IPA: /ˈmaɪ.kroʊ.kənˌtroʊ.lər/
KK: /maɪkroʊkənˈtroʊlər/
A small computer on a single chip that manages the functions of an electronic device or system, like a toy or a car engine.
The engineer programmed the microcontroller to operate the robotic arm.
Microcontroller → It is formed from "micro-" (from Greek "mikros", meaning small) and "controller" (from Latin "controllare", meaning to check or regulate). The word "microcontroller" refers to a small device that regulates or controls other devices.
Think of something that is 'small' ('micro-') and acts as a 'regulator' ('controller') — that's why a microcontroller is a small device that controls other devices.