プログラム : SDカードに環境データを保存する

 #include <Arduino.h>

#include <SPI.h>

/*

  GND -> GND

  3.3 -> 3.3

  CS -> 5

  MOSI -> 23

  MISO -> 19

  SCK -> 18

*/

#include "sd_read_write.h"

#include "SD_MMC.h"

#define SD_MMC_CMD 15 //Please do not modify it.

#define SD_MMC_CLK 14 //Please do not modify it.

#define SD_MMC_D0  2  //Please do not modify it.

#include "SparkFunBME280.h"

BME280 mySensor;

float valArry[4];

void setup()

{

  Serial.begin(115200);

  Serial.println("Example showing alternate I2C addresses");

  //BME280 setup

  if (mySensor.beginSPI(5) == false) //Begin communication over SPI. Use pin 10 as CS.

  {

    Serial.println("The sensor did not respond. Please check wiring.");

    //while(1); //Freeze

  }else{

    Serial.println("BME280 connected.");

  }

  mySensor.setReferencePressure(101200); //Adjust the sea level pressure used for altitude calculations

  //sdcard setup

  SD_MMC.setPins(SD_MMC_CLK, SD_MMC_CMD, SD_MMC_D0);

  if (!SD_MMC.begin("/sdcard", true, true, SDMMC_FREQ_DEFAULT, 5)) {

    Serial.println("Card Mount Failed");

    return;

  }

  uint8_t cardType = SD_MMC.cardType();

  if(cardType == CARD_NONE){

      Serial.println("No SD_MMC card attached");

      return;

  }

  Serial.print("SD_MMC Card Type: ");

  if(cardType == CARD_MMC){

      Serial.println("MMC");

  } else if(cardType == CARD_SD){

      Serial.println("SDSC");

  } else if(cardType == CARD_SDHC){

      Serial.println("SDHC");

  } else {

      Serial.println("UNKNOWN");

  }

  uint64_t cardSize = SD_MMC.cardSize() / (1024 * 1024);

  Serial.printf("SD_MMC Card Size: %lluMB\n", cardSize);

  if(!SD_MMC.exists("/envData.txt")){

    String s = String("Day,Hour,Min,Temp,Humidity,Pressure,Discomfort_index\n");

    writeFile(SD_MMC, "/envData.txt", s.c_str());

  }

    readFile(SD_MMC, "/envData.txt");

}

void loop()

{

  unsigned long currentTime = millis(); // 現在の時間をミリ秒で取得

  // ミリ秒を秒、分、時間、日に変換

  int seconds = currentTime / 1000;

  int minutes = seconds / 60;

  int hours = minutes / 60;

  int days = hours / 24;

  // 余りを計算して、秒、分、時間を表示

  minutes = minutes % 60;

  hours = hours % 24;

    valArry[0] = mySensor.readTempC();

    valArry[1] = mySensor.readFloatHumidity();

    valArry[2] = mySensor.readFloatPressure()/100;

    //Discomfort index

    valArry[3] = (((0.81*valArry[0] + 0.01*valArry[1]*(0.99*valArry[0]-14.3))+46.3));

    String s = String(days) + ",";

    s = s + String(hours) + ",";

    s = s + String(minutes) + ",";

    s = s + String(valArry[0]) + ",";

    s = s + String(valArry[1]) + ",";

    s = s + String(valArry[2]) + ",";

    s = s + String(valArry[3]) + "\n";

    Serial.print(s.c_str());

    appendFile(SD_MMC, "/envData.txt", s.c_str());

  delay(600000);

}