Hi ! Recently I talked about the STM32 Platform, it is becoming mainstream, there is now a nice introduction video made by the GreatScott to the cheap 2$ STM32 Nano style board using the Arduino IDE.
It shows some basic usages, compare with existing Arduino capabilities (PWM speed, ADC, ...), short and to the point.
Just enjoy !
Check out his youtube channel, he is doing great stuff: https://www.youtube.com/channel/UC6mIxFTvXkWQVEHPsEdflzQ
My previous post on the STM32 Nucleo Platform if you want much more IOs/Memory/CPU : https://steemit.com/diy/@boucaron/stm32-nucleo-rocks