Ardurio收集的传感器数据存入sd卡

本章节我们将介绍如何实现将Ardurion收集的传感器数据存入sd卡中（火焰传感器、温湿度传感器为例）

准备器材：
Arduino开发板一块
杜邦线若干
温度传感器、火焰传感器
SD卡模块及一张SD卡

SD卡模块连接示意图

火焰传感器实例代码

#include <SPI.h>

#include <SD.h>

#include<time.h>

int fireSensor = A0;

File myFile;

void setup() {

  // Open serial communications and wait for port to open:

  Serial.begin(9600);

  pinMode(fireSensor,INPUT);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for native USB port only

  }

  Serial.print("Initializing SD card...");

  if (!SD.begin(4)) {

    Serial.println("initialization failed!");

    while (1);

  }

  Serial.println("initialization done.");

  // open the file. note that only one file can be open at a time,

  // so you have to close this one before opening another.

  // re-open the file for reading:

  myFile = SD.open("demo.txt");

/*  if (myFile) {

    Serial.println("zk.txt:");

    // read from the file until there's nothing else in it:

    while (myFile.available()) {

      Serial.write(myFile.read());

    }

    // close the file:

    myFile.close();

  } else {

    // if the file didn't open, print an error:

    Serial.println("error opening test.txt");

  }

***/

}

void loop() {

  String dataString="";

  Serial.println(analogRead(fireSensor));

  int sensor = analogRead(fireSensor);

  dataString += String(sensor);

  dataString += ",";

myFile = SD.open("demo.txt", FILE_WRITE);

  // if the file opened okay, write to it:

  if (myFile) {

    Serial.print("Writing to test.txt...");

    myFile.println(dataString);

    // close the file:

    myFile.close();

    Serial.println("done.");

  } else {

    // if the file didn't open, print an error:

    Serial.println("error opening test.txt");

  }

  delay(5000);//延时5s

}

温湿度传感器实例代码

#include <DHT11.h>

#include <SPI.h>

#include <SD.h>

#include<time.h>

dht11 DHT11;

File myFile;

#define DHT11PIN A0

void setup()

{

  Serial.begin(9600);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for native USB port only

  }

  Serial.print("Initializing SD card...");

  if (!SD.begin(4)) {

    Serial.println("initialization failed!");

    while (1);

  }

  Serial.println("initialization done.");

  myFile = SD.open("zk.txt");

}

void loop()

{

  int chk = DHT11.read(DHT11PIN);

  Serial.print("Read sensor: ");

  switch (chk)

  {

    case DHTLIB_OK:

                Serial.println("OK");

                break;

    case DHTLIB_ERROR_CHECKSUM:

                Serial.println("Checksum error");

                break;

    case DHTLIB_ERROR_TIMEOUT:

                Serial.println("Time out error");

                break;

    default:

                Serial.println("Unknown error");

                break;

  }

  Serial.print("Humidity (%): ");

  Serial.println((float)DHT11.humidity, 2);

//湿度读取

  Serial.print("Temperature (oC): ");

  Serial.println((float)DHT11.temperature, 2);

//温度读取

  String dataString="";

  int Humidity = DHT11.humidity;

  int Temperature = DHT11.temperature;

  dataString += String(Humidity);

  dataString += ".00";

  dataString += ",";

  dataString += String(Temperature);

  dataString += ".00";

myFile = SD.open("demo.txt", FILE_WRITE);

  // if the file opened okay, write to it:

  if (myFile) {

    Serial.print("Writing to test.txt...");

    myFile.println(dataString);

    // close the file:

    myFile.close();

    Serial.println("done.");

  } else {

    // if the file didn't open, print an error:

    Serial.println("error opening test.txt");

}

delay(5000);

}

将代码烧写到Arduino开发板，如果顺利传感器手机的数据成功写入SD卡，我们可以使用读卡器查看SD卡中的内容，如下图：

图片.png

打开demo.txt对传感器收集数据进行分析处理