Saltware / Mbed 2 deprecated Water Play

Program for the water play project for the course Software Testing Practical 2016 given at the VU University

Dependencies:   mbed DRV88255 TextLCD Ping mbed-rtos

TemperatureController.cpp@58:b5f0c0f305ff, 2016-06-19 (annotated)

Committer:
sbouber1
Date:
Sun Jun 19 22:39:16 2016 +0000
Revision:
58:b5f0c0f305ff
Parent:
43:0abb54448b75
Child:
66:133398875949
update

Who changed what in which revision?

UserRevisionLine numberNew contents of line
6366295 0:dab140a197e0 1 #include "TemperatureController.h"
6366295 0:dab140a197e0 2
sbouber1 58:b5f0c0f305ff 3 static AnalogIn temperature_sensor(p20);
6366295 0:dab140a197e0 4
sbouber1 10:fd4670ec0806 5 float TemperatureController::getValue() {
sbouber1 10:fd4670ec0806 6 return this->temperature;
6366295 0:dab140a197e0 7 }
6366295 0:dab140a197e0 8
sbouber1 58:b5f0c0f305ff 9 std::string TemperatureController::getName() {
sbouber1 10:fd4670ec0806 10 return "TemperatureController";
sbouber1 9:b3674516729d 11 }
sbouber1 9:b3674516729d 12
sbouber1 9:b3674516729d 13 void TemperatureController::update() {
sbouber1 9:b3674516729d 14 this->temperature = readSensor();
sbouber1 9:b3674516729d 15 }
sbouber1 9:b3674516729d 16
sbouber1 58:b5f0c0f305ff 17 // Function reads sensor values and averages NUM_MEASUREMENTS sensor values, as defined in settings.h
sbouber1 58:b5f0c0f305ff 18 float TemperatureController::readSensor() {
6366295 1:eb527bc93b62 19 float analogin_value = 0;
6366295 1:eb527bc93b62 20 float temperature = 0;
6366295 0:dab140a197e0 21
6366295 0:dab140a197e0 22 // Read 0-1.0 value
sbouber1 58:b5f0c0f305ff 23 for(int i = 0; i < NUM_MEASUREMENTS; i++) {
6366295 0:dab140a197e0 24 analogin_value += temperature_sensor.read();
sbouber1 58:b5f0c0f305ff 25 Thread::wait(MEASUREMENT_DELAY);
6366295 0:dab140a197e0 26 }
sbouber1 9:b3674516729d 27
sbouber1 9:b3674516729d 28 // Average N sensor values
sbouber1 58:b5f0c0f305ff 29 analogin_value /= (float) NUM_MEASUREMENTS;
6366295 0:dab140a197e0 30
6366295 0:dab140a197e0 31 temperature = analoginToCelsius(analogin_value);
6366295 0:dab140a197e0 32
6366295 0:dab140a197e0 33 return temperature;
6366295 0:dab140a197e0 34 }
6366295 0:dab140a197e0 35
6366295 0:dab140a197e0 36 // Function converts average sensor value to ppt
sbouber1 58:b5f0c0f305ff 37 float TemperatureController::analoginToCelsius(float analogin_value) {
6366295 1:eb527bc93b62 38 float voltage = 0;
6366295 1:eb527bc93b62 39 float offset = 0;
6366295 1:eb527bc93b62 40 float rt = 0;
6366295 1:eb527bc93b62 41 float logrt = 0;
6366295 1:eb527bc93b62 42 float temperature = 0;
6366295 0:dab140a197e0 43
6366295 0:dab140a197e0 44 // Convert average sensor value to value with range 0-5.0v
6366295 1:eb527bc93b62 45 voltage = analogin_value * 3.3f * (5.0f/3.0f);
joran 43:0abb54448b75 46
6366295 1:eb527bc93b62 47
6366295 1:eb527bc93b62 48 offset = getOffset(voltage);
6366295 1:eb527bc93b62 49 voltage += offset;
6366295 0:dab140a197e0 50
6366295 0:dab140a197e0 51 // Calcuate R_T
6366295 0:dab140a197e0 52 rt = (15000.0f * voltage) / (4.8f - voltage);
6366295 0:dab140a197e0 53
6366295 0:dab140a197e0 54 logrt = log(rt);
6366295 0:dab140a197e0 55 temperature = 1.0 / (0.00102119 + (0.000222468 * logrt) + (0.000000133342 * logrt*logrt*logrt));
6366295 0:dab140a197e0 56
6366295 0:dab140a197e0 57 temperature = temperature - 273.15;
6366295 0:dab140a197e0 58
6366295 0:dab140a197e0 59 return temperature;
6366295 0:dab140a197e0 60 }
6366295 0:dab140a197e0 61
sbouber1 58:b5f0c0f305ff 62 float TemperatureController::getOffset(float voltage) {
6366295 1:eb527bc93b62 63 float denominator_voltage, numerator_voltage, ratio, interpolation;
6366295 1:eb527bc93b62 64
6366295 1:eb527bc93b62 65 float voltage_table[15] = {1.43, 1.55, 1.53, 1.56, 1.62, 1.65, 1.67, 1.73, 1.75, 1.80, 1.82, 1.88, 1.93, 1.98, 2.00};
6366295 1:eb527bc93b62 66 float offset_table[15] = {0.33, 0.33, 0.40, 0.40, 0.39, 0.42, 0.43, 0.41, 0.45, 0.50, 0.54, 0.53, 0.52, 0.53, 0.56};
6366295 1:eb527bc93b62 67
sbouber1 58:b5f0c0f305ff 68 for(int i = 0; i < 14; i++) {
sbouber1 58:b5f0c0f305ff 69 if(voltage_table[i] <= voltage && voltage_table[i+1] >= voltage) {
6366295 1:eb527bc93b62 70 denominator_voltage = voltage_table[i+1] - voltage_table[i];
6366295 1:eb527bc93b62 71 numerator_voltage = voltage - voltage_table[i];
6366295 1:eb527bc93b62 72
sbouber1 58:b5f0c0f305ff 73 if(denominator_voltage != 0) {
6366295 1:eb527bc93b62 74 ratio = numerator_voltage / denominator_voltage;
6366295 1:eb527bc93b62 75
6366295 1:eb527bc93b62 76 interpolation = ((offset_table[i+1] - offset_table[i]) * ratio) + offset_table[i];
6366295 1:eb527bc93b62 77
6366295 1:eb527bc93b62 78 return interpolation;
6366295 1:eb527bc93b62 79 } else {
6366295 1:eb527bc93b62 80 return offset_table[i];
6366295 1:eb527bc93b62 81 }
6366295 1:eb527bc93b62 82 }
6366295 1:eb527bc93b62 83 }
6366295 1:eb527bc93b62 84
sbouber1 58:b5f0c0f305ff 85 if(voltage_table[14] < voltage) {
6366295 1:eb527bc93b62 86 return offset_table[14];
6366295 1:eb527bc93b62 87 } else {
6366295 1:eb527bc93b62 88 return offset_table[0];
6366295 1:eb527bc93b62 89 }
6366295 0:dab140a197e0 90 }