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 and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button.
The Arduino USB Host Shield allows you to connect a USB device to your Arduino board. The Arduino USB Host Shield is based on the MAX3421E, which is a USB peripheral/host controller containing the digital logic and analog circuitry necessary to implement a full-speed USB peripheral or a full-/low-speed host compliant to USB specification rev 2.0. The shield is TinkerKit compatible, which means you can quickly create projects by plugging TinkerKit modules onto the board.
This is the very first prototyping shield for Arduino in the market since 2010. It comes with prototyping area that you can sold led , switch or other components, it also comes with a mini Arduino breadboard that can stick on the prototyping shield that make the project look tidy and fancy.
These stackable 0.1" (2.54 mm) female headers are just the right height for connecting Arduino shields to Arduinos and other shields. The set includes two 1×6 female headers, two 1×8 female headers, and one 1×10 female header, so it has everything necessary for both old- and new-style shields
The Spider robot controllers were designed for robots requiring a large numbers of servos such as humanoid and hexapod style robots. Using an ATmega 2560 CPU this controller is fully compatible with the Arduino Mega (2560) and can controll up to 48 servos