Data Logger didnt work when serial print active, help im stupid

Projects Programming
1

hi im really new at arduino, im making project to data logging voltage and current on my system, im using data logger and rtc module, the issues are here:
when im using the serial monitor to know the state of my system i cant get any reading on my sd card. but when i delete the coe for serial print it works fine, i dont understand where did i go wrong on my code.

int AVS1 = analogRead(A0);// Voltage Sensor // add 0.37 V offset
const int ACS1 = A1; // Current Sensor

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

#include <Wire.h>
#define DS3231_I2C_ADDRESS 0x68

const int chipSelect = 10;   // Set the chip select pin for the SD card module
const float VCC = 5.04; // supply voltage Arduino
const int MODEL = 2;   // enter the model for robojax libary

#include <Robojax_AllegroACS_Current_Sensor.h>
Robojax_AllegroACS_Current_Sensor v_cur_sense(MODEL,ACS1);

float v_vol_sense;
float Vol_meas;

void setup() {
  Wire.begin();
  Serial.begin(9600);
  pinMode(v_vol_sense, INPUT);

  if (!SD.begin(chipSelect)) {
    Serial.println("SD card initialization failed!");
    while (1);
  }

  Serial.println("SD card initialized successfully!");

  // Create and write the headers to the .csv file
  File dataFile = SD.open("data_log.csv", FILE_WRITE);
  if (dataFile) {
    dataFile.println("TIME|VOLTAGE|CURRENT|REL_STAT_A1|REL_STAT_A12|REL_STAT_A2|REL_STAT_B1");
    dataFile.close();
  } else {
    Serial.println("Error opening data_log.csv!");
  }
}

void loop() {

 int second, minute, hour, dayOfWeek, dayOfMonth, month, year;
 getRTCDateTime(second, minute, hour, dayOfWeek, dayOfMonth, month, year);

 float Cur_meas = v_cur_sense.getCurrentAverage(300);// new float for current sensing
 float Print_Cur = Cur_meas;
 float Print_Vol = Vol_meas;
 
 voltage_sensor();

   Serial.print(year);
   Serial.print('/');
   Serial.print(month);
   Serial.print('/');
   Serial.print(dayOfMonth);
   Serial.print(' ');
   Serial.print(hour);
   Serial.print(':');
   Serial.print(minute);
   Serial.print(':');
   Serial.print(second);
   Serial.print("| Tegangan : ");
   Serial.print(Print_Vol, 3);
   Serial.print(" Arus : ");
   Serial.println(Print_Cur, 3);
 
 String dataString = String(hour) + ":" + String(minute) + ":" + String(second) + "|" + String(Vol_meas) + "|" + String(Cur_meas) + "\n";
 saveDataToSDCard(dataString);
 
}

void voltage_sensor(){
  v_vol_sense = analogRead(AVS1);
  Vol_meas  = map(v_vol_sense, 0, 1023, 0, 2500);
  Vol_meas  = Vol_meas/100;
   //if (Vol_meas < 9.7) { // noise??
   //Vol_meas = 0;
   //}
}

void setRTCDateTime(int year, int month, int day, int hour, int minute, int second) {
  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0); // Set alamat pointer ke register 0
  Wire.write(decToBcd(second));
  Wire.write(decToBcd(minute));
  Wire.write(decToBcd(hour));
  Wire.write(decToBcd(getDayOfWeek(day, month, year))); // Hari dalam seminggu (0-6, 0=Sunday)
  Wire.write(decToBcd(day));
  Wire.write(decToBcd(month));
  Wire.write(decToBcd(year - 2000)); // Karena DS3231 hanya mendukung tahun 2000-2099
  Wire.endTransmission();
}

void getRTCDateTime(int& second, int& minute, int& hour, int& dayOfWeek, int& dayOfMonth, int& month, int& year) {
  Wire.beginTransmission(DS3231_I2C_ADDRESS);
  Wire.write(0); // Set alamat pointer ke register 0
  Wire.endTransmission();

  Wire.requestFrom(DS3231_I2C_ADDRESS, 7); // Mintalah 7 byte data

  second = bcdToDec(Wire.read() & 0x7F);
  minute = bcdToDec(Wire.read());
  hour = bcdToDec(Wire.read() & 0x3F);
  dayOfWeek = bcdToDec(Wire.read());
  dayOfMonth = bcdToDec(Wire.read());
  month = bcdToDec(Wire.read());
  year = bcdToDec(Wire.read()) + 2000;
}

byte decToBcd(byte val) {
  return ((val / 10 * 16) + (val % 10));
}

byte bcdToDec(byte val) {
  return ((val / 16 * 10) + (val % 16));
}

int getDayOfWeek(int day, int month, int year) {
  // Algoritma Zeller's Congruence untuk mendapatkan hari dalam seminggu
  if (month < 3) {
    month += 12;
    year--;
  }
  int k = year % 100;
  int j = year / 100;
  int h = (day + 13 * (month + 1) / 5 + k + k / 4 + j / 4 + 5 * j) % 7;
  return (h + 5) % 7; // Karena Zeller's Congruence menetapkan 0 = Saturday, 1 = Sunday, ..., 6 = Friday
}

String getDayOfWeekName(int dayOfWeek) {
  switch (dayOfWeek) {
    case 6: return "Minggu";
    case 5: return "Monday";
    case 4: return "Tuesday";
    case 3: return "Wednesday";
    case 2: return "Thursday";
    case 1: return "Friday";
    case 0: return "Sabtu";
    default: return "Unknown";
  }
}

void saveDataToSDCard(String data) {
  File dataFile = SD.open("data_log.csv", FILE_WRITE);
  if (dataFile) {
    dataFile.print(data);
    dataFile.close();
  } 
}
2

these are the message on my ide does the capacity effect the arduino ?

Global variables use 1639 bytes (80%) of dynamic memory, leaving 409 bytes for local variables. The maximum is 2048 bytes.
Low memory available, stability issues may occur.

3

Yes, in this case particularly, as you use a lot of String manipulation. If you're on an Uno or Nano, as I expect you are, those manipulations will chew through available memory.
See

for more information.
Ultimately, the solution is to allocate a buffer for your string, and write the various contents to that buffer, then send that to screen and SD. Then, next iteration, re-use the buffer. That results in no new memory allocation, and therefore no crashes.

1 Like
4

oh i can see the problem here, im trying to use other uno board to distribute the memorry issuses, probably will be using 2 uno after this, one is for control and other for data logging. thx for the information

5

Well, your problem is easily solvable with one Uno, and you will find that doing such a simple task with two Unos introduces more complexity and problems than it has solved. But, since you seem to have made a decision, I wish you luck!

6

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