Im making GPS tracker, but i have a lot of issues with my SD module. Im new to arduino and this is my first post so i may dont understand a lot of things, please be patient.
When i started doing this project most of the time i couldnt initialize SD, after some research i found this video:, so i bought 1 and 2 GB SD cards ithat replaced of my old 8 GB micro SDHC. Looks like its working sometimes depending on connections.
if i use GND near MISO as only ground then it doesnt work at all.
if i use "back" (closer to the edge) pins it doesnt work at all.
I tested it with external power source to power arduino and it works sometimes. does initialize 80% of the times, but saves only something like 1% of data
When im powering it via arduino it does initialize, it says that first log is saved, but its not and it doesnt save anything after that.
it doesnt matter if i use 3.3V or 5V as power.
also i found that delays makes it save more data.
Im using SD library examples
SD card datalogger
This example shows how to log data from three analog sensors
to an SD card using the SD library.
The circuit:
analog sensors on analog ins 0, 1, and 2
SD card attached to SPI bus as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)
created 24 Nov 2010
modified 9 Apr 2012
by Tom Igoe
This example code is in the public domain.
*/
#include <SPI.h>
#include <SD.h>
const int chipSelect = 4;
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...");
// 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.");
}
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 += ",";
}
}
delay(200);
// 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);
delay(200);
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
delay(300);
dataFile.close();
// print to the serial port too:
Serial.println(dataString);
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
}
}
