Datalogger sleep code help without adding any additional parts

Using Arduino Project Guidance
1

I have built a data logger and it consumes a great deal of power from the atlas scientific sensors that are all powered off the 5v pin, I do have an RTC module in the build already and the code runs flawlessly. However, I run it off a lipo battery and it only lasts for about 2 days out in the field. I tried delay code but the sensors still drain battery during it. I need to sleep the Arduino but it has to be automatic as the sensor will be deployed out in the wild. This means I cant use a button or anything similar. Any help would be greatly appreciated.

below is entire code

/////////////////////////////////////////////////// RTC //////////////////////////////////////

#include <Wire.h>
#include "Sodaq_DS3231.h"

char weekDay[][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
/////////////////////////////////////////

#include <SoftwareSerial.h> //we have to include the SoftwareSerial library, or else we can't use it
#define Drx 1 //define what pin rx is going to be
#define Dtx 0 //define what pin tx is going to be

SoftwareSerial Dmyserial(Drx, Dtx); //define how the soft serial port is going to work

#define Erx 5 //define what pin rx is going to be
#define Etx 6 //define what pin tx is going to be

SoftwareSerial Emyserial(Erx, Etx); //define how the soft serial port is going to work

String Einputstring = ""; //a string to hold incoming data from the PC
String Esensorstring = ""; //a string to hold the data from the Atlas Scientific product
boolean Einput_string_complete = false; //have we received all the data from the PC
boolean Esensor_string_complete = false; //have we received all the data from the Atlas Scientific product
char *EC; //char pointer used in string parsing
float f_ec; //used to hold a floating point number that is the EC

String Dinputstring = ""; //a string to hold incoming data from the PC
String Dsensorstring = ""; //a string to hold the data from the Atlas Scientific product
String DOVALUE="";
boolean Dinput_string_complete = false; //have we received all the data from the PC
boolean Dsensor_string_complete = false; //have we received all the data from the Atlas Scientific product
float DO; //used to hold a floating point number that is the DO

#include <Wire.h>
#include "Adafruit_MCP9808.h"

// Create the MCP9808 temperature sensor object
Adafruit_MCP9808 tempsensor = Adafruit_MCP9808();

float TEMPVALUE=0;

//////////////////////////////////////////////////// SD CARDS THINGS /////////////////////////////////////

#include <SPI.h>
#include <SD.h>

File fd;
const uint8_t BUFFER_SIZE = 20;
char fileEC[] = "EC.csv"; // SD library only supports up to 8.3 names
char fileDO[] = "DO.csv";
char fileTEMP[] = "TEMP.csv";
char buff[BUFFER_SIZE+2] = ""; // Added two to allow a 2 char peek for EOF state
uint8_t index = 0;

const uint8_t chipSelect = 8;
const uint8_t cardDetect = 9;

enum states: uint8_t { NORMAL, E, EO };
uint8_t state = NORMAL;

bool alreadyBegan = false; // SD.begin() misbehaves if not first call

/////////////////////////////////////////////////////////////////
void setup() {
//
// pinMode(A1, OUTPUT); /// FOR 5V ////
// pinMode(A2, OUTPUT); ///// FOR 5V ///
//
// pinMode(3, OUTPUT); ///// FOR GRND ///
// pinMode(4, OUTPUT); ///// FOR GRND ////
//
// digitalWrite( 3, HIGH); //// MAKING PIN HIGH OR 5V ////
// digitalWrite( A2, HIGH); //// MAKING PIN HIGH OR 5V ////
//
// digitalWrite( 4, LOW); //// MAKING PIN LOW OR 5V ////
// digitalWrite( 7, LOW); //// MAKING PIN LOW OR 5V ////

                                 //set up the hardware

Serial.begin(9600); //set baud rate for the hardware serial port_0 to 9600
Wire.begin();
rtc.begin();

Dmyserial.begin(9600); //set baud rate for the software serial port to 9600
Dinputstring.reserve(10); //set aside some bytes for receiving data from the PC
Dsensorstring.reserve(30); //set aside some bytes for receiving data from Atlas Scientific product

