Nano

The Arduino Nano closely resembles the Arduino UNO, as they both utilize the same processor, the Atmega328p, enabling them to execute the same programs interchangeably. However, a significant distinction lies in their size, with the UNO being twice as large as the Nano, thus occupying more space within your project. Additionally, the Nano offers enhanced breadboard compatibility compared to the UNO, making it easier to integrate into prototyping setups.