📈 ماموریت ۴۵: ثبت داده

سیم‌کشی

1. Arduino Uno (VCC5) ⟷ SD Card Module (VCC)
2. SD Card Module (GND) ⟷ Arduino Uno (GND1)
3. Arduino Uno (D10) ⟷ SD Card Module (CS)
4. Arduino Uno (D11) ⟷ SD Card Module (MOSI)
5. SD Card Module (MISO) ⟷ Arduino Uno (D12)
6. Arduino Uno (D13) ⟷ SD Card Module (SCK)
7. Arduino Uno (VCC5) ⟷ Potentiometer (VCC)
8. Potentiometer (GND) ⟷ Arduino Uno (GND2)
9. Potentiometer (WIPER) ⟷ Arduino Uno (A0)

کد

// SD card data logger: save the knob every second, then read the file back.
// Select the SD module to see the files on the card.
#include <SPI.h>
#include <SD.h>

const int CS = 10;
int count = 0;

void setup() {
  Serial.begin(9600);
  if (!SD.begin(CS)) {
    Serial.println("SD card not found! Check the wiring.");
    while (true) delay(1000);
  }
  Serial.println("SD card ready.");
}

void loop() {
  int value = analogRead(A0);

  File logFile = SD.open("log.txt", FILE_WRITE);   // opens at the end of the file
  if (logFile) {
    logFile.print(millis() / 1000);
    logFile.print(",");
    logFile.println(value);
    logFile.close();                               // close = really saved
    Serial.print("saved: ");
    Serial.println(value);
  }

  count++;
  if (count % 5 == 0) {                            // every 5 lines, show the file
    Serial.println("--- log.txt ---");
    File f = SD.open("log.txt");
    while (f.available()) Serial.write(f.read());
    f.close();
  }
  delay(1000);
}