Hi, I have similar problem. I'm capturing data using fscanf in Matlab from arduino UNO and MPU6050 and I'm saving data during several hours and get a lot of spikes. You can see the images attached. (Axis X is in seconds)
some lines in my arduino code :
#include "I2Cdev.h"
#include "MPU6050.h"
....
void setup() {
....
#if I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE
Wire.begin();
#elif I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_FASTWIRE
Fastwire::setup(400, true);
#endif
Serial.begin(115200);
....
//config MPU6050
writeByte(MPU6050_ADDRESS, PWR_MGMT_1, 0x00);
writeByte(MPU6050_ADDRESS, CONFIG, 0x01); // Set Low Pass Filter to 188 Hz (1 KHz)
writeByte(MPU6050_ADDRESS, SMPLRT_DIV, 0x09);
void loop() {
uint32_t deltat = millis() - count;
if(deltat >0.01) {
getdataIMU();
Serial.print(ax,8);
//Serial.print(millis());
Serial.print("\t"); // Use this character in MATLAB
Serial.print(ay,8);
Serial.print("\t"); // Use this character in MATLAB
Serial.print(az,8);
Serial.print("\t"); // Use this character in MATLAB
Serial.print(gx,8);
Serial.print("\t"); // Use this character in MATLAB
Serial.print(gy,8);
Serial.print("\t"); // Use this character in MATLAB
Serial.print(gz,8);
Serial.print("\t"); // Use this character in MATLAB
Serial.println(temperature,8);
count = millis();
}
Matlab code:
s = serial('COM4');
set(s, 'InputBufferSize', 16384);
set(s, 'FlowControl', 'none');
set(s, 'BaudRate', 115200);
set(s, 'Parity', 'none');
set(s, 'DataBits', 8);
set(s, 'StopBit', 1);
%set(s, 'Timeout',4);
fopen(s);
s.ReadAsyncMode = 'continuous';
readasync(s);
....
sSerialData = fscanf(s); %read sensor
t = strsplit(sSerialData,'\t'); % same character as the Arduino code
mData(i,1) = str2double(t(1));
....
Why this occurs? some idea?
Thank you very much!
