If the need is a fabrication, it is better to go with Nano and if it is needed for developing projects and codes, Uno works better with the capability. Thus, it does all the work done by Uno with the storage and memory capacity but looks to adjust with less space in the system. If the project requires less storage and the space given is small, then it is better to go with Nano as the size of Nano is small and the specifications are more or less similar to Uno.A serial to TTL converter is needed to write programs in the Nano breadboard. The programs can be written in Uno by connecting it to the PC directly and making it work.When the program is up and running, the variables can be created and manipulated in Nano due to its SRAM space and Mega systems while it does not happen in Uno. Uno has 2kB SRAM space while Nano has 8kB SRAM space in the system and hence it can store more data than Uno. Static Random Access Memory is used in Arduino systems.Both Nano and Uno have a clock speed of 16MHz and the memory also remains the same.Nano has a flash memory of 32kB with a preinstalled bootloader while Uno is 32kB without a bootloader.Uno uses a regular USB port while Nano uses a Mini USB port. Among the digital pins, 6 have PWM in Nano and Uno. Uno has the same 14 digital pins and only 6 analog pins. There are 14 digital pins used and 8 analog pins used in the system.
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