Hi Philipp
It works. I use the data logger code as below. thanks.
[code]#include <SPI.h>
#include <SD.h>
const int chipSelect = 4;
void setup() {
// Open SerialUSB communications and wait for port to open:
SerialUSB.begin(9600);
while (!SerialUSB) {
; // wait for SerialUSB port to connect. Needed for native USB port only
}
SerialUSB.print(“Initializing SD card…”);
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
SerialUSB.println(“Card failed, or not present”);
// don’t do anything more:
while (1);
}
SerialUSB.println(“card initialized.”);
}
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 += “,”;
}
}
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open(“datalog.txt”, FILE_WRITE);
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
dataFile.close();
// print to the SerialUSB port too:
SerialUSB.println(dataString);
}
// if the file isn’t open, pop up an error:
else {
SerialUSB.println(“error opening datalog.txt”);
}
}
[/code]
Here is the COM port output.
</s>Initializing SD card...card initialized.
744,551,543
567,372,329
743,710,752
424,216,189
693,594,551
341,149,135
489,368,350
625,636,722
382,221,198
735,714,711
323,207,269
<e>