VEX IMU Many Degrees Off

[weilin]

The IMU may need to be re-calibrated. This is the procedure to do a full factory alignment of the inertial sensor:

Full alignment procedure for Inertial sensor

This procedure calibrates the accelerometers in the Inertial sensor and saves the result in non volatile memory. This procedure needs vexos 1.0.10 or later. Only perform this calibration if your VEX inertial sensor is showing angles for roll and/or pitch that are larger than perhaps 1 or 2 degrees when the inertial sensor is on a flat surface that is known to be level in both axis. Some inertial sensors can show significant error for roll and pitch when placed on a level surface. To check a…

Also, please, take a look at these posts about debugging IMU/Gyro sensor:

Inertial Sensor Calibration

can you run this program, let the IMU finished calibration, then touch the screen and send me the data from the terminal (it just dumps all the numbers, I’m interested to see what they are) v5code-project-imuDebug.zip (10.6 KB) (change port number for IMU to yours)

Robot Doesn't Fully Turn in Autonomous

I ran the code you sent me yesterday on a “Frankenrobot” (ie. all the non drive motors were just sitting on top and not doing anything). The code runs correctly, the robot was doing the turns as you had programmed them, so it’s hard to tell what may be wrong with yours, but here are a few suggestions to check. make sure everything is plugged into the correct ports. make sure you are not moving the robot right after you run the program, the gyro will be calibrating during the 2 seconds after y…

Inertial Sensor Drifting and Not Stopping

This seems like a lot. Either the IMU is moving while being calibrated, or it has some internal fault. Check the IMU using the dashboard. Open the dashboard, there’s no need to run your program. Make sure the robot/imu is stationary and gently touch the calibrate button in the dashboard. After a couple of seconds, the imu will finish calibration and the roll, pitch and heading values will adjust to show the absolute orientation of the imu. Check the heading value remains stable with only …