Hôm nay dientuagv giới thiệu đến các bạn 6 bước giao tiếp dữ liệu từ thẻ nhớ thông qua board arduino.

Bước 1: Phần cứng bao gồm

1. Arduino Uno
2. USB Cable type A to B
3. Micro Sd Card Module
4. Female to male jumper wire
5. SD Card

Bước 2: Kết nối phần cứng

Bước 3: Mở chương trình mẫu từ thu viện ( tải thư viện tại đây)

Code mẫu:

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

File myFile;

void setup() {
// Open serial communications and wait for port to open:
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!”);
return;
}
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.
myFile = SD.open(“test.txt”, FILE_WRITE);

// if the file opened okay, write to it:
if (myFile) {
Serial.print(“Writing to test.txt…”);
myFile.println(“testing 1, 2, 3.”);
// close the file:
myFile.close();
Serial.println(“done.”);
} else {
// if the file didn’t open, print an error:
Serial.println(“error opening test.txt”);
}

// re-open the file for reading:
myFile = SD.open(“r2.txt”);
if (myFile) {
Serial.println(“r2.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() {
// nothing happens after setup
}

Bước 4: Chọn cổng Com

Bước 5: Upload Souce Code

Bước 6: Kêt quả