BBC

AI Overview
The BBC micro:bit uses a
Nordic Semiconductor system-on-chip (SoC) as its main CPU, with the original version (V1) using the nRF51822 (ARM Cortex-M0) and the newer V2 featuring a more powerful nRF52833 (ARM Cortex-M4) for faster processing and Bluetooth 5.0. Both versions also have a separate NXP interface chip handling communication and other tasks.
Key CPU Details by Version:

charles muchene
medium Charles muchene

rust-on-bbc-microbit

rust on bbc micro-bit
simple build steps
regex on rust
good example

bbc microbit features
micropython
The BBC micro:bit uses a proprietary short-range wireless interface based on the Nordic Gazell protocol, which is built upon the Nordic nRF51 software development kit, for its radio communication.

pinouts including SDA, SCL, UART
example read
BBC microbit breakout connector

Note: The micro:bit's processor is based on the Nordic nRF51.

edge connector tech details
see also

more info
dfrobot

YouTube - could be useful

dfrobot course

Rust is a curly-brace, block-structured expression language. It visually resembles the C language family, but differs significantly in syntactic and semantic details. Its design is oriented toward concerns of "programming in the large", that is, of creating and maintaining boundaries - both abstract and operational - that preserve large-system integrity, availability and concurrency.

Thu Dec 19 18:39:06 2019
Sometimes something is donated but on receipt, it appears not to work. In this example, it was a bedside radio. The manual may not be present and the item may be too old to find on the internet. So the dismantling process is started. The item may be composed of many sub-modules and some of them may be identifiable electronic sub-units such as keypads, rotary controls for volume, motors (DC or stepper) and so on.