Powered Up Quick Start

_images/powereduphubs.png

This page shows how you can install Pybricks on your hub and run your first program. When you’re ready, browse through the Pybricks Modules in the left hand menu to modify the example program.

Note

  • This is still in beta! Not everything may work as expected yet.
  • We welcome your questions, feedback and bug reports on our support page.
  • For now, sensors/motors are detected automatically only once. So if you change the cables, you have to turn the hub off and on again. You can turn it off by holding down the button for about 5 seconds.

Installing Google Chrome

Writing Pybricks programs requires a web browser with web Bluetooth functionality. Currently, only Google Chrome supports this. Download Google Chrome from here.

Show/hide extra steps for Linux users

  • In Google Chrome go to chrome://flags/.
  • Search for Experimental Web Platform features and enable it.
  • Installing firmware will be slow if you have BlueZ < v5.51. Check your version: bluetoothd -v.

Installing the Pybricks firmware

Pybricks uses an improved firmware that can run autonomous programs. Installing it is easy:

  1. Make sure you use fresh batteries.
  2. Unplug all motors and sensors.
  3. Follow the steps in the video below.

Click to show/hide written step-by-step instructions.

  • Make sure you use fresh batteries.
  • Unplug all motors and sensors.
  • Make sure the hub is off.
  • Press and hold the green button.
  • Wait for the light to blink, but keep holding the button.
  • On the Pybricks Code page, click the firmware update button.
  • Select the LEGO Bootloader and click Pair.
  • The light should change to a red/green/blue sequence.
  • You can now release the button.
  • Wait for the update to finish, indicated by a blinking blue light.
  • If you use the recommended browser, this will take about 90 seconds.

Running programs

Once the firmware is installed, you can start coding! Use the Bluetooth button to search for and connect to your Pybricks Hub. Then press run to start your program.

_images/pybrickscode.png

To get started, just copy and paste this snippet:

from pybricks.pupdevices import Motor
from pybricks.parameters import Port, Stop
from pybricks.tools import wait

# We'll use two motors. One is a dial
# to set the speed of the other motor.
motor = Motor(Port.B)
dial = Motor(Port.A)

# Say hello :)
print("Hello, Pybricks!")

# First, we'll move the dial to zero.
dial.run_target(500, 0, Stop.COAST)

while True:
    # Set the speed based on dial angle
    speed = dial.angle()*3
    if abs(speed) < 100:
        speed = 0

    # Run motor at desired speed
    motor.run(speed)

    # Wait briefly, then repeat
    wait(10)

Show/hide beta steps to save a program permanently

Saving a program permanently (BETA)

Note

  • This functionality is in beta. It is currently only recommended for advanced users. In the long run, we’ll make this easy to do with the online editor.
  • All LEGO motors and sensors need a few seconds to boot. You don’t normally notice because you spend that time connecting. But this is way faster. So if you experience problems, give your hub a few seconds before you start your program.

When you run a program the normal way, it is deleted as soon as it’s done. That’s because Powered Up hubs don’t have a file system to store programs. Fortunately, you can still save a script on the hub by including it in the firmware.

Of course, this is a bit slow to do every time. We recommend the using the standard procedure most of the time. When you’re happy with your final program, you can save it permanently as described below. To change the program, just repeat these steps:

  1. Sign in to GitHub.
  2. Go to our GitHub commits.
  3. Click on the green checkmark next to the latest commit. On the dialog that pops up, click details.
  4. Then click Artifacts on the right hand side of the page.
  5. Download the firmware for your hub. The firmware is a ZIP archive containing the basic firmware and one main.py script.
  6. Modify the main.py file as you like.
  7. Drag your modified ZIP file onto the firmware update button of the online editor.
  8. The update now proceeds as usual.

Once installed, you can start that program with the green button. No connection required!

Restoring the LEGO Firmware

Pybricks uses the same update method as the LEGO apps; just with a different firmware file. This means you can go back to the original firmware any time. As shown in the video below, just put the hub in update mode and connect using a LEGO app.

This video shows the Powered Up app in create mode. It has firmware for all hubs. As usual, you may need to restart the app to detect the hub. If it fails, try again with fresh batteries.