Hello,
I am working on a data logger that writes the data from an MPU6050 to an SD card. I am using an Arduino Nano. I am facing a strange problem. In my setup function, I have code that is supposed to print out all of the files in the directory. If at the end of my setup() function I put in an infinite while loop: while(true){delay(100);}, all of the files are printed. However, if I don’t have that infinite loop there, it prints out about 4 file names and then it behaves as if intercepted a return statement and the setup() method exists prematurely.
I tried changing the infinite loop to a delay(20000); to see if that would “fix” the problem, the program waits 20 seconds before starting loop() as expected, however it seems to skip the Serial.println("File couunt is: " + String(fileCount));
Could anyone explain what is going on? I am sure how a statement that appears at the end of my setup() function could impact the behavior of code that has already executed.
#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include <MPU6050.h>
#include <stdio.h>
#include <string.h>
File output;
MPU6050 accelgyro;
int fileCount = 0;
void setup() {
// Setup Sensor and SD Card
Serial.begin(115200);
Serial.println("~~~~~~MPU DataLogger~~~~~~");
if(!SD.begin(4)){
Serial.println("Failed to start SD Card");
while(true);
}else{
Serial.println("SD Card Ready");
}
pinMode(6, INPUT_PULLUP);
pinMode(7, OUTPUT);
Wire.begin();
accelgyro.initialize();
Serial.println(accelgyro.testConnection()?"MPU6050 Connected":"MPU6050 Not Found");
// Open new file for writing
File dir = SD.open("/");
File f;
while(true){
f = dir.openNextFile();
if(!f){
Serial.println("Breaking");
break;
}
Serial.println("Found file: " + String(f.name()));
fileCount++;
}
output = SD.open("/d_"+String(fileCount)+".dat", FILE_WRITE);
Serial.println("File count is: " + String(fileCount));
while(true){delay(100);} //Program works with this statement, but not without it.
}
int16_t ax, ay, az;
int16_t gx, gy, gz;
int input;
int flag=0;
char buffer[100];
char* format = "%d,%d,%d,%d,%d,%d,%d\n";
long count = 0;
void loop() {
//If count is getting too big, then switch files.
if(count >= 1024){//1073741824){
output.close();
fileCount++;
count = 0;
Serial.println("-----> Switching to file " + String(fileCount) + ".");
output = SD.open("/d_"+String(fileCount)+".dat", FILE_WRITE);
if(!output){
Serial.println("Failed to open file!");
}
}
accelgyro.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
input = digitalRead(6);
if(input != 1){
Serial.println("Switch Toggled, Delaying readings 30 seconds");
flag = (flag == 1)?0:1;
digitalWrite(7, flag);
delay(30000);
}
sprintf(buffer, format, flag, ax, ay, az, gx, gy, gz);
Serial.print(buffer);
int len = strlen(buffer);
count += len;
output.write(buffer, len);
output.flush();
delay(100);
}