Arduino Leonardo The Arduino Leonardo is one of the most popular versions of the series, behind only the legendary Uno plate to which it has very similar features (see our comparison below). The board contains a microcontroller ATmega32u4 with the participation of 20 digital inputs/outputs, of which 7 can be used as PWM outputs and 6 analog inputs. The system works with the clock signal with the frequency of 16 MHz, has 32K Flash and 2.5 KB of SRAM RAM. Code BAR57 ✗ Out-of-Stock Price €22.13