Prop shield Heading Drift

[Tom Eilers]

The LEGO EV3 Gyro sensor is a ISZ-655. See LEGO MINDSTORMS EV3 Hardware Developer Kit.

The ISZ-655.

The ISZ-655 gyro has two Z-outputs (Z-OUT and Z4.5OUT), with scale factors and full-scale sensitivities that
vary by a factor of 4.5, as detailed in Section 8.2.7.
Having two sensitivities and two full-scale ranges for the one axis allows the end user to have one output that
can be used for faster motions (over a full scale range of ±2000º/sec), and a second output that can be used
for slower motions (over a full scale range of ±440º/sec). Thus a lower-resolution analog-to-digital converter
(ADC) may be used to digitize the motion, with the gain of 4.5 in the Z4.5OUT output effectively giving the
user additional two-plus bits of resolution.

 

[mjs513]

I am curious what amount of gyro drift is considered OK. Recently I was playing around with the Lego Mindstorms Gyro Sensor, which connects to their EV3 controller. I don't know what gyro chip they use, but it is rumored to be similar to the Invensense IXZ-2021. I do know something about how it behaves: Lego doesn't give any real specs for it, but in my testing I found it can detect rotation rates down to about 0.18 degrees per second (that is only 2x faster than the minute hand on a clock rotates!) although it is not too accurate below 1 degree per second, which is still a very slow turn (6 minutes per complete rotation).

Don't think I can give you a definitive answer to that question. think its going to be application dependent. But if you are interested in gyro drift:
https://www.analog.com/media/en/tec...al-articles/GyroCalibration_EDN_EU_7_2010.pdf
https://www.researchgate.net/public...or_MEMS_Gyroscope_Used_in_Inertial_Navigation

https://stemrobotics.cs.pdx.edu/sites/default/files/Gyro.pdf ** this one is on the lego sensor