Advices for quadcopter accelerometer and gyro


#1

Hello,

I have found the article bellow:

Unfortunately I did not understood everything very well. I already have bought a MPC-6500 and indeed there is a possibility to have the gyro fs 32khz, but there is the possibility to lower the fs to 8khz and a bandwith of 250Hz. So my question is: why is this more sensitive to vibration than MPU-6000 if the MPU-6500 has a fs set same as MPU-6000? (maybe I understood something wrong in datasheet)

Another question is related to the I2C readings. In my case I have a 400k baudrate for reading the sensor on I2C. I need to read 12 bytes from all axes with I2C at 400k, and this can be done for all values before the sensor updating the registers at 8khz(so I will have no junk in my readings). I am new in this and I don’t know if I understood correctly or if there are some minimum values to be applied.

At this moment the signal from accelerometer has a lot of noise, the angle variation is 10 degress when all motors are turned on. Again I don’t have a comparison for this… I will try to reduce this by mounting some silicone at the joints.

Any advice is really appreciated.

Thank you,
Andrei


#2

For drones, we don’t use mpu6500 because it is too sensitive to vibrations. I don’t know the exact reason for this, other than comparison data between the two. But I imagine it is a function of the resonant frequency and sensitivity of the MEMS sensor and also the update rate.

So if you are using an mpu6500 I highly suggest you change it, as it will save alot of headaches down the road if you are using this on a drone.