1 #include "mbed.h"
DuyLionTran 40:4356c209c58d 2 #include "DS1820.h"
DuyLionTran 32:8226837c56ae 3 #include "ReadSensor.h"
DuyLionTran 38:64e3e9acb49c 4 #include "flash_programming.h"
DuyLionTran 32:8226837c56ae 5
DuyLionTran 36:d0b628087ac8 6 const float SaturationValueTab[41] = { /* saturation dissolved oxygen concentrations at various temperatures */
DuyLionTran 32:8226837c56ae 7 14.46, 14.22, 13.82, 13.44, 13.09,
DuyLionTran 32:8226837c56ae 8 12.74, 12.42, 12.11, 11.81, 11.53,
DuyLionTran 32:8226837c56ae 9 11.26, 11.01, 10.77, 10.53, 10.30,
DuyLionTran 32:8226837c56ae 10 10.08, 9.86, 9.66, 9.46, 9.27,
DuyLionTran 32:8226837c56ae 11 9.08, 8.90, 8.73, 8.57, 8.41,
DuyLionTran 32:8226837c56ae 12 8.25, 8.11, 7.96, 7.82, 7.69,
DuyLionTran 32:8226837c56ae 13 7.56, 7.43, 7.30, 7.18, 7.07,
DuyLionTran 32:8226837c56ae 14 6.95, 6.84, 6.73, 6.63, 6.53,
DuyLionTran 32:8226837c56ae 15 6.41,
DuyLionTran 32:8226837c56ae 16 };
DuyLionTran 32:8226837c56ae 17
DuyLionTran 36:d0b628087ac8 18 float doValue; /* current dissolved oxygen value, unit; mg/L */
DuyLionTran 36:d0b628087ac8 19 float temperature = 25; /* default temperature is 25^C, you can use a temperature sensor to read it */
DuyLionTran 36:d0b628087ac8 20 int analogBuffer[SCOUNT]; /* store the analog value in the array, readed from ADC */
DuyLionTran 36:d0b628087ac8 21 int analogBufferTemp[SCOUNT];
DuyLionTran 36:d0b628087ac8 22 int analogBufferIndex = 0;
DuyLionTran 36:d0b628087ac8 23 int copyIndex = 0;
DuyLionTran 38:64e3e9acb49c 24 float SaturationDoVoltage; /* mV */
DuyLionTran 40:4356c209c58d 25 float SaturationDoTemperature = 27.0; /* ^C */
DuyLionTran 38:64e3e9acb49c 26 float averageVoltage;
DuyLionTran 38:64e3e9acb49c 27 AnalogIn DOSensor(SENSOR_1_PIN);
DuyLionTran 40:4356c209c58d 28 DS1820 probe(SENSOR_2_PIN);
DuyLionTran 32:8226837c56ae 29
DuyLionTran 36:d0b628087ac8 30 int getMedianNum(int bArray[], int iFilterLen) {
DuyLionTran 36:d0b628087ac8 31 int bTab[iFilterLen];
DuyLionTran 36:d0b628087ac8 32 for (uint8_t i = 0; i < iFilterLen; i++) {
DuyLionTran 36:d0b628087ac8 33 bTab[i] = bArray[i];
DuyLionTran 36:d0b628087ac8 34 }
DuyLionTran 38:64e3e9acb49c 35 int i, j;
DuyLionTran 38:64e3e9acb49c 36 int bTemp;
DuyLionTran 36:d0b628087ac8 37 for (j = 0; j < iFilterLen - 1; j++) {
DuyLionTran 36:d0b628087ac8 38 for (i = 0; i < iFilterLen - j - 1; i++) {
DuyLionTran 36:d0b628087ac8 39 if (bTab[i] > bTab[i + 1]) {
DuyLionTran 36:d0b628087ac8 40 bTemp = bTab[i];
DuyLionTran 36:d0b628087ac8 41 bTab[i] = bTab[i + 1];
DuyLionTran 36:d0b628087ac8 42 bTab[i + 1] = bTemp;
DuyLionTran 36:d0b628087ac8 43 }
DuyLionTran 36:d0b628087ac8 44 }
DuyLionTran 36:d0b628087ac8 45 }
DuyLionTran 36:d0b628087ac8 46 if ((iFilterLen & 1) > 0) {
DuyLionTran 36:d0b628087ac8 47 bTemp = bTab[(iFilterLen - 1) / 2];
DuyLionTran 36:d0b628087ac8 48 }
DuyLionTran 36:d0b628087ac8 49 else {
DuyLionTran 36:d0b628087ac8 50 bTemp = (bTab[iFilterLen / 2] + bTab[iFilterLen / 2 - 1]) / 2;
DuyLionTran 36:d0b628087ac8 51 }
DuyLionTran 36:d0b628087ac8 52 return bTemp;
DuyLionTran 36:d0b628087ac8 53 }
DuyLionTran 36:d0b628087ac8 54
DuyLionTran 36:d0b628087ac8 55 void SENSOR_AnalogRead() {
