Microcontroller

As of 2020's, it is basically a cheap/slow/simple CPU used in embedded system applications.

MicroPython

It is interpreted. It actually implements a Python (-like ?) interpreter that can run on a microcontroller. See e.g.: Compile MicroPython code for Micro Bit locally.

As a result, it is both very convenient, as it does not require a C toolchain to build for, but also very slow and produces larger images.

Toggle pin 0 twice per second. This could be used for example to blink LED on pin 0 once per second with this test circuit:

BOARD__1gp0____3gnd
       |       |
       R_2k    |
       |       |
       +-aLEDc-+

Tested on:

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