| /* | |
| 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 (for MKRZero SD: SDCARD_SS_PIN) | |
| created 24 Nov 2010 | |
| modified 9 Apr 2012 | |
| by Tom Igoe | |
| This example code is in the public domain. | |
| */ | |
| const int chipSelect = 4; | |
| void setup() { | |
| // Open serial communications and wait for port to open: | |
| Serial.begin(9600); | |
| while (!Serial) { | |
| ; // wait for serial port to connect. Needed for native USB port only | |
| } | |
| Serial.print("Initializing SD card..."); | |
| // 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: | |
| while (1); | |
| } | |
| 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"); | |
| } | |
| } | |