DuyLionTran 38:64e3e9acb49c 56 float analogReadRaw = DOSensor.read();
DuyLionTran 38:64e3e9acb49c 57 float voltageRaw = analogReadRaw*3.3;
DuyLionTran 38:64e3e9acb49c 58 analogBuffer[analogBufferIndex] = (int)((voltageRaw * 1023.0)/5.0);
DuyLionTran 38:64e3e9acb49c 59 printf("Analog read %d %d\r\n", analogBufferIndex, analogBuffer[analogBufferIndex]);
DuyLionTran 36:d0b628087ac8 60 analogBufferIndex++;
DuyLionTran 36:d0b628087ac8 61 if(analogBufferIndex == SCOUNT) {
DuyLionTran 36:d0b628087ac8 62 analogBufferIndex = 0;
DuyLionTran 36:d0b628087ac8 63 }
DuyLionTran 36:d0b628087ac8 64 }
DuyLionTran 36:d0b628087ac8 65
DuyLionTran 36:d0b628087ac8 66 void SENSOR_GetDOValue() {
DuyLionTran 36:d0b628087ac8 67 for(copyIndex = 0; copyIndex < SCOUNT; copyIndex++) {
DuyLionTran 36:d0b628087ac8 68 analogBufferTemp[copyIndex]= analogBuffer[copyIndex];
DuyLionTran 36:d0b628087ac8 69 }
DuyLionTran 36:d0b628087ac8 70 /* read the value more stable by the median filtering algorithm */
DuyLionTran 38:64e3e9acb49c 71 averageVoltage = getMedianNum(analogBufferTemp, SCOUNT) * (float)VREF/1024.0;
DuyLionTran 37:338e3bc04e57 72 printf("Average voltage %.2f\r\n", averageVoltage);
DuyLionTran 36:d0b628087ac8 73 /* calculate the do value, doValue = Voltage / SaturationDoVoltage * SaturationDoValue(with temperature compensation) */
DuyLionTran 39:a5ee98bd0050 74 doValue = (SaturationValueTab[(int)(SaturationDoTemperature + 0.5)] * averageVoltage) / (float)(SaturationDoVoltage);
DuyLionTran 38:64e3e9acb49c 75 float a = 1;
DuyLionTran 38:64e3e9acb49c 76 printf("SaturationDoVoltage %.2f; DO Value %.2f mg/L\r\n", SaturationDoVoltage, doValue/a);
DuyLionTran 36:d0b628087ac8 77 }
DuyLionTran 32:8226837c56ae 78
DuyLionTran 39:a5ee98bd0050 79 void SENSOR_DoCalibration() {
DuyLionTran 32:8226837c56ae 80
DuyLionTran 38:64e3e9acb49c 81 }
DuyLionTran 38:64e3e9acb49c 82
DuyLionTran 38:64e3e9acb49c 83 void SENSOR_ReadDoCharacteristicValues() {
DuyLionTran 39:a5ee98bd0050 84 FP_WriteConfigValues(1255);
DuyLionTran 38:64e3e9acb49c 85 uint32_t int_SaturationDoVoltage = FP_ReadValue(SAT_DO_VOLT_ADDRESS);
DuyLionTran 38:64e3e9acb49c 86 printf("Read SaturationDoVoltage %d\r\n", int_SaturationDoVoltage);
DuyLionTran 38:64e3e9acb49c 87 SaturationDoVoltage = (float)int_SaturationDoVoltage;
DuyLionTran 38:64e3e9acb49c 88 printf("SaturationDoVoltage %f\r\n", SaturationDoVoltage);
DuyLionTran 38:64e3e9acb49c 89 if (FP_ReadValue(SAT_DO_VOLT_ADDRESS) == 0xFF) {
DuyLionTran 38:64e3e9acb49c 90 /* default voltage: 1127V */
DuyLionTran 38:64e3e9acb49c 91 SaturationDoVoltage = 1127.6;
DuyLionTran 38:64e3e9acb49c 92 int_SaturationDoVoltage = (uint32_t)SaturationDoVoltage;
DuyLionTran 38:64e3e9acb49c 93 if ((SaturationDoVoltage - 0.5) >= (float)(int_SaturationDoVoltage)) {
DuyLionTran 38:64e3e9acb49c 94 int_SaturationDoVoltage++;
DuyLionTran 38:64e3e9acb49c 95 }
DuyLionTran 38:64e3e9acb49c 96 printf("SaturationDoVoltage %d\r\n", (uint32_t)int_SaturationDoVoltage);
DuyLionTran 38:64e3e9acb49c 97 FP_WriteConfigValues((uint32_t)(int_SaturationDoVoltage));
DuyLionTran 38:64e3e9acb49c 98 }
DuyLionTran 18:5585365d6951 99 }