The Arduino Leonardo USB board is developed on the basis of AVR ATmega32U4 micro-controller running at 5V/16MHz. The Atmega is pre-programmed with the Arduino boot-loader that allows to upload code to it via USB using the open-source Arduino development environment.
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2.54mm Female Header Strip - Single Row/Straight/Pin: 4~40/Pin Length: 11mm Description: This straight stackable 0.1 inch (2.54mm) female header with
2.54mm Female Snap Header - Single Row/Pin: 4~40/ EXTRA LONG PIN: 11mm
Arduino Leonardo
The Arduino Leonardo is a microcontroller board based on the ATmega32U4. It has 23 digital input/output pins (of which 7 can be used as PWM outputs
Arduino Leonardo