개요

사진

회로도

샘플 코드

#include <SPI.h>
#include <SD.h>
#include <SoftwareSerial.h>

SoftwareSerial ss(5, 4, false, 256);
const int chipSelect = 2;
void setup()
{
    Serial.begin(9600);
    ss.begin(9600);
    while (!Serial)
    {
        ;
    }
    Serial.println("\nBegin sdcard");
    if (!SD.begin(chipSelect))
    {
        Serial.println("Card failed, or not present");
        return;
    }
    Serial.println("sdcard initialized");
}
void loop()
{
    String response = "";
    File dataFile = SD.open("datalog.txt", FILE_WRITE);
    if (dataFile)
    {
        while (ss.available() > 0)
        {
            char c = ss.read();
            response += c;
        }
        dataFile.print(response);
        dataFile.close();
    }
    else
    {
        Serial.println("error opening datalog.txt");
    }
}