Help with GY-521 Module

Other Hardware Sensors
1

I have purchased a GY-521 module, and I was hoping to make a plane that gives me constant readings about the angle of the plane. But when I was testing this accelerometer, I was only getting a spike when I quickly moved the gyroscope to one side, and the numbers quickly went back down even while I was not moving the gyroscope. I want readings that will stay remain consistent if the gyroscope is not moving. Am I doing something wrong? Thanks!

Here is my code:

#include<Wire.h>
const int MPU=0x68; 
int16_t AcX,AcY,AcZ,Tmp,GyX,GyY,GyZ;

void setup(){
  Wire.begin();
  Wire.beginTransmission(MPU);
  Wire.write(0x6B); 
  Wire.write(0);    
  Wire.endTransmission(true);
  Serial.begin(9600);
}
void loop(){
  Wire.beginTransmission(MPU);
  Wire.write(0x3B);  
  Wire.endTransmission(false);
  Wire.requestFrom(MPU,12,true);  
  AcX=Wire.read()<<8|Wire.read();    
  AcY=Wire.read()<<8|Wire.read();  
  AcZ=Wire.read()<<8|Wire.read();  
  GyX=Wire.read()<<8|Wire.read();  
  GyY=Wire.read()<<8|Wire.read();  
  GyZ=Wire.read()<<8|Wire.read();  
  
  Serial.print("Accelerometer: ");
  Serial.print("X = "); Serial.print(AcX);
  Serial.print(" | Y = "); Serial.print(AcY);
  Serial.print(" | Z = "); Serial.println(AcZ); 
  
  Serial.print("Gyroscope: ");
  Serial.print("X = "); Serial.print(GyX);
  Serial.print(" | Y = "); Serial.print(GyY);
  Serial.print(" | Z = "); Serial.println(GyZ);
  Serial.println(" ");
  delay(333);
}
2

The rate gyro drifts, depending on the temperature and other factors. To cancel the drift you need to determine the rate gyro offsets and subtract them from subsequent readings.

3

How would I go about doing that?

4

Most people add up a few hundred readings from each axis and average them. Google "rate gyro calibration" for more ideas.

5

Ok, thanks!

6

This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.