Review on Arduino Pro Mini 328 3 3V by Joshua Nation

If you need a ready-to-use embedded processor for prototyping, it's hard to beat in the small, cheap, and easy-to-use categories. categories. You can use the simple Arduino development environment to get something up and running in minutes. Of course you can design something smaller (QFN package etc) but it will be a custom design and will cost more if the quantity is small. 3.3V and 5V versions are available (note the 8MHz vs 16MHz clock speed difference) to meet your performance and I/O level needs. (In fact, the 5V/16MHz version still works well with input voltages down to about 3V if you bypass the built-in regulator.)