Emyserial.begin(9600);                               //set baud rate for the software serial port to 9600

Einputstring.reserve(10); //set aside some bytes for receiving data from the PC
Esensorstring.reserve(30); //set aside some bytes for receiving data from Atlas Scientific product

if (!tempsensor.begin(0x18)) {
Serial.println(F("Couldn't find MCP9808! Check your connections and verify the address is correct."));
while (1);
}

Serial.println(F("Found MCP9808!"));

tempsensor.setResolution(3); // sets the resolution mode of reading, the modes are defined in the table bellow:

pinMode(cardDetect, INPUT);

initializeCard();
}

void EserialEvent() { //if the hardware serial port_0 receives a char
Einputstring = Serial.readStringUntil(13); //read the string until we see a
Einput_string_complete = true; //set the flag used to tell if we have received a completed string from the PC
}

void DserialEvent() { //if the hardware serial port_0 receives a char
Dinputstring = Serial.readStringUntil(13); //read the string until we see a
Dinput_string_complete = true; //set the flag used to tell if we have received a completed string from the PC
}

int b=0;
void loop() {

 tim();

Serial.println(F(" Let's DO it"));

//here we go...
Serial.println(F(""));
Serial.println(F( " DO SENSOR VALUE"));
Serial.println(F(""));
Dmyserial.begin(9600); //set baud rate for the software serial port to 9600
while( DOS()==0);
delay(100);

     if (!digitalRead(cardDetect))
     {
        initializeCard();
       }

     fd = SD.open(fileDO, FILE_WRITE);
      if (fd) {
        Serial.print(F("Writing to DO.txt..."))

        ; fd.print( DO)
        ;fd.print(",");
       ;tim();

          ; fd.close();
          Serial.println(F("done."));
      } else {

       Serial.println(F("error opening DO.txt"));
       }

/////////////////////////////////////////////////////////////// EC SENSOR //////////////////////////////////
Serial.println(F(""));
Serial.println(F( " CONDUCTIVIY SENSOR VALUE"));
Serial.println(F(","));
Emyserial.begin(9600); //set baud rate for the software serial port to 9600
while ( ECOND()==0);
delay(100);

     if (!digitalRead(cardDetect))
     {
        initializeCard();
       }

     fd = SD.open(fileEC, FILE_WRITE);
      if (fd) {
        Serial.print(F("Writing to EC.txt..."));
         
         ;fd.print( f_ec);
         ;fd.print(",");
         ;tim();

         
          fd.close();
          Serial.println(F("done."));
      } else {

       Serial.println(F("error opening EC.txt"));
       }

     ////////////////////////////////////////////////////////// TEMP ///////////////////////////////////////  
    Serial.println(F(""));
    Serial.println(F( "     TEMPERATURE SENSOR VALUE"));
    Serial.println(F(","));
    MCP();
    

     if (!digitalRead(cardDetect))
     {
        initializeCard();
       }

     fd = SD.open(fileTEMP, FILE_WRITE);
      if (fd) {
        Serial.print(F("Writing to TEMP.txt..."));
            
         ;fd.print( TEMPVALUE);
         ;fd.print(","); 
         ;tim();
         
          fd.close();
          Serial.println(F("done."));
      } else {

       Serial.println(F("error opening TEMP.txt"));
       }

}

///////////////////////////////// DO /////////////////////////////
bool DOS()
{
bool a=0;
if (Dinput_string_complete == true) { //if a string from the PC has been received in its entirety
Dmyserial.print(Dinputstring); //send that string to the Atlas Scientific product
Dmyserial.print('\r'); //add a to the end of the string
Dinputstring = ""; //clear the string
Dinput_string_complete = false; //reset the flag used to tell if we have received a completed string from the PC
}

if (Dmyserial.available() > 0) { //if we see that the Atlas Scientific product has sent a character
char Dinchar = (char)Dmyserial.read(); //get the char we just received
Dsensorstring += Dinchar; //add the char to the var called sensorstring
if (Dinchar == '\r') { //if the incoming character is a
Dsensor_string_complete = true; //set the flag
}
}

if (Dsensor_string_complete == true) { //if a string from the Atlas Scientific product has been received in its entirety
Serial.print(F("DO = "));
Serial.println(Dsensorstring);
DOVALUE = Dsensorstring;
//uncomment this section to see how to convert the DO reading from a string to a float
if (isdigit(Dsensorstring[0])) { //if the first character in the string is a digit
DO = Dsensorstring.toFloat(); //convert the string to a floating point number so it can be evaluated by the Arduino

