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STM32duino I. - How to start with STM32 like Arduino

Arduino is very popular platform with support from huge community.
You can buy a lot of Arduino (compatible) boards - original Arduino, clone of Arduino with the same microcontroller (ATmega328, SAMD21) or different microcontroller (ESP32, ESP8266).
Arduino board with STM32 microcontroller belongs to the Arduino compatible boards with different microcontrollers.
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