Hi everybody! I am a beginner with Arduino. But with this project I am working on right now I have the same problem over and over.
Setup:
I got a GY-521 Accelerometer connected to my Arduino.
The internet tells me that I only have to use the SCL and SDA wires, so I did. The sensor is green and everything but when I upload the code, every time I check out the Serial Monitor to see the data I get question marks. Like this
At first It seems to work but then the data turns into question marks. I really don't know how I can fiks this, the only thing I can think of is that maybe my wire.h library is not installed properly or anything.
I've used many different tutorials
for example:
[url=https://howtomechatronics.com/tutorials/arduino/how-i2c-communication-works-and-how-to-use-it-with-arduino/[]https://howtomechatronics.com/tutorials/arduino/how-i2c-communication-works-and-how-to-use-it-with-arduino/[[/url]
Tutorial: How to use the GY-521 module (MPU-6050 breakout board) with the Arduino Uno
When I got this fiksed and got the code well. I want to make a device what works together with an micro SD card reader.
Anyone extra tips for that?
This is the code I was using right now:
#include <Wire.h>
//--- Accelerometer Register Addresses
#define Power_Register 0x2D
#define X_Axis_Register_DATAX0 0x32 // Hexadecima address for the DATAX0 internal register.
#define X_Axis_Register_DATAX1 0x33 // Hexadecima address for the DATAX1 internal register.
#define Y_Axis_Register_DATAY0 0x34
#define Y_Axis_Register_DATAY1 0x35
#define Z_Axis_Register_DATAZ0 0x36
#define Z_Axis_Register_DATAZ1 0x37
int ADXAddress = 0x53; //Device address in which is also included the 8th bit for selecting the mode, read in this case.
int X0,X1,X_out;
int Y0,Y1,Y_out;
int Z1,Z0,Z_out;
float Xa,Ya,Za;
void setup() {
Wire.begin(); // Initiate the Wire library
Serial.begin(9600);
delay(100);
Wire.beginTransmission(ADXAddress);
Wire.write(Power_Register); // Power_CTL Register
// Enable measurement
Wire.write(8); // Bit D3 High for measuring enable (0000 1000)
Wire.endTransmission();
}
void loop() {
// X-axis
Wire.beginTransmission(ADXAddress); // Begin transmission to the Sensor
//Ask the particular registers for data
Wire.write(X_Axis_Register_DATAX0);
Wire.write(X_Axis_Register_DATAX1);
Wire.endTransmission(); // Ends the transmission and transmits the data from the two registers
Wire.requestFrom(ADXAddress,2); // Request the transmitted two bytes from the two registers
if(Wire.available()<=2) { //
X0 = Wire.read(); // Reads the data from the register
X1 = Wire.read();
/* Converting the raw data of the X-Axis into X-Axis Acceleration
- The output data is Two's complement
- X0 as the least significant byte
- X1 as the most significant byte */
X1=X1<<8;
X_out =X0+X1;
Xa=X_out/256.0; // Xa = output value from -1 to +1, Gravity acceleration acting on the X-Axis
}
// Y-Axis
Wire.beginTransmission(ADXAddress);
Wire.write(Y_Axis_Register_DATAY0);
Wire.write(Y_Axis_Register_DATAY1);
Wire.endTransmission();
Wire.requestFrom(ADXAddress,2);
if(Wire.available()<=2) {
Y0 = Wire.read();
Y1 = Wire.read();
Y1=Y1<<8;
Y_out =Y0+Y1;
Ya=Y_out/256.0;
}
// Z-Axis
Wire.beginTransmission(ADXAddress);
Wire.write(Z_Axis_Register_DATAZ0);
Wire.write(Z_Axis_Register_DATAZ1);
Wire.endTransmission();
Wire.requestFrom(ADXAddress,2);
if(Wire.available()<=2) {
Z0 = Wire.read();
Z1 = Wire.read();
Z1=Z1<<8;
Z_out =Z0+Z1;
Za=Z_out/256.0;
}
// Prints the data on the Serial Monitor
Serial.print("Xa= ");
Serial.print(Xa);
Serial.print(" Ya= ");
Serial.print(Ya);
Serial.print(" Za= ");
Serial.println(Za);
}
