Your Independent Project
You can use Arduino directly on several projects, but you can also create them independent of your Arduino board, that is, by creating a Standalone project, using only the ATmega micronator already written and tested with the required code, and a few components required for its operation.
We at the Digital Institute have tested and suggested this simple scheme of a standalone project, we have produced a simple graphic scheme so that you can better understand its operation.
Feel free to swap or remove components you find necessary. Watch out for voltage and voltages so as not to damage its components.