My boys team experienced the same issue with the gyro sensor. In researching the issue, it is very common and relates to “drifting”. The online helps indicates the following:
• When connecting the Gyro Sensor to your EV3 Brick, you must hold it completely still in order to minimize “drifting”
• The Angle may “drift” over time and become less accurate. For best results, reset the angle using the Reset mode of the Gyro Sensor block before every motion that you want to measure the angle of.
In the forums, people also related it to motor speed. I would recommend trying the reset. If that does not work, have the team compare different motor speeds.
My team took the easy method, they experiment to determine what the sensor value needed to be for the robot to turn 90 degrees. In their case, they did a loop that exited at 70 degrees, yielding a 90 degree robot turn. They have not tested enough to know if this is consistent.
To upgrade, go the Lego Education download link that was provides when you purchased the EV3. The upgrade download is there.
Scott Rakestraw
Coach for Code Crackers and Capital Girls
www.fllstartingpoint.com
From: First Lego League in Virginia and DC [mailto:[log in to unmask]] On Behalf Of FLL Mind Storm Guardian's
Sent: Sunday, October 6, 2013 8:39 PM
To: [log in to unmask]
Subject: [VADCFLL-L] eV3 Firmware Upgrade
It is possible that the answer to my question is among the tremendous amount of data share in the spirit of collaboration among teams. My team is in the process of programming the missions and the kids are having major difficulty using the gyro to make turns. Turns expected to be 90 degrees stop at degrees approximately. Any hints?
In addition, I am having no success at all getting the firmware upgraded. When the brick connects quickly informs me to upgrade and provide directions and when I follow the link it takes me to YAHOO.
Carlos E
Coach FLL Team 8501
AKA - Mind Storm Guardians
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