In this example we connect an SD card to our Arduino, we will log analog readings to a file on the SD card.
SD card
Here is the layout
arduino and sdcard bb
Code
#include <SD.h>
const int chipSelect = 4;
void setup()
{
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect.
}
Serial.print(“Initializing SD card…”);
pinMode(10, OUTPUT);
//iniot SD card
if (!SD.begin(chipSelect))
{
Serial.println(“Card failed, or not present”);
return;
}
Serial.println(“card initialized.”);
}
void loop()
{
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 += “,”;
}
}
// open the file.
File dataFile = SD.open(“data.txt”, FILE_WRITE);
// if the file is available, write to it:
if (dataFile)
{
dataFile.println(dataString);
dataFile.close();
}
// if the file isn’t open
else
{
Serial.println(“error opening data.txt”);
}
}
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