I am able to get only 200hz write speed . An increase in write speed of atleast 500hz will help in my project.
thanks
I WAS NOT ABLE UPLOAD CODE_ sorry
//Codice scrittura solo dati accelerometro
//sostituiamo con i micros() i millis()
#include <SPI.h>
#include <SdFat.h>
#include <Wire.h>
#define SerialMonitor Serial
#define ARDUINO_USD_CS 10 // uSD card CS pin (pin 10 on SparkFun GPS Logger Shield)
#define MAX_LOG_FILES 100 // Number of log files that can be made
char logFileName[13] = “gpslogXX.csv”;
// Data to be logged:
#define LOG_COLUMN_COUNT 7
#define LOG_COLUMN_HEADER
“time,” “Acc.Z,”
#define LOG_RATE 1000 // Log every n microseconds
unsigned long lastLog = 0; // Global var to keep of last time we logged
const int MPU=0x68; // I2C address of the MPU-6050
int16_t AcX,AcY,AcZ;
double z;
// SD definition
SdFat SD;
File dataFile;
void setup()
{
Wire.begin();
Wire.beginTransmission(MPU);
Wire.write(0x6B); // PWR_MGMT_1 register
Wire.write(0); // set to zero (wakes up the MPU-6050)
Wire.endTransmission(true);
SerialMonitor.begin(9600);
updateFileName(); // Each time we start, create a new file, increment the number
// see if the card is present and can be initialized:
if (!SD.begin(ARDUINO_USD_CS))
{
SerialMonitor.println( F(“Error initializing SD card.”) );
} else {
dataFile = SD.open( logFileName, FILE_WRITE );
// Print a header at the top of the new file
dataFile.println( F(LOG_COLUMN_HEADER) );
}
}
void loop()
{
Wire.beginTransmission(MPU);
Wire.write(0x3B); // starting with register 0x3B (ACCEL_XOUT_H)
Wire.endTransmission(false);
Wire.requestFrom(MPU,14,true); // request a total of 14 registers
AcX=Wire.read()<<8;
AcX|= Wire.read(); // 0x3B (ACCEL_XOUT_H) & 0x3C (ACCEL_XOUT_L)
AcY=Wire.read()<<8;
AcY|=Wire.read(); // 0x3D (ACCEL_YOUT_H) & 0x3E (ACCEL_YOUT_L)
AcZ=Wire.read()<<8;
AcZ|=Wire.read(); // 0x3F (ACCEL_ZOUT_H) & 0x40 (ACCEL_ZOUT_L)
// GyX=Wire.read()<<8;
// GyX|=Wire.read(); // 0x43 (GYRO_XOUT_H) & 0x44 (GYRO_XOUT_L)
// GyY=Wire.read()<<8 ;
// GyY|=Wire.read(); // 0x45 (GYRO_YOUT_H) & 0x46 (GYRO_YOUT_L)
// GyZ=Wire.read()<<8;
//GyZ|=Wire.read(); // 0x47 (GYRO_ZOUT_H) & 0x48 (GYRO_ZOUT_L)
if ((lastLog + LOG_RATE) <= micros()) {
z=AcZ/16384.00;
printImuData(dataFile,lastLog,z);
dataFile.flush();
lastLog=micros();
}
}
static void printImuData(Print &printer, unsigned long lastLog,
int16_t AcZ
)
{//Printing the mpu6050 information
printer.print(lastLog); printer.print(",");
// printer.print(AcX); printer.print(",");
// printer.print(AcY); printer.print(",");
printer.println(z,7); // printer.print(",");
// printer.print(GyX); printer.print(",");
// printer.print(GyY); printer.print(",");
// printer.println(GyZ);
}
// updateFileName() - Looks through the log files already present on a card,
// and creates a new file with an incremented file index.
void updateFileName()
{
for (uint8_t i; i < MAX_LOG_FILES; i++)
{
// Set logFileName to “gpslogXX.csv”:
logFileName[6] = (i/10) + ‘0’;
logFileName[7] = (i%10) + ‘0’;
if (!SD.exists(logFileName))
break; // We found our index
SerialMonitor.print(logFileName);
SerialMonitor.println( F(" exists") );
}
SerialMonitor.print( F("File name: ") );
SerialMonitor.println(logFileName);
}