本篇試者將資料寫入SD card中,

SD card接線設定與上一篇File的相同,

加入用dataFile.println()函數將資料寫入,

不過一開始寫不進去的機會很高,因此我加了一個delay(1000),如code中紅色標示,

有增加一些寫入成功的機會,至於失敗的原因還要再研究,

是否是因為我是用接線的方式,或接線太長而影響SPI的傳輸,

首先,打開SD-->Datalogger,

sdlogger 001.jpg  

SD datalogger.ino的code如下:

/*
  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
 modified 9 Apr 2012
 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 = 10;

void setup()
{
 // Open serial communications and wait for port to open:
  Serial.begin(9600);
   while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }


  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.");
 
  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  if (SD.exists("datalog.txt")) {
    Serial.println("datalog.txt exists.");
  }
  else {
    Serial.println("datalog.txt doesn't exist.");
  }
 
  // open a new file and immediately close it:
  Serial.println("Creating datalog.txt...");
 
  File dataFile = SD.open("datalog.txt", FILE_WRITE);
}

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 += ",";
    }
  }

  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);
    delay(1000); -->降低出錯率
  }  
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening datalog.txt");
  }
}

資料寫入的狀況:

sd logger 002.jpg

SD card模組與Arduino UNO Board接線狀況:

sdlogger 003.jpg

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fishark

魚的方舟 * 圖形語言的世界* - LabVIEW 工作室 & APP開發研究室 & Arduino整合開發 -

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  • 暱稱
  • 請問為甚麼我設定每到00秒的時候SD卡自動寫入資料,也就是一分一次,但每次都在開機20秒後無法存取記憶卡,都固定20秒....
  • 徐昀湞
  • 其實只要兩排排針都接到arduion,出錯率是0喔~

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