}

a= Dsensor_string_complete;
Dsensorstring = ""; //clear the string
Dsensor_string_complete = false; //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
}
// Serial.println(a);
return a;
}

//
int ECOND()
{
int a=0;
if (Einput_string_complete == true) { //if a string from the PC has been received in its entirety
Emyserial.print(Einputstring); //send that string to the Atlas Scientific product
Emyserial.print('\r'); //add a to the end of the string
Einputstring = ""; //clear the string
Einput_string_complete = false; //reset the flag used to tell if we have received a completed string from the PC
}

if (Emyserial.available() > 0) { //if we see that the Atlas Scientific product has sent a character
char Einchar = (char)Emyserial.read(); //get the char we just received
Esensorstring += Einchar; //add the char to the var called sensorstring
if (Einchar == '\r') { //if the incoming character is a
Esensor_string_complete = true; //set the flag
}
}

if (Esensor_string_complete == true) { //if a string from the Atlas Scientific product has been received in its entirety
if (isdigit(Esensorstring[0]) == false) { //if the first character in the string is a digit
Serial.println(Esensorstring); //send that string to the PC's serial monitor
}
else //if the first character in the string is NOT a digit
{
Eprint_EC_data(); //then call this function
}
a=Esensor_string_complete;
Esensorstring = ""; //clear the string
Esensor_string_complete = false; //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
}
return a;
}

void Eprint_EC_data(void) { //this function will pars the string

char Esensorstring_array[30]; //we make a char array

char *TDS; //char pointer used in string parsing
char *SAL; //char pointer used in string parsing
char *GRAV; //char pointer used in string parsing

Esensorstring.toCharArray(Esensorstring_array, 30); //convert the string to a char array
EC = strtok(Esensorstring_array, ","); //let's pars the array at each comma
TDS = strtok(NULL, ","); //let's pars the array at each comma
SAL = strtok(NULL, ","); //let's pars the array at each comma
GRAV = strtok(NULL, ","); //let's pars the array at each comma

Serial.print(F("EC:")); //we now print each value we parsed separately
Serial.println(EC); //this is the EC value

Serial.print(F("TDS:")); //we now print each value we parsed separately
Serial.println(TDS); //this is the TDS value

Serial.print(F("SAL:")); //we now print each value we parsed separately
Serial.println(SAL); //this is the salinity value

Serial.print(F("GRAV:")); //we now print each value we parsed separately
Serial.println(GRAV); //this is the specific gravity
//Serial.println(); //this just makes the output easier to read

f_ec= atof(EC); //uncomment this line to convert the char to a float
}

void MCP()
{
// Serial.println("wake up MCP9808.... "); // wake up MCP9808 - power consumption ~200 mikro Ampere
// tempsensor.wake(); // wake up, ready to read!

// Read and print out the temperature, also shows the resolution mode used for reading.
// Serial.print("Resolution in mode: ");
// Serial.println (tempsensor.getResolution());
float c = tempsensor.readTempC();
float f = tempsensor.readTempF();
Serial.print("Temp: ");
Serial.print(c, 4); Serial.print(F("*C\t and "));
Serial.print(f, 4); Serial.println(F("*F."));

TEMPVALUE =tempsensor.readTempF();
// delay(2000);
// Serial.println("Shutdown MCP9808.... ");
// tempsensor.shutdown_wake(1); // shutdown MSP9808 - power consumption ~0.1 mikro Ampere, stops temperature sampling
Serial.println("");
delay(100);
}

