Hello all,
I have already read about similar problems in various threads, but unfortunately I can't pinpoint the problem with my setup.
As you can see i the pictures the sketch works fine at the beginning, all good. But after some time it will eventually turn into completely corrupted files, even the existing ones, which are then become unreadable.
My setup:
- Arduino MEGA
- Data-Logger shield with built in 3.3V regulator and level shifter Link
- 8 Gb SD-card Fat32 Link
- Arduino Base shield Link
- MH19-C CO2 Sensor (hardware serial) (but not in use with the following sketch)
- MQ-131, -136 - 137 (analog)
- BME280 (I²C)
- Multi-Gas Channel Sensor V1.0 (I²C)
- lcd-display (I²C) (but not in use with the following sketch)
- All powered with an external powersource via MB102 power supply module
My code is build to be very modular, and in fact is working, but for the sake of completeness and, well, even might be the problem after all.
I would be very grateful for your help, I am desperate to know why this keeps happening 
#include "RTClib.h" //SD-Karte
#include <SD.h> //SD-Karte
#include <SPI.h> //SD-Karte
#include <Wire.h> //I2C, Multi-Gas-Channel, BME280, LCD-DIsplay
#include <Adafruit_Sensor.h> // BME280
#include <Adafruit_BME280.h> // BME280
#include "MutichannelGasSensor.h"
#include <MQUnifiedsensor.h> // MQ-131
#include <MQSinglesensor1_136.h> // MQ-136
#include <MQSinglesensor137.h> // MQ-137
#define SEALEVELPRESSURE_HPA (1017.40)// Hier TAGESaktuellen Luftdruck angeben für möglichst genaue Höhenbestimmung //BME280
Adafruit_BME280 bme; // I2C
#define ECHO_TO_SERIAL 1 // echo data to serial port
#define placa "Arduino UNO"
#define Voltage_Resolution 5
#define pin131 A0 //Analog input 0 of your arduino
#define pin136 A1 //Analog input 0 of your arduino
#define pin137 A2 //Analog input 0 of your arduino
#define Modell131 "MQ-131" //MQ131
#define Modell136 "MQ-136" //MQ136
#define Modell137 "MQ-137" //MQ137
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
#define RatioMQ131CleanAir 1 //RS / R0 = 15 ppm
#define RatioMQ136CleanAir 1 //RS / R0 = 15 ppm
#define RatioMQ137CleanAir 1 //RS / R0 = 15 ppm
MQUnifiedsensor MQ131(placa, Voltage_Resolution, ADC_Bit_Resolution, pin131, Modell131);
MQSinglesensor1_ MQ136(placa, Voltage_Resolution, ADC_Bit_Resolution, pin136, Modell136);
MQSinglesensor MQ137(placa, Voltage_Resolution, ADC_Bit_Resolution, pin137, Modell137);
RTC_DS1307 RTC; // define the Real Time Clock object
File logfile;
const int chipSelect = 10; // for the data logging shield, we use digital pin 10 for the SD cs line
unsigned long LOG_StartMillis;
unsigned long currentMillis4;
const unsigned long LOG_interval = 3000; //Interval for writing on the SD
void setup()
{
Serial.begin(9600); // for printing on serial monitor
LOG_StartMillis = millis(); //initial start time
setup_SDLogger();
setup_BME280();
setup_Multi_Gas_Channel();
setup_MQ131();
setup_MQ136();
setup_MQ137();
Serial.println();
}
//----------------------------------------------------------------------------------------------------------
void setup_SDLogger()
{
Serial.print("Initializing SD card..."); // initialize the SD card
pinMode(53, OUTPUT); // make sure that the default chip select pin is set to output, even if you don't use it
if (!SD.begin(chipSelect))
{
error("Card failed, or not present"); // see if the card is present and can be initialized:
}
Serial.println("card initialized.");
char filename[] = "LOGGER00.CSV"; // create a new file
for (uint8_t i = 0; i < 100; i++)
{
filename[6] = i / 10 + '0';
filename[7] = i % 10 + '0';
if (! SD.exists(filename))
{
logfile = SD.open(filename, FILE_WRITE); // only open a new file if it doesn't exist
break; // leave the loop!
