GY521 failing with long wire

[DrDiettrich]

@atyshka

The GY521 still fails if the long wires are connected floating,

Use twisted pair cable. Add a capacitor (0.1µF) to the module power connector. Keep the pullup resistors removed, they go to 3.3V instead of 5V.

If nothing helps add an I2C level shifter for the 3.3V MPU6050.