//////////////////////////////////////////// CARD /////////////////////
void initializeCard(void)
{
Serial.print(F("Initializing SD card..."));

// Is there even a card?
if (!digitalRead(cardDetect))
{
Serial.println(F("No card detected. Waiting for card."));
while (!digitalRead(cardDetect));
delay(250); // 'Debounce insertion'
}

// Card seems to exist. begin() returns failure
// even if it worked if it's not the first call.
if (!SD.begin(chipSelect) && !alreadyBegan) // begin uses half-speed...
{
Serial.println(F("Initialization failed!"));
initializeCard(); // Possible infinite retry loop is as valid as anything
}
else
{
alreadyBegan = true;
}
Serial.println(F("Initialization done."));

Serial.print(fileEC);
if (SD.exists(fileEC))
{
Serial.println(F(" exists."));
}
else
{
Serial.println(F(" doesn't exist."));
}

Serial.print(fileDO);
if (SD.exists(fileDO))
{
Serial.println(F(" exists."));
}
else
{
Serial.println(F(" doesn't exist. "));
}

Serial.print(fileTEMP);
if (SD.exists(fileTEMP))
{
Serial.println(F(" exists."));
}
else
{
Serial.println(F(" doesn't exist."));
}
Serial.println(F(" CARD INITIALIZATION DONE "));
}

void tim()
{
DateTime now = rtc.now(); //get the current date-time
uint32_t ts = now.getEpoch();

// if (old_ts == 0 || old_ts != ts) {
// old_ts = ts;
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.date(), DEC);
Serial.print(' ');
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.print(' ');

Serial.println();

fd.print(now.year(), DEC);
fd.print('/');
fd.print(now.month(), DEC);
fd.print('/');
fd.print(now.date(), DEC);
fd.print(' ');
fd.print(now.hour(), DEC);
fd.print(':');
fd.print(now.minute(), DEC);
fd.print(':');
fd.print(now.second(), DEC);
fd.print(' ');

;fd.println();
}

2

Please format the code in the IDE. Then copy, use code tags, the symbol </>, and paste.
Could You line up then actual sendors You use? Their current consumption, their start up time after powered up?
Maybe a main power switch?
A wiring diagram could be useful.

3

You can use a mosfet switch to turn on and off the sensors.

You can use the RTC alarm to wake up your processor at any interval, like once a minute or very two hours, whatever.

You must measure the sleeping current and strive to find and eliminate everything that drains the least amount of power, everything not essential, that is.

The RTC can keep time with its backup battery; it too can be turn fully o with a transistor or mosfet switch.

All done and done and done, google is your friend and a good current meter is important.

a7

4 
/////////////////////////////////////////////////// RTC  //////////////////////////////////////


#include <Wire.h>
#include "Sodaq_DS3231.h"

char weekDay[][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
/////////////////////////////////////////


#include <SoftwareSerial.h>                           //we have to include the SoftwareSerial library, or else we can't use it
#define Drx 1                                          //define what pin rx is going to be
#define Dtx 0                                         //define what pin tx is going to be

SoftwareSerial Dmyserial(Drx, Dtx);                      //define how the soft serial port is going to work

#define Erx 5                                          //define what pin rx is going to be
#define Etx 6                                          //define what pin tx is going to be


SoftwareSerial Emyserial(Erx, Etx);                      //define how the soft serial port is going to work


String Einputstring = "";                              //a string to hold incoming data from the PC
String Esensorstring = "";                             //a string to hold the data from the Atlas Scientific product
boolean Einput_string_complete = false;                //have we received all the data from the PC
boolean Esensor_string_complete = false;               //have we received all the data from the Atlas Scientific product
char *EC;                                           //char pointer used in string parsing
  float f_ec;                                         //used to hold a floating point number that is the EC


String Dinputstring = "";                              //a string to hold incoming data from the PC
String Dsensorstring = "";                             //a string to hold the data from the Atlas Scientific product
String DOVALUE="";
boolean Dinput_string_complete = false;                //have we received all the data from the PC
boolean Dsensor_string_complete = false;               //have we received all the data from the Atlas Scientific product
float DO;                                             //used to hold a floating point number that is the DO


