Installing the EXP6 library: SPIKE Prime (LEGO Education SPIKE App 3)

For teachers, students and first-time users: follow these steps in order to control the EXP6 with Python in the LEGO Education SPIKE App 3. You install the library only once; every Python project can then use it. Install it again after a hub firmware update.

Using LEGO MINDSTORMS Robot Inventor (51515)? See the Robot Inventor install guide.

What you need

  • A SPIKE Prime hub (battery charged)
  • A computer or tablet with the LEGO Education SPIKE App 3
  • USB cable or Bluetooth, either works
  • EXP6 firmware dated 2026-11-03 or later
  • MBC_EXP6_Official_App_Lib.zip from this site, unzipped

Install steps

  1. Turn the hub on and connect it in the SPIKE App by USB or Bluetooth.
  2. Make a new project and choose Python.
  3. Open the unzipped SPIKE_Education\Install_MBC_exp6_Lib.py in a text editor, select all, copy, and paste it into the App's Python editor (delete what was there).
  4. Press Run (▶) and open the console at the bottom of the App. When it says "安裝成功！(Installation Successful!)", you are done. You can delete this install project; the library stays on the hub.

Tip

Prefer not to copy and paste? Download install_exp6_lib.llsp3 and double-click it on your computer: it opens straight in the SPIKE App (or use File → Open in the App). Press ▶ once. It contains the same program as Install_MBC_exp6_Lib.py.

Start programming

  1. Connect the EXP6 battery and plug the EXP6 Host cable into a hub port (for example port F).
  2. Make a new Python project and start it like this:
from hub import port
import time
from MBC_exp6_SPIKE_App_Lib import MBC_EXP6

exp = MBC_EXP6(port.F)          # EXP6 on hub port F
exp.motor_run(1, 50)            # motor on EXP6 port 1 at 50% speed
time.sleep(2)
exp.stop_all(1)                 # stop all motors at the end (on Education they do not stop by themselves)
  1. Press Run. You can also open the 10 examples in the examples folder of the download pack (EXP6 in port F).

Note

The App's editor puts a red underline under MBC_exp6_SPIKE_App_Lib. Ignore it: the App's syntax check does not know about libraries installed on the hub, and the program still runs.

Try each function in your browser first: LEGO SPIKE App interactive tutorial; everything is explained in the official App guide.

Remove

To remove it: make a new Python project, paste SPIKE_Education\Uninstall_MBC_exp6_Lib.py from the download pack and run it until you see "Uninstall Successful!".

Troubleshooting

What you see What to do
ImportError: no module named … Not installed, or a firmware update wiped it → install again
"讀不到擴充板資料" (cannot read the expander) Check the EXP6 battery, and that the port in MBC_EXP6(port.X) is the one it is plugged into
The motors keep running after the program ends Education has no watchdog → end your program with exp.stop_all(1)
The official App cannot connect to EXP6 EXP6 has run a Pybricks program or been on a Robot Inventor hub → take the EXP6 battery out and put it back
MemoryError The program is too big → split it, restart the hub and try again

Still stuck? Contact us with a screenshot of the console messages.

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