Dziś łączymy moduł karty SD z Arduino. Inicjujemy, zapisujemy i odczytujemy plik tekstowy na pustej karcie SD. Moja karta ma 1 GB pamięci i została sformatowana do FAT32.
Uwaga! W sklepie Bootland zauważyłem ostrzeżenia, że łącząc moduł z Arduino (Uno) trzeba zastosować konwerter napięć. Podobno można spalić kartę. Zaryzykowałem, nic się nie spaliło (jak dotąd). Może jest podobnie jak z wyświetlaczem Nokii, kto nie wie temu działa na 5V.;)
Czytnik kupiłem w sklepie Hipros.
Polecam znakomity tutorial ze strony „Henry’s Bench”. Kody poniżej pochodzą właśnie stamtąd.
Schemat połączeń modułu z Arduino Uno:
GND-GND
MISO-D12
SCK-D13
MOSI-D11
CS-D10
5V-5V
Kod1:
//Henry's Bench
// LC Studio SD Card Initializing Tutorial
//Connections: MOSI - pin 11, MISO - pin 12, CLK - pin 13, CS - pin 10
#include <SD.h>
#include <SPI.h>
int cs = 10; // Set Chip Select to pin ten
void setup()
{
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
}
Serial.println("Initializing SD card...");
Serial.println();
pinMode(cs, OUTPUT);
// Documentation says you're supposed to do this
// even if you don't use it:
pinMode(SS, OUTPUT);
// see if the card is present and can be initialized:
if (!SD.begin(cs)) {
Serial.println("SD did not initiliaze");
while (1) ;
}
Serial.println("SD initialized.");
}
void loop()
{
}Kod2:
//Henry's Bench
// LC Studio SD Card Create and Write to File Tutorial
//Connections: MOSI - pin 11, MISO - pin 12, CLK - pin 13, CS - pin 10
#include <SD.h>
#include <SPI.h>
int cs = 10; // Set Chip Select to pin ten
File myFile; // a File Object
void setup()
{
//
char myFileName[] = "MyFile.txt"; // The name of the file we will create
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
}
Serial.println("Initializing SD card...");
Serial.println();
pinMode(cs, OUTPUT);
// Documentation says you're supposed to do this
// even if you don't use it:
pinMode(SS, OUTPUT);
// see if the card is present and can be initialized:
if (!SD.begin(cs)) {
Serial.println("SD did not initiliaze");
while (1) ;
}
Serial.println("SD initialized.");
// Lets check to make sure that the SD card doesn't already have our file
if (! SD.exists(myFileName)){
// This next statement will open a file for writing if it exists
// If it does not exist, it will create that file. That's what we're doing here.
myFile = SD.open(myFileName, FILE_WRITE);
// This next statement checks to see if the file
myFile.println("My 1st Line of Data"); // Send Your First Line to that file
myFile.flush(); // Save it.
}
else{
// We got here because the file already exists.
// Therefore we're simple opening the file and writing to it. We will add another line at the end.
myFile = SD.open(myFileName, FILE_WRITE);
myFile.println("Another Line of Data"); // Send Your First Line to that file
myFile.flush();
}
Serial.println("Done Writing");
}
void loop()
{
}Kod3:
//Henry's Bench
// LC Studio SD Card Read From File Tutorial
//Connections: MOSI - pin 11, MISO - pin 12, CLK - pin 13, CS - pin 10
#include <SD.h>
#include <SPI.h>
int cs = 10; // Set Chip Select to pin ten
File myFile; // a File Object
void setup()
{
//
char myFileName[] = "MyFile.txt"; // The name of the file we will create
String LineString = "";
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
}
Serial.println("Initializing SD card...");
Serial.println();
pinMode(cs, OUTPUT);
// Documentation says you're supposed to do this
// even if you don't use it:
pinMode(SS, OUTPUT);
// see if the card is present and can be initialized:
if (!SD.begin(cs)) {
Serial.println("SD did not initiliaze");
while (1) ;
}
Serial.println("SD initialized.");
Serial.println();
Serial.println("Reading MyFile.txt...");
Serial.println();
// Open our File for Reading
myFile = SD.open(myFileName, FILE_READ);
// Keep Reading String until there are no more
while (myFile.available() != 0) {
// read the string until we have a newline
// Careful on using this where you don't have newlines.
LineString = myFile.readStringUntil('\n');
Serial.println(LineString);
}
myFile.close();
Serial.println();
Serial.println("Done");
}
void loop()
{
}