Hi.
I have build a datalogger based on an arduino uno, and the sd shield from sparkfun.
It is logging 2 pressures from 2 different pressure transducers.
The problem is that, in the last 2 pulls it crashed after approxemately 10 minutters. Before that i did'nt have any problems.
Is the problem due to programming isues, or du you think it is because of vibrations from the 1000 HP turbo charged diesel engine.??
this is my code
#include <SD.h>
#include <Wire.h>
#include "RTClib.h"
// A simple data logger for the Arduino analog pins
// how many milliseconds between grabbing data and logging it. 1000 ms is once a second
#define LOG_INTERVAL 1000 // mills between entries (reduce to take more/faster data)
// how many milliseconds before writing the logged data permanently to disk
// set it to the LOG_INTERVAL to write each time (safest)
// set it to 10*LOG_INTERVAL to write all data every 10 datareads, you could lose up to
// the last 10 reads if power is lost but it uses less power and is much faster!
#define SYNC_INTERVAL 1000 // mills between calls to flush() - to write data to the card
uint32_t syncTime = 0; // time of last sync()
#define ECHO_TO_SERIAL 1 // echo data to serial port
#define WAIT_TO_START 0 // Wait for serial input in setup()
// the digital pins that connect to the LEDs
#define redLEDpin 2
#define greenLEDpin 3
// The analog pins that connect to the sensors
//#define pressurePin0 0 // analog 0
//#define pressurePin1 1 // analog 1
#define BANDGAPREF 14 // special indicator that we want to measure the bandgap
//#define aref_voltage 5.0 // we tie 3.3V to ARef and measure it with a multimeter!
#define bandgap_voltage 1.1 // this is not super guaranteed but its not -too- off
RTC_DS1307 RTC; // define the Real Time Clock object
// for the data logging shield, we use digital pin 10 for the SD cs line
const int chipSelect = 10;
int pressurePin0 = 0;
int pressurePin1 = 1;
// the logging file
File logfile;
void error(char *str)
{
Serial.print("error: ");
Serial.println(str);
// red LED indicates error
digitalWrite(redLEDpin, HIGH);
while(1);
}
void setup(void)
{
Serial.begin(9600);
Serial.println();
// use debugging LEDs
pinMode(redLEDpin, OUTPUT);
pinMode(greenLEDpin, OUTPUT);
#if WAIT_TO_START
Serial.println("Type any character to start");
while (!Serial.available());
#endif //WAIT_TO_START
// initialize the SD card
Serial.print("Initializing SD card...");
// make sure that the default chip select pin is set to
// output, even if you don't use it:
pinMode(10, OUTPUT);
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
error("Card failed, or not present");
}
Serial.println("card initialized.");
// create a new file
char filename[] = "LOGGER00.CSV";
for (uint8_t i = 0; i < 100; i++) {
filename[6] = i/10 + '0';
filename[7] = i%10 + '0';
if (! SD.exists(filename)) {
// only open a new file if it doesn't exist
logfile = SD.open(filename, FILE_WRITE);
break; // leave the loop!
}
}
if (! logfile) {
error("couldnt create file");
}
Serial.print("Logging to: ");
Serial.println(filename);
// connect to RTC
Wire.begin();
if (!RTC.begin()) {
logfile.println("RTC failed");
#if ECHO_TO_SERIAL
Serial.println("RTC failed");
RTC.adjust(DateTime(2014, 8, 8, 23, 1, 0));
#endif //ECHO_TO_SERIAL
}
logfile.println("millis,datetime,pressureTurbo,pressure2,vcc");
#if ECHO_TO_SERIAL
Serial.println("millis,datetime,pressureTurbo,pressure2,vcc");
#endif //ECHO_TO_SERIAL
// If you want to set the aref to something other than 5v
// analogReference(EXTERNAL);
}
void loop(void)
{
// delay for the amount of time we want between readings
delay((LOG_INTERVAL -1) - (millis() % LOG_INTERVAL));
digitalWrite(greenLEDpin, HIGH);
// log milliseconds since starting
uint32_t m = millis();
logfile.print(m); // milliseconds since start
logfile.print(", ");
#if ECHO_TO_SERIAL
Serial.print(m); // milliseconds since start
Serial.print(", ");
#endif
// fetch the time
//now = RTC.now();
// log time
//logfile.print(now.unixtime()); // seconds since 1/1/1970
//logfile.print(", ");
//logfile.print('"');
DateTime now = RTC.now();
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('"');
#if ECHO_TO_SERIAL
Serial.print(now.unixtime()); // seconds since 1/1/1970
Serial.print(", ");
Serial.print('"');
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('"');
#endif //ECHO_TO_SERIAL
//analogRead(pressurePin0);
//delay(10);
int pressure0Reading = analogRead(pressurePin0);
//analogRead(pressurePin1);
//delay(10);
int pressure1Reading = analogRead(pressurePin1);
// converting that reading to voltage, for 3.3v arduino use 3.3, for 5.0, use 5.0
float voltage0 = pressure0Reading * 5.0 / 1023;
float voltage1 = pressure1Reading * 5. / 1023;
float pressure0ReadingActual = voltage0 * 4 ;
float pressure1ReadingActual = voltage1 * 4;
logfile.print(", ");
logfile.print(pressure0ReadingActual);
logfile.print(", ");
logfile.print(pressure1ReadingActual);
#if ECHO_TO_SERIAL
Serial.print(", ");
Serial.print(pressure0ReadingActual);
Serial.print(", ");
Serial.print(pressure1ReadingActual);
#endif //ECHO_TO_SERIAL
// Log the estimated 'VCC' voltage by measuring the internal 1.1v ref
analogRead(BANDGAPREF);
delay(10);
int refReading = analogRead(BANDGAPREF);
float supplyvoltage = (bandgap_voltage * 1024) / refReading;
logfile.print(", ");
logfile.print(supplyvoltage);
#if ECHO_TO_SERIAL
Serial.print(", ");
Serial.print(supplyvoltage);
#endif // ECHO_TO_SERIAL
logfile.println();
#if ECHO_TO_SERIAL
Serial.println();
#endif // ECHO_TO_SERIAL
digitalWrite(greenLEDpin, LOW);
// Now we write data to disk! Don't sync too often - requires 2048 bytes of I/O to SD card
// which uses a bunch of power and takes time
if ((millis() - syncTime) < SYNC_INTERVAL) return;
syncTime = millis();
// blink LED to show we are syncing data to the card & updating FAT!
digitalWrite(redLEDpin, HIGH);
logfile.flush();
digitalWrite(redLEDpin, LOW);
}
best regards
Bastian