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UC Davis Center for Integrated Computing and STEM Education (C-STEM) --- Research and Outreach
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Lego Mindstorms NXT/EV3

Q: My program cannot connect to NXT or EV3. What should I do?
A: Make sure the firmware is updated when prompted. Make sure the robot is set to  bluetooth connection, instead of iPhone connection, based on the instructions.

Q: I am able connect to EV3, but it is not responding.
A: Make sure the iPhone/iPad/iPod option is unchecked for Bluetooth configuration of the EV3 and NXT under the setting menu.

Q: I am using a NXT with a lot different computers. Now I am not able to pair the NXT with a computer.
A: One possible reason is the contract on the NXT is full. One NXT can be paired with a limited number of computers stored in its contracts. Follow steps below to delete some contracts that no longer need.

  • Navigate to “Bluetooth” using the “>” button on the NXT brick.
  • Push the orange button twice to go into Bluetooth->My Contracts.
  • Push the orange button to select each entry in the contracts.
  • Use “<” button to select the “trash can” icon for deleting the entry.
  • Delete as many entries as you want and try the NXT again.

Note: you will need to remove the NXT from the computer side as well as described below. Otherwise, it may not work with the computers that were on the contracts before.

Q: How do I remove a NXT/EV3 from a Windows Machine?

  • Press Windows key + X.
  • Click on “Device Manager” from the popup window.
  • Click on “Hidden Devices” from the “View” menu of the “Device Manager” window.
  • Double click the Bluetooth icon from the “Device Manager” window.
  • Find your NXT/EV3 under the Bluetooth icon
  • Right click on the entry and click uninstall.

Q: How do I remove a NXT/EV3 from a MacMachine?

  • Hold down the option key on your Mac’s keyboard.
  • Click on the Bluetooth menu. Notice that the Bluetooth menu looks different. It provides more detailed information about Bluetooth firmware, address, and provides an option to export a report to your desktop.
  • Select the device you wish to remove from the Bluetooth menu and a popup menu will appear.
  • Click Remove and the Mac will ask you if you’re sure you want to remove the device.
  • Click the Remove button to confirm.