#include <Wire.h>
#include "Adafruit_MCP9808.h"

// Create the MCP9808 temperature sensor object
Adafruit_MCP9808 tempsensor = Adafruit_MCP9808();

float TEMPVALUE=0;

//////////////////////////////////////////////////// SD CARDS THINGS /////////////////////////////////////

#include <SPI.h>
#include <SD.h>

File fd;
const uint8_t BUFFER_SIZE = 20;
char fileEC[] = "EC.csv"; // SD library only supports up to 8.3 names
char fileDO[] = "DO.csv";
char fileTEMP[] = "TEMP.csv";
char buff[BUFFER_SIZE+2] = "";  // Added two to allow a 2 char peek for EOF state
uint8_t index = 0;

const uint8_t chipSelect = 8;
const uint8_t cardDetect = 9;

enum states: uint8_t { NORMAL, E, EO };
uint8_t state = NORMAL;

bool alreadyBegan = false;  // SD.begin() misbehaves if not first call


/////////////////////////////////////////////////////////////////
void setup() {  
//
//    pinMode(A1, OUTPUT);     /// FOR 5V ////
//    pinMode(A2, OUTPUT);     ///// FOR 5V ///
//    
//    pinMode(3, OUTPUT);    ///// FOR GRND ///
//    pinMode(4, OUTPUT);    ///// FOR GRND ////
//
    //                             digitalWrite( 3, HIGH); //// MAKING PIN HIGH OR 5V ////
//                                 digitalWrite( A2, HIGH); //// MAKING PIN HIGH OR 5V ////
//                                     
   //                             digitalWrite( 4, LOW); //// MAKING PIN LOW OR 5V ////
//                                digitalWrite( 7, LOW); //// MAKING PIN LOW OR 5V ////

                                                                                                                                     
                                     //set up the hardware
  Serial.begin(9600);                                 //set baud rate for the hardware serial port_0 to 9600
      Wire.begin();
    rtc.begin();
    
  Dmyserial.begin(9600);                               //set baud rate for the software serial port to 9600
  Dinputstring.reserve(10);                            //set aside some bytes for receiving data from the PC
  Dsensorstring.reserve(30);                           //set aside some bytes for receiving data from Atlas Scientific product

    Emyserial.begin(9600);                               //set baud rate for the software serial port to 9600
  Einputstring.reserve(10);                            //set aside some bytes for receiving data from the PC
 Esensorstring.reserve(30);                           //set aside some bytes for receiving data from Atlas Scientific product

  if (!tempsensor.begin(0x18)) {
    Serial.println(F("Couldn't find MCP9808! Check your connections and verify the address is correct."));
    while (1);
  }
    
   Serial.println(F("Found MCP9808!"));

  tempsensor.setResolution(3); // sets the resolution mode of reading, the modes are defined in the table bellow:

    pinMode(cardDetect, INPUT);

  initializeCard();
}

void EserialEvent() {                                  //if the hardware serial port_0 receives a char
 Einputstring = Serial.readStringUntil(13);           //read the string until we see a <CR>
  Einput_string_complete = true;                       //set the flag used to tell if we have received a completed string from the PC
}


void DserialEvent() {                                  //if the hardware serial port_0 receives a char
  Dinputstring = Serial.readStringUntil(13);           //read the string until we see a <CR>
  Dinput_string_complete = true;                       //set the flag used to tell if we have received a completed string from the PC
}

int b=0;
void loop() {   

     tim();
    
  Serial.println(F("                  Let's DO it"));

  sleep(900000)
  
  //here we go...
        Serial.println(F(""));
        Serial.println(F( "    DO SENSOR VALUE"));
        Serial.println(F(""));
        Dmyserial.begin(9600);                               //set baud rate for the software serial port to 9600
        while( DOS()==0);
        delay(100);
        
         if (!digitalRead(cardDetect))
         {
            initializeCard();
           }

         fd = SD.open(fileDO, FILE_WRITE);
          if (fd) {
            Serial.print(F("Writing to DO.txt..."))
    
