Problem with comparison.
/Modules/Memory/SDcard01B/SW/Arduino/datalogger/datalogger.pde |
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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"); |
} |
} |