From Arduino to a miniaturized circuit I have a project made with Arduino, and I want to replace it by a miniaturized circuit with just a microcontroller. Is there any tutorial that can guide me in doing this? Any reference is wellcome. Thank you!
You can use an Arduino on a breadboard to get you going. From the breadboard, you can then develop a circuit on a pre-made PCB like this:



Then to a custom PCB, if you so desire.