#MAKE A GROUND ISOLATOR SERIAL#
#MAKE A GROUND ISOLATOR DRIVER#

#MAKE A GROUND ISOLATOR DRIVER#

If the grounds are disconnected, the voltage the driver 'sees' will be random, since the driver's ground could be, say, 2V above the arduino's ground, completely messing up your logic. It does so by comparing the signal's voltage to its own reference (GND pin). Now, assuming you don't care about that, you just want the motor to not influence the rest of the circuit: the reason you need to connect the grounds is because when the arduino sends a 5V signal, the driver has to understand that it's a 5V signal. For all I know, it could go singularity when you show VDD+0.5V to its I2C pins) You should use some kind of logic shifter or, at the very least, add a ~330 ohms resistor in series with the I2C bus to guarantee that when the arduino outputs 5V, the MPU6050's internal protection diodes survive (don't quote me on that though, the MPU6050's datasheet says nothing about this. Worst case, the arduino's 5V fries the MPU6050. Best case scenario, the MPU6050's 3.3V are not considered high by the arduino. So you were already living on the edge before adding the motor. You have no guarantees that it'll work with a 3.3V device.

Will adding a capacitor in series with the ground of arduino and motor driver solve this problem? If yes, of what value? Īnd here's a link to my motor driver specifications : Linkįirst, the arduino's I2C bus is 5V.

If I separate the ground(motor driver i.e battery) from the arduino the motors do not respond, clearly they need a common ground to work in harmony. Clearly the battery is producing some sort of noise to the arduino, I'm using the lipo to power a motor driver (L298) which controls two motors. Here comes the big problem, the minute I connect a 12V lipo's ground to the arduino ground the MPU6050 stops responding.

#MAKE A GROUND ISOLATOR SERIAL#

All works well now, I get raw values which is processed into angles and finally printed in the serial monitor. I have an MPU6050(gyro sensor which works on 3.3V) which is powered by the Arduino's 3.3V pin and SCA,SCL,INT pins are used with the I2C bus of the Arduino Uno which I believe is also 3.3V, and finally the ground is connected to the Arduino's ground.

I'm have grounding problems (80% sure of it).

Make a ground isolator