arduino_programming.cpp

#Arduino programming in C/C++ language to cover following three objectives:
/*To measure values of currents & voltages with a reasonable sampling rate in-order to 
1) Record required Maximas and Minimas
2) Save measured values
3) Communicate (send) two types of data, namely saved data & live data. Saved data: Send values
to memory module, to be stored. Live data: Send live data to the module.
*/

/*
This code is designed to: acquire data, save data and send it to live stream in the main loop
When user sends '6' from Bluetooth serial via mobile app, code sends saved file to mobile for
processing and then again goes back into the main loop
*/


#include <Adafruit_ADS1015.h>
#include <SPI.h>
#include <SD.h>
#include <SoftwareSerial.h>
#include <Wire.h>
#include <stdio.h>
#include <OneWire.h>
#include <DallasTemperature.h>

SoftwareSerial BTserial(1, 0); // RX | TX
String BT_input;
#define ONE_WIRE_BUS 5
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
File dataFile;
Adafruit_ADS1115 ads;
const float VE = 12.29 / 3.376;
const int chipSelect = 4;
int s = 0;
unsigned long start;
unsigned long stop2;
float V;
String comp = "";
float multiplier = 0.125F; //0.1875F; /* ADS1115 @ +/- 6.144V gain (16-bit results) */

void setup() {
  Serial.begin(9600);
  ads.setGain(GAIN_ONE);
  ads.begin();
  while (!Serial)
    ;
  Serial.print("Initializing SD card...");
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    while (1)
      ;
  }
}

void loop() {
  comp = "";
  sensors.setWaitForConversion(false); // makes it async 0
  sensors.requestTemperatures();       // 2
  sensors.setWaitForConversion(true); // 0
  comp += String(sensors.getTempCByIndex(0)) + ";"; // 27
  comp += String((ads.readADC_Differential_0_1()) * multiplier * 1.25) + ";"; // 9
  comp += String(((ads.readADC_Differential_2_3()) * multiplier / 1000) * VE) + ";"; // 8
  dataFile = SD.open("DataLog.txt", FILE_WRITE); // 14
  if (dataFile) {
    dataFile.println(comp); // 3
    dataFile.close();       // 12
    Serial.println(comp);
  } else {
    Serial.println("error opening datalog.txt");
  }
  if (Serial.available()) {
    if (Serial.read() == 6) {
      Serial.flush();
      dataFile = SD.open("DataLog.txt");
      if (dataFile) {
        // read from the file until there's nothing else in it:
        while (dataFile.available()) {
          Serial.write(dataFile.read());
          // Serial.println(dataFile.read());
        }
        // close the file:
        dataFile.close();
        Serial.println("File Closed");
      } else {
        // if the file didn't open, print an error:
        Serial.println("error opening .txt");
      }
    }
  }
}