(full disclosure - I work for micro:bit) If you're looking specifically at Lego, then the sbrick-plus https://www.sbrick.com/ https://www.sbrick.com/ can talk

(full disclosure - I work for micro:bit) If you're looking specifically at Lego, then the sbrick-plus https://www.sbrick.com/ https://www.sbrick.com/ can talk directly to a BBC micro:bit https://github.com/vengit/pxt-sbrick https://github.com/vengit/pxt-sbrick so you can use the micro:bit and Lego together. There are also a huge range of micro:bit accessories from third parties that do robotics, sensing, lights, etc.