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

SalinityController.cpp@4:4011a1562a77, 2016-06-08 (annotated)

Committer:
6366295
Date:
Wed Jun 08 13:16:32 2016 +0000
Revision:
4:4011a1562a77
Parent:
1:eb527bc93b62
Child:
6:067e999b9c6e
Changed ppt formula

Who changed what in which revision?

UserRevisionLine numberNew contents of line
6366295 0:dab140a197e0 1 #include "SalinityController.h"
6366295 0:dab140a197e0 2
6366295 0:dab140a197e0 3 AnalogIn salinity_sensor(p19);
6366295 0:dab140a197e0 4
6366295 0:dab140a197e0 5 SalinityController::SalinityController()
6366295 0:dab140a197e0 6 {
6366295 0:dab140a197e0 7 printf("Initiate Salinity Controller\r\n");
6366295 0:dab140a197e0 8 }
6366295 0:dab140a197e0 9
6366295 0:dab140a197e0 10 // Function reads sensor values and averages N sensor values
6366295 0:dab140a197e0 11 float SalinityController::readSensor()
6366295 0:dab140a197e0 12 {
6366295 0:dab140a197e0 13 float analogin_value = 0;
6366295 0:dab140a197e0 14 float ppt = 0;
6366295 0:dab140a197e0 15
6366295 0:dab140a197e0 16 // Read 0-1.0 value
6366295 0:dab140a197e0 17 for(int i = 0; i < N; i++)
6366295 0:dab140a197e0 18 {
6366295 0:dab140a197e0 19 analogin_value += salinity_sensor.read();
6366295 0:dab140a197e0 20 }
6366295 0:dab140a197e0 21 // Average 10 sensor values
6366295 0:dab140a197e0 22 analogin_value /= (float) N;
6366295 0:dab140a197e0 23
6366295 0:dab140a197e0 24 ppt = analoginToPPT(analogin_value);
6366295 0:dab140a197e0 25
6366295 0:dab140a197e0 26 return ppt;
6366295 0:dab140a197e0 27 }
6366295 0:dab140a197e0 28
6366295 0:dab140a197e0 29 // Function converts average sensor value to ppt
6366295 0:dab140a197e0 30 float SalinityController::analoginToPPT(float analogin_value)
6366295 0:dab140a197e0 31 {
6366295 0:dab140a197e0 32 float voltage = 0;
6366295 0:dab140a197e0 33 float ppt = 0;
6366295 0:dab140a197e0 34
6366295 0:dab140a197e0 35 // Convert average sensor value to value with range 0-5.0v
6366295 0:dab140a197e0 36 voltage = analogin_value * 3.3f * (5.0f/3.0f);
6366295 0:dab140a197e0 37
6366295 1:eb527bc93b62 38 printf("Sensor Voltage: %f \t", voltage);
6366295 1:eb527bc93b62 39
6366295 0:dab140a197e0 40 // Convert voltage to ppt
6366295 4:4011a1562a77 41 // ppt = voltage * 16.3;
6366295 4:4011a1562a77 42 ppt = voltage * 15.1747217178 - 2.89491343498;
6366295 0:dab140a197e0 43
6366295 0:dab140a197e0 44 return ppt;
6366295 0:dab140a197e0 45 }
6366295 0:dab140a197e0 46
6366295 0:dab140a197e0 47 // Function prints salinity sensor value in ppt
6366295 0:dab140a197e0 48 void SalinityController::displayPPT()
6366295 0:dab140a197e0 49 {
6366295 0:dab140a197e0 50 float ppt = 0;
6366295 0:dab140a197e0 51
6366295 0:dab140a197e0 52 ppt = readSensor();
6366295 0:dab140a197e0 53
6366295 0:dab140a197e0 54 printf("Salinity: %f ppt\t", ppt);
6366295 0:dab140a197e0 55 }