This is a basic reference implementation of an Arduino on a breadboard using an external power supply circuit. The power supply circuit is separated as a module so that it can be easily reused in different projects. The modules are connected using jumper wires and sockets (Dupont wires).
- Official Arduino description how to move from Arduino to an ATmega328 on a breadboard https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard
- Official Arduino description how to create a power supply circuit for the Arduino on a breadboard https://www.arduino.cc/en/Main/Standalone
- Detailed guide and explanations about power supplies and circuits for the Arduino https://www.open-electronics.org/the-power-of-arduino-this-unknown/