            ; fd.print( DO)
            ;fd.print(",");
           ;tim();
 
              ; fd.close();
              Serial.println(F("done."));
          } else {
   
           Serial.println(F("error opening DO.txt"));
           }
        
/////////////////////////////////////////////////////////////// EC SENSOR //////////////////////////////////
        Serial.println(F(""));
        Serial.println(F( "    CONDUCTIVIY SENSOR VALUE"));
        Serial.println(F(","));
        Emyserial.begin(9600);                               //set baud rate for the software serial port to 9600
        while ( ECOND()==0);
        delay(100);

         if (!digitalRead(cardDetect))
         {
            initializeCard();
           }

         fd = SD.open(fileEC, FILE_WRITE);
          if (fd) {
            Serial.print(F("Writing to EC.txt..."));
             
             ;fd.print( f_ec);
             ;fd.print(",");
             ;tim();

             
              fd.close();
              Serial.println(F("done."));
          } else {
   
           Serial.println(F("error opening EC.txt"));
           }

         ////////////////////////////////////////////////////////// TEMP ///////////////////////////////////////  
        Serial.println(F(""));
        Serial.println(F( "     TEMPERATURE SENSOR VALUE"));
        Serial.println(F(","));
        MCP();
        

         if (!digitalRead(cardDetect))
         {
            initializeCard();
           }

         fd = SD.open(fileTEMP, FILE_WRITE);
          if (fd) {
            Serial.print(F("Writing to TEMP.txt..."));
                
             ;fd.print( TEMPVALUE);
             ;fd.print(","); 
             ;tim();
             
              fd.close();
              Serial.println(F("done."));
          } else {
   
           Serial.println(F("error opening TEMP.txt"));
           }

}

/////////////////////////////////    DO /////////////////////////////
bool DOS()
{
  bool a=0;
  if (Dinput_string_complete == true) {                //if a string from the PC has been received in its entirety
    Dmyserial.print(Dinputstring);                      //send that string to the Atlas Scientific product
    Dmyserial.print('\r');                             //add a <CR> to the end of the string
    Dinputstring = "";                                 //clear the string
    Dinput_string_complete = false;                    //reset the flag used to tell if we have received a completed string from the PC
  }

  if (Dmyserial.available() > 0) {                     //if we see that the Atlas Scientific product has sent a character
    char Dinchar = (char)Dmyserial.read();              //get the char we just received
    Dsensorstring += Dinchar;                           //add the char to the var called sensorstring
    if (Dinchar == '\r') {                             //if the incoming character is a <CR>
      Dsensor_string_complete = true;                  //set the flag
    }
  }


  if (Dsensor_string_complete == true) {               //if a string from the Atlas Scientific product has been received in its entirety
      Serial.print(F("DO = "));
    Serial.println(Dsensorstring);   
    DOVALUE =    Dsensorstring;              
                                                   //uncomment this section to see how to convert the DO reading from a string to a float 
    if (isdigit(Dsensorstring[0])) {                   //if the first character in the string is a digit
      DO = Dsensorstring.toFloat();                    //convert the string to a floating point number so it can be evaluated by the Arduino
  
    }
   
   a=  Dsensor_string_complete;
    Dsensorstring = "";                                //clear the string
    Dsensor_string_complete = false;                   //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
  }
   // Serial.println(a);
  return a;
}

//
int ECOND()
{
  int a=0;
  if (Einput_string_complete == true) {                //if a string from the PC has been received in its entirety
   Emyserial.print(Einputstring);                      //send that string to the Atlas Scientific product
    Emyserial.print('\r');                             //add a <CR> to the end of the string
    Einputstring = "";                                 //clear the string
    Einput_string_complete = false;                    //reset the flag used to tell if we have received a completed string from the PC
  }

  if (Emyserial.available() > 0) {                     //if we see that the Atlas Scientific product has sent a character
    char Einchar = (char)Emyserial.read();              //get the char we just received
    Esensorstring += Einchar;                           //add the char to the var called sensorstring
    if (Einchar == '\r') {                             //if the incoming character is a <CR>
      Esensor_string_complete = true;                  //set the flag
    }
  }


