80 lines
2.1 KiB
C++
80 lines
2.1 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. Pin numbers reflect the default
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SPI pins for Uno and Nano models
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The circuit:
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analog sensors on analog pins 0, 1, and 2
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SD card attached to SPI bus as follows:
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** SDO - pin 11
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** SDI - pin 12
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** CLK - pin 13
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** CS - depends on your SD card shield or module.
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Pin 10 used here for consistency with other Arduino examples
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(for MKR Zero SD: SDCARD_SS_PIN)
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created 24 Nov 2010
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modified 24 July 2020
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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 = 10;
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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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// wait for Serial Monitor to connect. Needed for native USB port boards only:
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while (!Serial);
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Serial.print("Initializing SD card...");
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if (!SD.begin(chipSelect)) {
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Serial.println("initialization failed. Things to check:");
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Serial.println("1. is a card inserted?");
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Serial.println("2. is your wiring correct?");
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Serial.println("3. did you change the chipSelect pin to match your shield or module?");
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Serial.println("Note: press reset button on the board and reopen this Serial Monitor after fixing your issue!");
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while (true);
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}
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Serial.println("initialization done.");
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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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