Hi everyone, I am new in Arduino project but want to make air quality monitoring for my office. In this project I am using Arduino mega, OLED display, DS1307 RTC, DHT11 sensor, MQ sensor and one SD card module. I am using the below code and able to display time, temperature, humidity, air quality percentage. But problem is here that SD card stops storage after 4MB of data. Again when I format the SD card it's start storage but stop after 4MB of data storage and serial monitor show ""error opening datalog.txt". Would you please support how to solve the issue.
:
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSans9pt7b.h>
#include <Fonts/FreeMonoOblique9pt7b.h>
#include <DHT.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#include <SD.h> // for the SD card
#include <RTClib.h> // for the RTC
#define OLED_RESET 3 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#define sensor A0
#define DHTPIN 2 // Digital pin 2
#define DHTTYPE DHT11 // DHT 11
int gasLevel = 0; //int variable for gas level
String quality ="";
DHT dht(DHTPIN, DHTTYPE);
//Logger
const int chipSelect = 53;
// Create a file to store the data
File myFile;
// RTC
RTC_DS1307 rtc;
void setup() {
Serial.begin(9600);
pinMode(sensor,INPUT);
dht.begin();
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c)) { // Address 0x3D for 128x64
Serial.println(F("SSD1306 allocation failed"));
}
display.clearDisplay();
display.setTextColor(WHITE);
display.setTextSize(2);
display.setCursor(50, 0);
display.println("Air");
display.setTextSize(1);
display.setCursor(23, 20);
display.println("Qulaity monitor");
display.display();
delay(1200);
display.clearDisplay();
display.setTextSize(2);
display.setCursor(20, 20);
display.println("BY Kazi");
display.display();
delay(1000);
display.clearDisplay();
//logger
// setup for the RTC
while(!Serial); // for Leonardo/Micro/Zero
if(! rtc.begin()) {
Serial.println("Couldn't find RTC");
//while (1);
}
//else {
// following line sets the RTC to the date & time this sketch was compiled
//rtc.adjust(DateTime(F(DATE), F(TIME)));
//}
if(! rtc.isrunning()) {
Serial.println(F("RTC is NOT running!"));
}
// setup for the SD card
Serial.print(F("Initializing SD card..."));
if(!SD.begin(chipSelect)) {
Serial.println(F("initialization failed!"));
return;
}
Serial.println(F("initialization done."));
//open file
myFile=SD.open("DATALOG.txt", FILE_WRITE);
// if the file opened ok, write to it:
if (myFile) {
Serial.println(F("File opened ok"));
// print the headings for our data
myFile.println(F("Date,Time,Temperature ºC"));
}
myFile.close();
}
void sendSensor()
{
float h = dht.readHumidity();
float t = dht.readTemperature();
if (isnan(h) || isnan(t)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
display.setTextColor(WHITE);
display.setTextSize(1);
display.setFont();
display.setCursor(0, 43);
display.println("Temp :");
display.setCursor(80, 43);
display.println(t);
display.setCursor(114, 43);
display.println("C");
display.setCursor(0, 56);
display.println("RH :");
display.setCursor(80, 56);
display.println(h);
display.setCursor(114, 56);
display.println("%");
//logger
//debugging purposes
Serial.print(F("Temperature: "));
Serial.print(t);
Serial.println(" *C");
//Serial.print(f);
//Serial.println(" *F\t");
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.println(F(" %"));
Serial.print(gasLevel);
Serial.println(F(" %"));
myFile = SD.open("DATALOG.txt", FILE_WRITE);
if (myFile) {
Serial.println(F("open with success"));
display.setCursor(105,23);
display.println("ok");
myFile.print(t);
myFile.println(",");
myFile.print(h);
myFile.println(",");
myFile.print(gasLevel);
myFile.close();
delay(2000);
}
else {
Serial.println(F("error opening datalog.txt"));
display.setCursor(105,23);
display.println("Nok");
}
}
void loggingTime() {
DateTime now = rtc.now();
myFile = SD.open("DATALOG.txt", FILE_WRITE);
if (myFile) {
myFile.print(now.year(), DEC);
myFile.print('/');
myFile.print(now.month(), DEC);
myFile.print('/');
myFile.print(now.day(), DEC);
myFile.print(',');
myFile.print(now.hour(), DEC);
myFile.print(':');
myFile.print(now.minute(), DEC);
myFile.print(':');
myFile.print(now.second(), DEC);
myFile.print(",");
}
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.println(now.day(), DEC);
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.println(now.second(), DEC);
myFile.close();
delay(1000);
}
void air_sensor()
{
DateTime now = rtc.now();
gasLevel = analogRead(sensor);
if(gasLevel<181){
quality = " GOOD!";
}
else if (gasLevel >181 && gasLevel<225){
quality = " Poor!";
}
else if (gasLevel >225 && gasLevel<300){
quality = "Very bad!";
}
else if (gasLevel >300 && gasLevel<350){
quality = "ur dead!";
}
else{
quality = " Toxic";
}
display.setTextColor(WHITE);
display.setTextSize(1);
display.setCursor(1,5);
display.setFont();
display.println("Date:");
display.setCursor(35,5);
display.println(now.day(), DEC);
display.setCursor(45,5);
display.println('/');
display.setCursor(50,5);
display.println(now.month(), DEC);
display.setCursor(55,5);
display.println('/');
display.setCursor(60,5);
display.println(now.year(), DEC);
display.setCursor(90,5);
display.println(now.hour(), DEC);
display.setCursor(100,5);
display.println(":");
display.setCursor(105,5);
display.println(now.minute(), DEC);
display.setTextSize(1);
display.setCursor(1,23);
display.println("Air Quality:");
display.setCursor(70,23);
display.setFont(&FreeMonoOblique9pt7b);
display.println(gasLevel);
}
void loop() {
display.clearDisplay();
air_sensor();
sendSensor();
loggingTime();
display.display();
}
