This Hardware Development Kit (HDK) for Arduino Leonardo is the easiest way to get started designing an Arduino Leonardo project.
The guidelines give you the drawings of common circuits like power (voltage regulator), Oscillator and Reset, etc., which will greatly shorten the designing process.
This kit also includes commonly used components like Atmel 32u4, 16M crystal, resistor, switch, etc. And the quantity is sufficient for at least 2 prototypes, which can get you out of the headache of purchasing small quantity components.
The parts are all in DIP which can be assembled by hand without much difficulty.
Highlighted Features
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Most commonly-used components
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Available for individual purchase
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Includes DIP Atmega32u4 with Arduino Uno Bootloader
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IC Pinout configuration diagram
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Modular circuits breakdown, e.g. Power, Microcontroller, Reset