Why you should buy an Arduino Leonardo

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The Arduino Leonardo is a microcontroller board based on the ATmega32u4 data sheet. It has 20 digital input/output pins 7 of which can be used as PWM outputs and 12 as analogueue inputs a 16 MHz crystal oscillator a micro USB connection a power supply socket an ICSP header and a reset button. It contains everything was necessary to support the microcontroller; simply connect it to a computer with a USB cable or operate it with an AC/DC adapter or a battery to get started.

Arduino Leonardo (with Headers)

The Arduino Leonardo is a microcontroller board based on the ATmega32u4 data sheet. It has 20 digital input/output pins 7 of which can be used as PWM outputs and 12 as analogueue inputs a 16 MHz crystal oscillator a micro USB connection a power supply socket an ICSP header and a reset button. It contains everything was necessary to support the microcontroller; simply connect it to a computer with a USB cable or operate it with an AC/DC adapter or a battery to get started.

Arduino Leonardo (with Headers)

Solu Leonardo with Headers for Arduino + Free USB Cable

Note: This product is discontinued, but you can purchase the Seeeduino Lite, which is an equivalent alternative that can be used instead.

Arduino Leonardo ATmega32u4 without headers

DIY Arduino Leonardo clone – Dangerous Prototypes

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Arduino Leonardo: Specifications,Documentation and FAQs