85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
/*
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SD card datalogger
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This example shows how to log data from three analog sensors
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to an SD card using the SD library.
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The circuit:
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analog sensors on analog ins 0, 1, and 2
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SD card attached to SPI bus as follows:
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** MOSI - pin 11
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** MISO - pin 12
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** CLK - pin 13
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** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)
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created 24 Nov 2010
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modified 9 Apr 2012
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by Tom Igoe
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This example code is in the public domain.
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*/
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#include <SPI.h>
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#include <SD.h>
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const int chipSelect = 4;
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void setup() {
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// Open serial communications and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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Serial.print("Initializing SD card...");
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// see if the card is present and can be initialized:
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if (!SD.begin(chipSelect)) {
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Serial.println("Card failed, or not present");
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// don't do anything more:
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while (1);
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}
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Serial.println("card initialized.");
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}
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void loop() {
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// make a string for assembling the data to log:
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String dataString = "";
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// read three sensors and append to the string:
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for (int analogPin = 0; analogPin < 3; analogPin++) {
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int sensor = analogRead(analogPin);
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dataString += String(sensor);
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if (analogPin < 2) {
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dataString += ",";
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}
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}
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// open the file. note that only one file can be open at a time,
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// so you have to close this one before opening another.
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File dataFile = SD.open("datalog.txt", FILE_WRITE);
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// if the file is available, write to it:
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if (dataFile) {
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dataFile.println(dataString);
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dataFile.close();
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// print to the serial port too:
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Serial.println(dataString);
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}
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// if the file isn't open, pop up an error:
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else {
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Serial.println("error opening datalog.txt");
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}
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}
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