  if (Esensor_string_complete == true) {               //if a string from the Atlas Scientific product has been received in its entirety
    if (isdigit(Esensorstring[0]) == false) {          //if the first character in the string is a digit
      Serial.println(Esensorstring);                   //send that string to the PC's serial monitor
    }
    else                                              //if the first character in the string is NOT a digit
    {
      Eprint_EC_data();                                //then call this function 
    }
    a=Esensor_string_complete;
   Esensorstring = "";                                //clear the string
    Esensor_string_complete = false;                   //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
  }
  return a;
}

void Eprint_EC_data(void) {                            //this function will pars the string  

  char Esensorstring_array[30];                        //we make a char array
  
  char *TDS;                                          //char pointer used in string parsing
  char *SAL;                                          //char pointer used in string parsing
  char *GRAV;                                         //char pointer used in string parsing

  
  Esensorstring.toCharArray(Esensorstring_array, 30);   //convert the string to a char array 
  EC = strtok(Esensorstring_array, ",");               //let's pars the array at each comma
  TDS = strtok(NULL, ",");                            //let's pars the array at each comma
  SAL = strtok(NULL, ",");                            //let's pars the array at each comma
  GRAV = strtok(NULL, ",");                           //let's pars the array at each comma

  Serial.print(F("EC:"));                                //we now print each value we parsed separately
  Serial.println(EC);                                 //this is the EC value

  Serial.print(F("TDS:"));                               //we now print each value we parsed separately
  Serial.println(TDS);                                //this is the TDS value

  Serial.print(F("SAL:"));                               //we now print each value we parsed separately
  Serial.println(SAL);                                //this is the salinity value

  Serial.print(F("GRAV:"));                              //we now print each value we parsed separately
  Serial.println(GRAV);                               //this is the specific gravity
  //Serial.println();                                   //this just makes the output easier to read
  
f_ec= atof(EC);                                     //uncomment this line to convert the char to a float
}



void MCP()
{
//   Serial.println("wake up MCP9808.... "); // wake up MCP9808 - power consumption ~200 mikro Ampere
//  tempsensor.wake();   // wake up, ready to read!

  // Read and print out the temperature, also shows the resolution mode used for reading.
//  Serial.print("Resolution in mode: ");
//  Serial.println (tempsensor.getResolution());
  float c = tempsensor.readTempC();
  float f = tempsensor.readTempF();
  Serial.print("Temp: "); 
  Serial.print(c, 4); Serial.print(F("*C\t and ")); 
  Serial.print(f, 4); Serial.println(F("*F."));

  TEMPVALUE =tempsensor.readTempF();
 // delay(2000);
//  Serial.println("Shutdown MCP9808.... ");
//  tempsensor.shutdown_wake(1); // shutdown MSP9808 - power consumption ~0.1 mikro Ampere, stops temperature sampling
  Serial.println("");
  delay(100);
}

//////////////////////////////////////////// CARD  /////////////////////
void initializeCard(void)
{
  Serial.print(F("Initializing SD card..."));

  // Is there even a card?
  if (!digitalRead(cardDetect))
  {
    Serial.println(F("No card detected. Waiting for card."));
    while (!digitalRead(cardDetect));
    delay(250); // 'Debounce insertion'
  }

  // Card seems to exist.  begin() returns failure
  // even if it worked if it's not the first call.
  if (!SD.begin(chipSelect) && !alreadyBegan)  // begin uses half-speed...
  {
    Serial.println(F("Initialization failed!"));
    initializeCard(); // Possible infinite retry loop is as valid as anything
  }
  else
  {
    alreadyBegan = true;
  }
  Serial.println(F("Initialization done."));

  Serial.print(fileEC);
  if (SD.exists(fileEC))
  {
    Serial.println(F(" exists."));
  }
  else
  {
    Serial.println(F(" doesn't exist."));
  }
  
