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Reply To: Arduino datalogger

Home Forums Other Data Loggers Arduino datalogger Reply To: Arduino datalogger

#2081
lilcano
Participant

So i have decided to improve my project by adding a data logger shield from adafruit. can seam to get the data from the attached decagon 5TM sensors. Please can any one help with what i am doing wrong in my sketch.

#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include “RTClib.h”
#include <SDI12.h>

// A simple data logger for the Arduino digital pins

// how many milliseconds between grabbing data and logging it. 1000 ms is once a second
#define LOG_INTERVAL 60000 // 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 60000 // 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

#define DATAPIN 7 // change to the proper pin for sdi-12 data pin, I prefer D7
SDI12 mySDI12(DATAPIN);

// The analog pins that connect to the sensors
//#define photocellPin 0 // analog 0
//#define tempPin 1 // analog 1
//#define BANDGAPREF 14 // special indicator that we want to measure the bandgap

//#define aref_voltage 3.3 // 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_PCF8523 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;

// the logging file
File logfile;
void tmMeasurement(char c);

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”);
#endif //ECHO_TO_SERIAL
}

logfile.println(“millis,stamp,datetime,sensor,ea,vwc,temp “);

#if ECHO_TO_SERIAL
Serial.println(“Sketch for sampling multiple SDI12 sensors”);
Serial.println(“millis,stamp,datetime,sensor,ea,temp”);

#endif //ECHO_TO_SERIAL

Serial.println();
// If you want to set the aref to something other than 5v
//analogReference(EXTERNAL);
delay(1000);
}

void loop(void)
{

//Now lets look at the timestamp
DateTime now;

// 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(‘”‘);
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
//for(char j=’1′;j<=’3’;j++){
tmMeasurement(j);
//}
Serial.println();
}
//delay(1000);
// Now lets look at collecting the data from the sensors

void tmMeasurement(char c){
String command = “”;
float Ea = 0.0;
float temp = 0.0;
float VWC = 0.0;
command += c;
command += “M!”; // SDI-12 measurement command format [address][‘M’][!]
mySDI12.sendCommand(command);
delay(500); // wait a sec
mySDI12.flush();

command = “”;
command += c;
command += “D0!”; // SDI-12 command to get data [address][D][dataOption][!]
mySDI12.sendCommand(command);
delay(500);

if(mySDI12.available() > 0){
int channel = mySDI12.parseInt();
Ea = mySDI12.parseFloat();
temp = mySDI12.parseFloat();

VWC = (4.3e-6*(Ea*Ea*Ea)) – (5.5e-4*(Ea*Ea)) + (2.92e-2 * Ea) – 5.3e-2 ; //the TOPP equation used to calculate VWC

logfile.print(“, “);
logfile.print(channel);
logfile.print(“, “);
logfile.print(Ea);
logfile.print(“, “);
logfile.print(VWC);
logfile.print(“, “);
logfile.print(temp);

#if ECHO_TO_SERIAL
Serial.print(“, “);
Serial.print(channel);
Serial.print(“, “);
Serial.print(Ea);
Serial.print(“, “);
Serial.print(VWC);
Serial.print(“, “);
Serial.print(temp);

#endif //ECHO_TO_SERIAL
/*/analogRead(photocellPin);
//delay(10);
//int photocellReading = analogRead(photocellPin);

//analogRead(tempPin);
//delay(10);
int tempReading = analogRead(tempPin);

// converting that reading to voltage, for 3.3v arduino use 3.3, for 5.0, use 5.0
float voltage = tempReading * aref_voltage / 1024;
float temperatureC = (voltage – 0.5) * 100 ;
float temperatureF = (temperatureC * 9 / 5) + 32;

logfile.print(“, “);
logfile.print(photocellReading);
logfile.print(“, “);
logfile.print(temperatureF);
#if ECHO_TO_SERIAL
Serial.print(“, “);
Serial.print(photocellReading);
Serial.print(“, “);
Serial.print(temperatureF);
#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);
digitalWrite(redLEDpin, LOW);
}
logfile.flush();

}