Problem with comparison.
/Modules/Memory/SDcard01B/SW/Arduino/datalogger/datalogger.pde
0,0 → 1,80
/*
SD card datalogger
This example shows how to log data from three analog sensors
to an SD card using the SD library.
The circuit:
* analog sensors on analog ins PC0, PC1, and PC2
* SD card attached to SPI bus as follows:
** MOSI - PB3
** MISO - PB4
** CLK - PB5
** CS - PD4
created 24 Nov 2010
updated 2 Dec 2010
by Tom Igoe
This example code is in the public domain.
*/
 
#include <SD.h>
const int chipSelect = 4;
 
void setup()
{
Serial.begin(9600);
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)) {
Serial.println("Card failed, or not present");
// don't do anything more:
return;
}
Serial.println("card initialized.");
}
 
int count;
 
void loop()
{
 
// make a string for assembling the data to log:
String dataString = "$";
delay(100);
dataString += String(count); // print number of measurement
dataString += ",";
 
 
// read three sensors and append to the string:
for (int analogPin = 0; analogPin < 3; analogPin++) {
int sensor = analogRead(analogPin);
dataString += String(sensor);
if (analogPin < 2) {
dataString += ",";
}
}
 
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open("datalog.txt", FILE_WRITE);
 
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
dataFile.close();
// print to the serial port too:
Serial.println(dataString);
count++;
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
}
}