The purpose of this project is to log data from a gyro/accelerometer module and gyro module simultaneously and save the data to a micro SD card. I am using an arduino pro micro, and have wired everything up and have functional code when the arduino is plugged into my computer. However, after I disconnect the arduino from the computer and then reconnect it to the computer, the SD card receives no new data. This also happens when connecting to a 9v battery through the Micro usb port. The end goal is to have this project run purely on battery power, completely disconnected from the computer. I'm unsure whether this is a code or hardware issue, and I would appreciate any thoughts.
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SoftwareSerial.h>
#include <TinyGPS++.h>
File f;
// The TinyGPS++ object
TinyGPSPlus gps;
static const int TXPin = 9, RXPin = 5;
static const uint32_t GPSBaud = 9600;
SoftwareSerial ss(TXPin, RXPin);
String data;
const int MPU_addr=0x68; // I2C address of the MPU-6050
double AcX,AcY,AcZ,Tmp,GyX,GyY,GyZ;
String filename;
char filnum = 'a';
void setup() {
// put your main code here, to run repeatedly:
Serial.begin(9600);
Serial.println("");
delay(100);
Serial.print("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("initialization failed!");
while (1);
}
Serial.println("initialization done.");
Wire.begin();
Wire.beginTransmission(MPU_addr);
Wire.write(0x6B); // PWR_MGMT_1 register
Wire.write(0); // set to zero (wakes up the MPU-6050)
Wire.endTransmission(true);
Serial.begin(9600);
ss.begin(GPSBaud);
filename = "RIDE"+String(filnum)+".txt";
while(SD.exists(filename)){
filnum += 1;
filename = "RIDE"+String(filnum)+".txt";
}
Serial.println("Writing to"+filename);
Serial.println(gps.date.month());
}
void SDwrite(String file, String text){
Serial.begin(9600);
f = SD.open(file, FILE_WRITE);
if (f) {
Serial.print("Writing to " + file + "...");
f.println(text);
// close the file:
Serial.println("done.");
} else {
// if the file didn't open, print an error:
Serial.println("error opening " + file);
}
f.close();
}
void loop() {
if (SD.begin(4)){
Serial.begin(9600);
ss.begin(GPSBaud);
// put your main code here, to run repeatedly:
Wire.beginTransmission(MPU_addr);
Wire.write(0x3B); // starting with register 0x3B (ACCEL_XOUT_H)
Wire.endTransmission(false);
Wire.requestFrom(MPU_addr,14,true); // request a total of 14 registers
AcX=Wire.read()<<8|Wire.read(); // 0x3B (ACCEL_XOUT_H) & 0x3C (ACCEL_XOUT_L)
AcY=Wire.read()<<8|Wire.read(); // 0x3D (ACCEL_YOUT_H) & 0x3E (ACCEL_YOUT_L)
AcZ=Wire.read()<<8|Wire.read(); // 0x3F (ACCEL_ZOUT_H) & 0x40 (ACCEL_ZOUT_L)
Tmp=Wire.read()<<8|Wire.read(); // 0x41 (TEMP_OUT_H) & 0x42 (TEMP_OUT_L)
GyX=Wire.read()<<8|Wire.read(); // 0x43 (GYRO_XOUT_H) & 0x44 (GYRO_XOUT_L)
GyY=Wire.read()<<8|Wire.read(); // 0x45 (GYRO_YOUT_H) & 0x46 (GYRO_YOUT_L)
GyZ=Wire.read()<<8|Wire.read(); // 0x47 (GYRO_ZOUT_H) & 0x48 (GYRO_ZOUT_L)
while (ss.available() > 0)
gps.encode(ss.read());
data = String(AcX)+","+String(AcY)+","+String(AcZ)+","+String(GyX)+","+String(GyY)+","+String(GyZ)+","+String(gps.location.lat())+","+String(gps.location.lng())+","+String(gps.speed.mph())+","+String(gps.time.hour())+","+String(gps.time.minute());
Serial.println(data);
SDwrite(filename, data);
}else{
while(!SD.begin(4)){
Serial.println("SD card Removed");
}
filnum += 1;
filename = "RIDE"+String(filnum)+".txt";
}
}