}
}
if (! logfile)
{
error("couldnt create file");
}
Serial.print("Logging to: ");
Serial.println(filename);
Wire.begin(); // connect to RTC
if (!RTC.begin())
{
logfile.println("RTC failed");
Serial.println("RTC failed");
}
logfile.println("datetime,Temperatur in °C,Luftdruck in hPa,Luftfeuchtigkeit in %,O3 in ppb,MQ-131 R0 in KΩ,H2S in ppm,MQ-136 R0 in KΩ,NH3 in ppm,MQ-137 R0 in KΩ,CO in ppm,NO in ppm,NH3 in ppm,H2 in ppm");
Serial.println("datetime,Temperatur in °C,Luftdruck in hPa,Luftfeuchtigkeit in %,O3 in ppb,MQ-131 R0 in KΩ,H2S in ppm,MQ-136 R0 in KΩ,NH3 in ppm,MQ-137 R0 in KΩ,CO in ppm,NO in ppm,NH3 in ppm,H2 in ppm");
}
void setup_BME280()
{
bme.begin();
}
void setup_Multi_Gas_Channel ()
{
gas.begin(0x04);
gas.powerOn();
}
void setup_MQ131()
{
MQ131.setRegressionMethod(1); //_PPB = a*ratio^b
MQ131.setA(9.4783); MQ131.setB(2.3348); // Configurate the ecuation values to get O3 concentration
MQ131.init();
MQ131.setRL(1);
Serial.print("Calibrating please wait.");
float calcR0 = 0;
for (int i = 1; i <= 10; i ++)
{
MQ131.update(); // Update data, the arduino will be read the voltage on the analog pin
calcR0 += MQ131.calibrate(RatioMQ131CleanAir);
}
MQ131.setR0(calcR0 / 10);
Serial.println(" done!.");
if (isinf(calcR0)) {
Serial.println("Warning: Conection issue founded, R0 is infite (Open circuit detected) please check your wiring and supply");
while (1);
}
if (calcR0 == 0) {
Serial.println("Warning: Conection issue founded, R0 is zero (Analog pin with short circuit to ground) please check your wiring and supply");
while (1);
}
/***************************** MQ CAlibration ********************************************/
}
void setup_MQ136()
{
MQ136.setRegressionMethod(1); //_PPM = a*ratio^b
MQ136.setA(0.1229); MQ136.setB(-3.873); // Configurate the ecuation values to get H2S concentration
MQ136.init();
MQ136.setRL136(47);
Serial.print("Calibrating please wait.");
float calcR0 = 0;
for (int i = 1; i <= 10; i ++)
{
MQ136.update(); // Update data, the arduino will be read the voltage on the analog pin
calcR0 += MQ136.calibrate(RatioMQ131CleanAir);
}
MQ136.setR0136(calcR0 / 10);
Serial.println(" done!.");
if (isinf(calcR0)) {
Serial.println("Warning: Conection issue founded, R0 is infite (Open circuit detected) please check your wiring and supply");
while (1);
}
if (calcR0 == 0) {
Serial.println("Warning: Conection issue founded, R0 is zero (Analog pin with short circuit to ground) please check your wiring and supply");
while (1);
}
/***************************** MQ CAlibration ********************************************/
}
void setup_MQ137()
{
MQ137.setRegressionMethod(1); //_PPM = a*ratio^b
MQ137.setA(0.1229); MQ137.setB(-3.873); // Configurate the ecuation values to get NH3 concentration
MQ137.init();
MQ137.setRL137(47);
Serial.print("Calibrating please wait.");
float calcR0 = 0;
for (int i = 1; i <= 10; i ++)
{
MQ137.update(); // Update data, the arduino will be read the voltage on the analog pin
calcR0 += MQ137.calibrate(RatioMQ131CleanAir);
}
MQ137.setR0137(calcR0 / 10);
Serial.println(" done!.");
if (isinf(calcR0)) {
Serial.println("Warning: Conection issue founded, R0 is infite (Open circuit detected) please check your wiring and supply");
while (1);
}
if (calcR0 == 0) {
Serial.println("Warning: Conection issue founded, R0 is zero (Analog pin with short circuit to ground) please check your wiring and supply");
while (1);
}
/***************************** MQ CAlibration ********************************************/
}
void error(char *str)
{
Serial.print("error: ");
Serial.println(str);
while (1);
}
//----------------------------------------- All setups above ------------------------------------------------------
void loop()
{
update_MQ131();
update_MQ136();
update_MQ137();
write_on_SD();
}
void update_MQ131()
{
float calcR0 = 0;
for (int i = 1; i <= 10; i ++)
{
