Intertial sensor values not calibrating to 0

VEX V5 Technical Support
1

Hi,
so when I hit the calibrate but on the inertial sensor not all of the accelerometer values reset to 0. the Y accelerometer value is at -.1 when I calibrate (z and x are good) and this makes the roll jump to 6 degrees at the beginning and the heading value changes (when the robot isn’t moving). When ever I move the robot and it comes to a stop the Y accel value is at -.1 ish. I keep calibrating and I get the same results. My sensor is mounted on my bot sideways. Also the gyro values all reset to 0.

2

Have you tried using the command

waitUntil(!Inertial.isCalibrating());

this will make it wait until the Gyro is doe calibrating.

3

The normal calibration procedure does not change anything related to the accelerometers, it’s a calibration for gyro offset only. Some customers have reported that they received sensors that show a larger error in the accelerometer readings when the sensor is level than we would consider acceptable. To address this, we have implemented a more comprehensive calibration that needs to be performed with the sensor under more controlled conditions, however, we haven’t released any details in how to do this as yet. I will try and get some documentation together next week and release here on the forum. vexos 1.0.10 is needed for this new factory calibration procedure.

3 Likes
4

Hey,

Any updates on that documentation?

5

Sorry, have not had time. I will get it done in the next few days, it’s not complicated but I want to make sure the procedure is clear.

5 Likes
6

see this.

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7

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