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• The Arduino Pro Mini328-3.3 V/8 MHz is a minimalist Arduino board with an 8 MHz boot loader. The operating voltage of the microcomputer is 3.3 V, which is different from the standard 5 V. It has a regulator and a clock oscillator, and the minimum operation of a microcomputer is possible, but it omits the USB interface that full-spec Arduino such as Uno has as a standard, and it has an external FTDI interface board. Auto reset is supported only when the DTR connector of the external interface is enabled. The power supply voltage of the microcomputer is 3.3 V, so the voltage of the interface is also limited. According to the manufacturer's comments, users should get started with Uno R3 and use the Arduino Pro after familiarizing themselves with the specifications. (Does the name "Pro" mean "no beginners" ...)