MQ131.update(); // Update data, the arduino will be read the voltage on the analog pin
calcR0 += MQ131.calibrate(RatioMQ131CleanAir);
}
MQ131.setR0(calcR0 / 10);
}
void update_MQ136()
{
float calcR0 = 0;
for (int i = 1; i <= 10; i ++)
{
MQ136.update(); // Update data, the arduino will be read the voltage on the analog pin
calcR0 += MQ136.calibrate(RatioMQ136CleanAir);
}
MQ136.setR0136(calcR0 / 10);
}
void update_MQ137()
{
float calcR0 = 0;
for (int i = 1; i <= 10; i ++)
{
MQ137.update(); // Update data, the arduino will be read the voltage on the analog pin
calcR0 += MQ137.calibrate(RatioMQ137CleanAir);
}
MQ137.setR0137(calcR0 / 10);
}
void write_on_SD()
{
currentMillis4 = millis();
DateTime now;
now = RTC.now(); // fetch the time and log it
if (currentMillis4 - LOG_StartMillis >= LOG_interval)
{
logfile.print(now.year(), DEC);
logfile.print("/");
logfile.print(now.month(), DEC);
logfile.print("/");
logfile.print(now.day(), DEC);
logfile.print(" ");
logfile.print(now.hour(), DEC);
logfile.print(":");
logfile.print(now.minute(), DEC);
logfile.print(":");
logfile.print(now.second(), DEC);
logfile.print(", ");
logfile.print(bme.readTemperature());
logfile.print(", ");
logfile.print(bme.readPressure() / 100.0F);
logfile.print(", ");
logfile.print(bme.readHumidity());
logfile.print(", ");
logfile.print(MQ131.readSensor());
logfile.print(", ");
logfile.print(MQ131.getR0());
logfile.print(", ");
logfile.print(MQ136.readSensor());
logfile.print(", ");
logfile.print(MQ136.getR0136());
logfile.print(", ");
logfile.print(MQ137.readSensor());
logfile.print(", ");
logfile.print(MQ137.getR0137());
logfile.print(", ");
logfile.print(gas.measure_CO());
logfile.print(", ");
logfile.print(gas.measure_NO2());
logfile.print(", ");
logfile.print(gas.measure_NH3());
logfile.print(", ");
logfile.print(gas.measure_H2());
logfile.println();
logfile.flush();
#if ECHO_TO_SERIAL
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), 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.print(bme.readTemperature());
Serial.print(", ");
Serial.print(bme.readPressure() / 100.0F);
Serial.print(", ");
Serial.print(bme.readHumidity());
Serial.print(", ");
Serial.print("O3 in ppb: ");
Serial.print(MQ131.readSensor());
Serial.print(", ");
Serial.print("MQ-131 R0: ");
Serial.print(MQ131.getR0());
Serial.print(", ");
Serial.print("H2S in ppm: ");
Serial.print(MQ136.readSensor());
Serial.print(", ");
Serial.print("MQ-136 R0: ");
Serial.print(MQ136.getR0136());
Serial.print(", ");
Serial.print("NH3 in ppm: ");
Serial.print(MQ137.readSensor());
Serial.print(", ");
Serial.print("MQ-137 R0: ");
Serial.print(MQ137.getR0137());
Serial.print(", ");
Serial.print("CO: ");
Serial.print(gas.measure_CO());
Serial.print(", ");
Serial.print("NO2: ");
Serial.print(gas.measure_NO2());
Serial.print(", ");
Serial.print("NH3: ");
Serial.print(gas.measure_NH3());
Serial.print(", ");
Serial.print("H2: ");
Serial.print(gas.measure_H2());
Serial.print(", ");
Serial.println();
Serial.print(logfile.size());
Serial.println();
Serial.println("------------------------------");
#endif
LOG_StartMillis = currentMillis4; //IMPORTANT to save the start time of the current LED state.
}
}
float Sensorreading(char type)
{
float value;
float temp = bme.readTemperature();
if (type == 'H')
{
value = bme.readHumidity();// read humidity
}
else if (type == 'P')
{
value = bme.readPressure() / 100.0F; // read pressure
}
else if (type == 'Q')
{
value = gas.measure_CO(); // read CO Multi-Gas-Cannel
}
else if (type == 'W')
{
value = gas.measure_NO2(); // read NO2 Multi-Gas-Cannel
}
else if (type == 'N')
{
value = gas.measure_NH3(); // read NH3 Multi-Gas-Cannel
}
else if (type == 'M')
{
value = gas.measure_H2(); // read H2 Multi-Gas-Cannel
}
else
{
value = bme.readTemperature();// read temperature
}
return value;
// Bereits verwendete Buchstaben: H, G, N, M, P, Q, W
}
