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| /* |
| 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 0, 1, and 2 |
| * SD card attached to SPI bus as follows: |
| ** MOSI - pin 11 |
| ** MISO - pin 12 |
| ** CLK - pin 13 |
| ** CS - pin 4 |
| |
| created 24 Nov 2010 |
| updated 2 Dec 2010 |
| by Tom Igoe |
| |
| This example code is in the public domain. |
| |
| */ |
| |
| #include <SD.h> |
| |
| // On the Ethernet Shield, CS is pin 4. Note that even if it's not |
| // used as the CS pin, the hardware CS pin (10 on most Arduino boards, |
| // 53 on the Mega) must be left as an output or the SD library |
| // functions will not work. |
| 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."); |
| } |
| |
| void loop() |
| { |
| // make a string for assembling the data to log: |
| String 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); |
| } |
| // if the file isn't open, pop up an error: |
| else { |
| Serial.println("error opening datalog.txt"); |
| } |
| } |