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LEGO WeDo 2.0 Extension for Scratch 2

Introduction

LEGO WeDo 2.0 is a product range of the LEGO Education series for teaching basic engineering and programming to kids at the age of 7+. It communicates through Bluetooth Low Energy and can be programmed with Scratch 2, allowing robotic and non-robotic projects to be implemented in the same visual programming language. Unofficial support for Linux is available through the S2Bot helper app, but only works with the Bluegiga BLED112 Bluetooth Smart Dongle.

This project provides an open source Scratch 2 HTTP extension for LEGO WeDo 2.0 which should work with any Bluetooth LE capable chip supported by Linux.

Installation

For now this project doesn't provide Scratch 2 blocks. You can re-use the templates provided by S2Bot.

  1. Install prerequisites of pygattlib as listed in its DEPENDS file.

  2. Install prerequisites of the extension:

     pip install -r requirements.txt

  3. Download and extract S2Bot, only needed for Scratch 2 templates.

Usage

  1. Determine the MAC address of your LEGO WeDo 2.0 Hub:

     sudo hcitool lescan

  2. Start the Wedo 2.0 extension with the determined MAC address:

     ./scratch2-wedo2.py MAC_ADDRESS

    Depending on your permissions you might have to run it with sudo:

     sudo ./scratch2-wedo2.py MAC_ADDRESS

  3. Start Scratch 2.

  4. Open wedo2_template.sb2 from S2Bot.

  5. Save your project under a different name.

  6. The LEGO Wedo 2.0 blocks are now available under Other blocks.

Notes

At the moment the following WeDo 2.0 features are supported:

  • Smarthub button
  • Smarthub light
  • Medium motor
  • Tilt sensor in default tilt mode (any, up, down, left, right)
  • Motion sensor in default distance mode (distance 0 - 10)