Today I had the rare case that the "Brick", like the fans, the central Lego brick with the microprocessor in the Lego Mindstorms EV3 kit call, didn't make a sound anymore. He was still busy flashing his green LEDs, but he did not take orders anymore. Interestingly, the Bluetooth connection was still active, but it didn't respond to commands from the iPad or to pressing buttons on the brick itself.
Like all computers, the "Brick" - the central control unit of the Lego Mindstorms EV3 set - sometimes "tweaks". Here are a few problems and solutions.
The solution: a hardware reset of the EV3 brick
In the end, the only thing that helped me was a hardware reset, which is carried out directly on the EV3 brick. This "forces" him to restart. Where - as I have read - it is more of a start to update the firmware in the EV3 Brick. But it doesn't matter: it restarted me and then I was able to upload and start the program again via iPad. So my problems were solved!
Instructions: How to reset the EV3 Brick
The reset can be carried out relatively easily with three buttons:
- With two fingers you press the button in the middle and the button to the right of it.
- With the finger of the other hand you press the "Back" button at the top left and keep all buttons pressed until the lights and the display of the Lego EV3 brick go out.
- Now you let go of all buttons and the brick should restart.
If you want to see the whole thing illustrated again, you can look at these instructions for the "Start in the firmware update mode":
Instructions for a hardware reset of the Lego EV3 brick.
Problems that can occur with the "Brick"
As I have read, there are some problems you can have when switching on or operating the brick. In order to eliminate these sources of error, I have summarized the symptoms / errors and the possible solutions here:
- After changing the batteries / rechargeable batteries, the EV3 brick is "dead" and no longer reacts. If so, remove the batteries again and check that you did not bend any of the metal clips when you inserted the batteries.
- When the brick has started it will flash red and then go off. If this happens with the education version, it may be due to a defective battery pack. Lego delivered a defective battery pack in the early versions of the education version, but Lego will replace it.
- The brick reports "starting", but the boot process never finishes. In this case the firmware has to be reloaded, which can be done with the following steps:
- Remove and reinsert batteries; press and hold the middle button and the right button until the message "Updating..." appears; connect the EV3 Brick to the computer via USB; update the firmware by going into the lego App select the item "Firmware Update" in the menu.
- The EV3 brick is stuck in the firmware update and is not finished. This problem can also be solved with a manual update of the firmware via the computer. To do this, proceed as follows:
- Press and hold back button, middle button and right button (as in the picture above) until the brick restarts. Then you just let go of the button on the top left and wait until the brick reports "Updating ...". Now let go of the remaining buttons and press the download button in the firmware update tool (the brick has to be attached to the Mac / PC via USB the whole time). The brick now receives the new update and then restarts. If this does not work the first time, the procedure can be repeated several times until it works.
- The EV3 stone no longer works and won't turn off (that's what happened to me). A manual reset is carried out here. According to the instructions from Lego, the reset does not result in the loss of files and settings on the brick that originate from previous sessions. However, the data of the current session will be deleted. The manual (hardware) reset is carried out as described above (press and hold the top left, center and right buttons until the display and LEDs go out).
The current firmware and the program (Windows / Mac) for the firmware update can be found by the way here on the Lego download page .
(Source for some information: legoengineering.com)
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.