I am trying to connect more than 2 MPU6050s to a single 5v Arduino Pro Mini. After reading all the guides I could find, I'm still not sure how to wire the sensors and the Arduino together. I don't want to do any permanent damage to the modules, so I'm here to ask if the wiring on the picture is correct or not, and if not, what should I change? I would like to use 6 MPU6050's but only 3 is shown just to simplify the picture.
Please don't bother with Fritzing diagrams. A photo of a hand drawn wiring diagram is much preferred.
Each module requires an I/O line to be connected to AD0. It is your responsibility to see that only one module at a time has the correct value of AD0, and that one will respond to requests.
Finally, you MAY NOT connect a 3.3V sensor to a 5V Arduino without a level shifter of some sort. Doing so can destroy both the module and the Arduino.
The idea is okay, but you need a 3.3V Arduino board.
Can you replace the Pro Mini with a 3.3V 8MHz version ?
Those modules have a 3.3V I2C bus, because SDA and SCL are directly connected to the MPU-6050 sensor.
The AD0 is also connected to the MPU-6050 sensor, you may not put a 5V from a Arduino digital output into that.
Can you give a link to where you bought those modules ? Perhaps the combined pullup resistors of those six modules is too much pullup.
This is the website, it's romanian. Also, I don't know if it changes anything, but I have mpu 6500s not mpu6050s, but decided to refer to them as 6050s, because I use their drivers, since i couldn't find much information about the 6500. Can I use the analog pins on the 5v board to output 3.3v signal?
No, the "analog pins" are really 5V digital output pins, pulsed to give a lower average voltage. The damage will be done regardless. Use something like this level shifter, or a 3.3V Arduino.
Lol, I think I bought something similar by accident. They seem similar. Is this a level shifter?
Yes, certainly looks like it 
You need to level shift SDA, SCL and every AD0, that is a total of 8 signals.
Uff, but I have been using the SDA SCL VCC GND pins unshifted for hours (one module at once), I hope they're still working.
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