I am trying to smoke test my Seeeduino XIAO (Arduino-compatible) board with an IMU sensor, the MPU 6050. I mainly care about the accelerometer and gyroscope values.
But when I run my Arduino code on the XIAO, I am only getting -1 values in the Serial Monitor. When I first smoke tested the MPU 6050, I actually saw regular X,Y,Z values (e.g. 123, -456, etc), but it disappeared after a few readings. Both the microcontroller and IMU chips are able to power on, since they both display the LED light. The XIAO seems to display a blue LED light when it is transmitting/receiving data, but I am not entirely sure that is what is going on.
The MPU 6050 communicates via I2C, so I have connected Vcc to 3.3V on the XIAO since I read somewhere that the MPU 6050 runs on 3.3V, Gnd to Gnd, SCL to Pin 5 on the XIAO, SDA to Pin 4, and the INT pin to Pin 2 (not sure if I need the INT pin or not, but I read that it helped clear the buffer I think). Then I have the XIAO connected to my laptop's 5V USB port. Also not sure if I need to connect to 3.3V or 5V from the MPU to the XIAO.
Any idea why I am getting -1 values? I also occasionally get 0 values, but mostly -1s. Here is a snippet of the output I am getting on the Serial Monitor:
12:06:32.476 -> AccX = 0 || AccY = 0 || AccZ = 0 || Temp = 36.53 || GyroX = 0 || GyroY = 0 || GyroZ = 0
12:06:32.578 -> AccX = 0 || AccY = 0 || AccZ = 0 || Temp = 36.53 || GyroX = 0 || GyroY = 0 || GyroZ = 0
12:06:32.681 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:33.057 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:33.159 -> AccX = 0 || AccY = 0 || AccZ = 0 || Temp = 36.53 || GyroX = 0 || GyroY = 0 || GyroZ = 0
12:06:33.465 -> AccX = 0 || AccY = 0 || AccZ = 0 || Temp = 36.53 || GyroX = 0 || GyroY = 0 || GyroZ = 0
12:06:33.566 -> AccX = 0 || AccY = 0 || AccZ = 0 || Temp = 36.53 || GyroX = 0 || GyroY = 0 || GyroZ = 0
12:06:33.738 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:33.841 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:34.014 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:34.390 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:34.492 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:34.596 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:34.699 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:34.903 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:36.378 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:36.480 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:36.584 -> AccX = 0 || AccY = 0 || AccZ = 0 || Temp = 36.53 || GyroX = 0 || GyroY = 0 || GyroZ = 0
12:06:37.064 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:37.710 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:38.122 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:38.257 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:38.393 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:38.529 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
12:06:38.664 -> AccX = -1 || AccY = -1 || AccZ = -1 || Temp = 36.53 || GyroX = -1 || GyroY = -1 || GyroZ = -1
Here is the code I found on some tutorial website: https://www.electronicshub.org/getting-started-arduino-mpu6050/
#include<Wire.h>
const int MPU6050_addr=0x68;
int16_t AccX,AccY,AccZ,Temp,GyroX,GyroY,GyroZ;
void setup(){
Wire.begin();
Wire.beginTransmission(MPU6050_addr);
Wire.write(0x6B);
Wire.write(0);
Wire.endTransmission(true);
Serial.begin(9600);
}
void loop(){
Wire.beginTransmission(MPU6050_addr);
Wire.write(0x3B);
Wire.endTransmission(false);
Wire.requestFrom(MPU6050_addr,14,true);
AccX=Wire.read()<<8|Wire.read();
AccY=Wire.read()<<8|Wire.read();
AccZ=Wire.read()<<8|Wire.read();
Temp=Wire.read()<<8|Wire.read();
GyroX=Wire.read()<<8|Wire.read();
GyroY=Wire.read()<<8|Wire.read();
GyroZ=Wire.read()<<8|Wire.read();
Serial.print("AccX = "); Serial.print(AccX);
Serial.print(" || AccY = "); Serial.print(AccY);
Serial.print(" || AccZ = "); Serial.print(AccZ);
Serial.print(" || Temp = "); Serial.print(Temp/340.00+36.53);
Serial.print(" || GyroX = "); Serial.print(GyroX);
Serial.print(" || GyroY = "); Serial.print(GyroY);
Serial.print(" || GyroZ = "); Serial.println(GyroZ);
delay(100);
}
Attached is my current electronics setup. Yes, I know I should have used a breadboard, but I did not have one on me at the time. The connection was not stable, so maybe that messed with the readings.
