Please see the serial_debugger project (https://git.kemonine.info/kemonine/serial_debugger) instead of this project. This project has been replaced by serial_debugger.
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// A simple data logger for the Adafruit Data Logging shield on a mega
// You must edit SdFatConfig.h and set MEGA_SOFT_SPI nonzero
#include <SdFat.h>
#include <SdFatUtil.h> // define FreeRam()
#include <I2cMaster.h>
#include <SoftRTClib.h>
#define CHIP_SELECT 10 // SD chip select pin
#define LOG_INTERVAL 1000 // mills between entries
#define SENSOR_COUNT 3 // number of analog pins to log
#define ECHO_TO_SERIAL 1 // echo data to serial port if nonzero
#define WAIT_TO_START 1 // Wait for serial input in setup()
#define ADC_DELAY 10 // ADC delay for high impedence sensors
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
#if !MEGA_SOFT_SPI
#error set MEGA_SOFT_SPI nonzero in libraries/SdFat/SdFatConfig.h
#endif // MEGA_SOFT_SPI
// Is a Mega use analog pins 4, 5 for software I2C
const uint8_t RTC_SCL_PIN = 59;
const uint8_t RTC_SDA_PIN = 58;
SoftI2cMaster i2c(RTC_SDA_PIN, RTC_SCL_PIN);
#elif defined(__AVR_ATmega32U4__)
#if !LEONARDO_SOFT_SPI
#error set LEONARDO_SOFT_SPI nonzero in libraries/SdFat/SdFatConfig.h
#endif // LEONARDO_SOFT_SPI
// Is a Leonardo use analog pins 4, 5 for software I2C
const uint8_t RTC_SCL_PIN = 23;
const uint8_t RTC_SDA_PIN = 22;
SoftI2cMaster i2c(RTC_SDA_PIN, RTC_SCL_PIN);
#else // defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
// Not Mega use hardware I2C
// enable pull-ups on SDA/SCL
TwiMaster i2c(true);
#endif // defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
RTC_DS1307 RTC(&i2c); // define the Real Time Clock object
// file system object
SdFat sd;
// text file for logging
ofstream logfile;
// Serial print stream
ArduinoOutStream cout(Serial);
// buffer to format data - makes it eaiser to echo to Serial
char buf[80];
//------------------------------------------------------------------------------
#if SENSOR_COUNT > 6
#error SENSOR_COUNT too large
#endif // SENSOR_COUNT
//------------------------------------------------------------------------------
// store error strings in flash to save RAM
#define error(s) sd.errorHalt_P(PSTR(s))
//------------------------------------------------------------------------------
// call back for file timestamps
void dateTime(uint16_t* date, uint16_t* time) {
DateTime now = RTC.now();
// return date using FAT_DATE macro to format fields
*date = FAT_DATE(now.year(), now.month(), now.day());
// return time using FAT_TIME macro to format fields
*time = FAT_TIME(now.hour(), now.minute(), now.second());
}
//------------------------------------------------------------------------------
// format date/time
ostream& operator << (ostream& os, DateTime& dt) {
os << dt.year() << '/' << int(dt.month()) << '/' << int(dt.day()) << ',';
os << int(dt.hour()) << ':' << setfill('0') << setw(2) << int(dt.minute());
os << ':' << setw(2) << int(dt.second()) << setfill(' ');
return os;
}
//------------------------------------------------------------------------------
void setup() {
// For Leonardo
while (!Serial) {}
Serial.begin(9600);
// pstr stores strings in flash to save RAM
cout << endl << pstr("FreeRam: ") << FreeRam() << endl;
#if WAIT_TO_START
cout << pstr("Type any character to start\n");
while (Serial.read() < 0) {}
#endif // WAIT_TO_START
// connect to RTC
if (!RTC.begin()) error("RTC failed");
// set date time callback function
SdFile::dateTimeCallback(dateTime);
DateTime now = RTC.now();
cout << now << endl;
// initialize the SD card
if (!sd.begin(CHIP_SELECT)) sd.initErrorHalt();
// create a new file in root, the current working directory
char name[] = "LOGGER00.CSV";
for (uint8_t i = 0; i < 100; i++) {
name[6] = i/10 + '0';
name[7] = i%10 + '0';
if (sd.exists(name)) continue;
logfile.open(name);
break;
}
if (!logfile.is_open()) error("file.open");
cout << pstr("Logging to: ") << name << endl;
// format header in buffer
obufstream bout(buf, sizeof(buf));
bout << pstr("millis");
bout << pstr(",date,time");
for (uint8_t i = 0; i < SENSOR_COUNT; i++) {
bout << pstr(",sens") << int(i);
}
logfile << buf << endl;
#if ECHO_TO_SERIAL
cout << buf << endl;
#endif // ECHO_TO_SERIAL
}
//------------------------------------------------------------------------------
void loop() {
uint32_t m;
// wait for time to be a multiple of interval
do {
m = millis();
} while (m % LOG_INTERVAL);
// use buffer stream to format line
obufstream bout(buf, sizeof(buf));
// start with time in millis
bout << m;
DateTime now = RTC.now();
bout << ',' << now;
// read analog pins and format data
for (uint8_t ia = 0; ia < SENSOR_COUNT; ia++) {
#if ADC_DELAY
analogRead(ia);
delay(ADC_DELAY);
#endif // ADC_DELAY
bout << ',' << analogRead(ia);
}
bout << endl;
// log data and flush to SD
logfile << buf << flush;
// check for error
if (!logfile) error("write data failed");
#if ECHO_TO_SERIAL
cout << buf;
#endif // ECHO_TO_SERIAL
// don't log two points in the same millis
if (m == millis()) delay(1);
}