SD카드의 데이터를 읽고 쓰기가 가능한 모듈입니다. SPI통신을 사용합니다.
연결법 - 5V and Ground
- CS stands for Chip Select also known as SS- and should be connected to pin10 on the arduino.
- MOSI is also know as DI and is connected to pin 11
- MISO is also known as DO and is connected to pin 12
- SCK is also known as CLK and should be connected to pin 13.
SD 라이브러리는 Adafruit 웹사이트에서 다운로드 받을 수 있습니다. https://github.com/adafruit/SD
소스 코드 /* Requires the SD library from the Adafruit website * SD card attached MOSI - pin 11, MISO - pin 12, CLK - pin 13, CS - pin 10 */
#include
const int chipSelect = 10;
File dataFile;
void setup() { // Open serial communications and wait for port to open: Serial.begin(57600); while (!Serial) { ; // wait for serial port to connect. Needed for Leonardo only } Serial.print("Initializing SD card..."); // make sure that the default chip select pin is set to // output, even if you don't use it: pinMode(SS, OUTPUT);
// see if the card is present and can be initialized: if (!SD.begin(chipSelect)) { Serial.println("Card failed, or not present"); // don't do anything more: while (1) ; } Serial.println("card initialized.");
// Open up the file we're going to log to! // create a new file char filename[] = "LOGGER00.TXT"; for (uint8_t i = 0; i < 100; i++) { filename[6] = i / 10 + '0'; filename[7] = i % 10 + '0'; if (! SD.exists(filename)) { // only open a new file if it doesn't exist dataFile = SD.open(filename, FILE_WRITE); break; // leave the loop! } }
if (! dataFile) { Serial.println("couldnt create file"); } Serial.print("Logging to: "); Serial.println(filename); }
int i = 0; //Use this for the counter void loop() { // make a string for assembling the data to log: 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 += ","; } } dataFile.println(dataString); // print to the serial port too: //Serial.println(' '); // The line dataFile.flush() will 'save' the file to the SD card after every // line of data - this will use more power and slow down how much data // you can read but it's safer! // If you want to speed up the system, call flush() less often and it // will save the file only when called and every 512 bytes - every time a sector on the // SD card is filled with data. However, don't depend on the automatic flush! i++; if (i > 50) { //Call every 50 times dataFile.flush(); i = 0; } // Take 1 measurement every 10 milliseconds delay(10); }
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