Bookmarked Data logging with the BBC micro:bit (microbit.org)

You can use the BBC micro:bit V2 with built-in speaker as a data logger, recording data from its built-in sensors. Data is stored on your micro:bit even when its power source is disconnected.

This looks really interesting. H.T. to @LouiseE_Foreman. The way the data is saved and accessible is very clever.

You can log data from any of the micro:bit inputs; light sensor, temperature sensor, pins, accelerometer, compass, microphone