Gyro issue? (GY-521)

[bsvdoom]

So I connected a GY-521 I2C to a Wemos D1 mini.

And the yaw rotates slowly..

Tried with all PID loop freqs, 3.3V and 5V, and I used the latest release, can it be an issue with my gyro, can someone confirm it works fine?

[rtlopez]

Hi @bsvdoom

go to the CLI, type reboot and wait untli you see a line I GYRO BIAS.... Ensure, that gyro is not moving at that time. then place result here.

You can try to slow I2C bus with commands

set i2c_speed 700
save
reboot

you can try eventually 500 or 400.

[bsvdoom]

15:42:14.638 -> # reboot 
15:42:14.638 -> 
15:42:14.638 ->  ets Jan  8 2013,rst cause:2, boot mode:(3,7)
15:42:14.638 -> 
15:42:14.638 -> load 0x4010f000, len 3424, room 16 
15:42:14.638 -> tail 0
15:42:14.638 -> chksum 0x2e
15:42:14.638 -> load 0x3fff20b8, len 40, room 8 
15:42:14.638 -> tail 0
15:42:14.638 -> chksum 0x2b
15:42:14.638 -> csum 0x2b
15:42:14.638 -> v00061dc0
15:42:14.638 -> ~ld
15:42:14.702 -> ������n��r��n|�l�l`��b���b�r��l�nB�n�l`���r�l�l�� I UART 0 0 1 115200 -1 -1 
 
15:42:14.702 ->  I F_CPU 160000000 
 
15:42:14.702 ->  I EEPROM loaded 
 
15:42:14.702 ->  I I2C SETUP 4 5 700 1 
 
15:42:14.702 ->  I I2C DETECT MPU9250 0 
 
15:42:14.702 ->  I I2C DETECT ICM20602 0 
 
15:42:14.831 ->  I I2C DETECT MPU6050 1 
 
15:42:14.831 ->  I I2C DETECT HMC5883 0 
 
15:42:14.831 ->  I I2C DETECT BMP280 0 
 
15:42:14.831 ->  I I2C DETECT BMP085 0 
 
15:42:14.831 ->  I MOTOR CONF 1 0 480 1 
 
15:42:14.831 ->  I MOTOR PIN 0 0 
 
15:42:14.831 ->  I MOTOR PIN 1 14 
 
15:42:14.831 ->  I MOTOR PIN 2 12 
 
15:42:14.831 ->  I MOTOR PIN 3 15 
 
15:42:14.831 ->  I GYRO INIT MPU6050 0 8000 1000 1000 
 
15:42:14.831 ->  I ACCEL INIT MPU6050 501 1995 1 
 
15:42:14.831 ->  I FUSION MAHONY 50 
 
15:42:14.831 ->  I RX PPM 13 1 
 
15:42:43.069 ->  I GYRO BIAS -0.00 0.00 0.00 

After this if i connect to betaflight, it rotates only 1deg/sec, but gyro does not react if i rotate the gy-521.
After reconnecting the Wemos, the same happens as before.

OK, so it was the module,
THIS ONE PRODUCES ERRORS:

THIS ONE WORKS FINE: (immediately biased, no yaw roll)

[rtlopez]

Hi @bsvdoom

15:42:14.831 ->  I RX PPM 13 1 
15:42:43.069 ->  I GYRO BIAS -0.00 0.00 0.00

definately there is something wrong with this gyro. This log shows, that calibration took about 30s, and returned 3x0.0. Normally it should take 2 seconds and bias should lay around +/- 5.0 for each axis.