  Serial.print(fileDO);
  if (SD.exists(fileDO))
  {
    Serial.println(F(" exists."));
  }
  else
  {
    Serial.println(F(" doesn't exist. "));
  }

  Serial.print(fileTEMP);
  if (SD.exists(fileTEMP))
  {
    Serial.println(F(" exists."));
  }
  else
  {
    Serial.println(F(" doesn't exist."));
  }
 Serial.println(F(" CARD INITIALIZATION DONE "));
}

void tim()
{
      DateTime now = rtc.now(); //get the current date-time
    uint32_t ts = now.getEpoch();

//    if (old_ts == 0 || old_ts != ts) {
//  old_ts = ts;
  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.date(), DEC);
  Serial.print(' ');
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.print(' ');
  
  

  Serial.println();

  fd.print(now.year(), DEC);
 fd.print('/');
 fd.print(now.month(), DEC);
 fd.print('/');
 fd.print(now.date(), DEC);
 fd.print(' ');
 fd.print(now.hour(), DEC);
 fd.print(':');
 fd.print(now.minute(), DEC);
 fd.print(':');
 fd.print(now.second(), DEC);
 fd.print(' ');

 
 
 

 ;fd.println();
}
5

There is the code. I am past the point of lost on how to code a powerdown into the code. My issue is the code works great but lipo battery dies after 2 days due to the 3 sensors pulling non stop power. My problem I need advice/help on is how to internally powerdown the Arduino and all sensors to where they only draw power every 15 minutes.

6

An output pin of the Arduino can control a mosfet that interrupts power to the sensors.

Usually in this case a high side switch using a logic level p channel mosfet.

Google it or search these fora; it is done and done alla time. No tricks.

Repeat - a current meter will speed your progress, no need to wait a few days to see you been drawing 17 mA or whatever...

a7

7

So for one mosfet switch to power all sensors they would need to be on the same breadboard correct?

8

It is your mechanical arrangement.

One mosfet could provide power to all modules that need to be switched on and off, just hook them to the switching point as if you were wiring them to Vcc.

Or. Each module could have its own mosfet circuitry, in which case you’d runVcc out to it as well as the switching signal from the output pin. And ground and the other signals the sensor or whatever required.

Or use multiple output pins and each module could be on and off independently.

Simplest is the first idea above, to use one mosfet at the Arduino to create a switched power line, feed that out to the modules.

You pick.

a7

9

this is life saving, can you give me a rough sketch or something to visualize the first option? I understand it electronically but not the wiring part

10

would I use an N channel mosfet?

11

Depends, haha, doesn’t everything?

Probably a P channel logic level mosfet in a high side switch configuration, see

for more than I know about it!

a7

12

awesome that helped me out a ton, thank you!

13

I can't google/forum search find it yet, would someone please post a link to that nifty sheet showing all ways of hooking up switches, LEDs, transistors and MOSFETs?

You gotta know the one I mean.

Forgive me if it is one of you heavies who has gone to the trouble of making it. I promise to put it someplace I can find it (or my 'puter can, TBH).

I just notice that the Bald Engineer does not use a series resistor, so.

TIA

a7

14

PLEASE go back to ypur first post and highlight the entire scetch. Then hit the </>

15

Don't forget to add an extra batteryi for each LED that is lit.
1 battery and 1 LED is about a month.

16

The linked text is long but wrong. The reasons presented for high side switching are not valid in general. In some situations high side switching may be better (or only possible) but I believe general preference of high side switching is only due to convention and because it is simpler to imagine.

17

Please link to your website where you go into excruciating detail about why he is wrong and you are right. Not.

Please start an interminable discussion right here about why you are right and anyone who cares to differ is wrong. Not.

Imma leave high side switched most of the things I have done.

And leave those I low side switched alone also.

I copy working examples of both. I believe there are valid reasons for the choices I find have been made and they work. Well.

Sorry if that offends you. Not.

a7

18

Every part available is a tool
We just pull the tool out of the bag as we need or want them.
As far as I know, ever H-Bridge is made of 50% high side, not be cause of convention or preference, but because engineering.

19

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