It is good practice to connect only one component to each signal for example, if you have an Arduino shield that makes use of Arduino I/O pin 6, you should not also connect the green element of the tri-color LED on port 2. There are two important considerations to using Hummingbird exactly as an Arduino Leonardo: Integrated Motor/Servo Shield: The gear motors and servos are controlled by a secondary processor that is controlled by the main microcontroller via SPI. Using bottom side Arduino connectors The bottom side Arduino connector pinout is identical to that found on the and is compatible with all Leonardo-compatible shields. Make sure to read the Hummingbird Duo for more information about using the connectors with non-kit components.
You may also choose to interface non-kit parts to these connectors - for example, standard LEDs in the LED port, or non-kit motors/servos. Using top side Hummingbird connectors The top side Hummingbird connectors are specifically designed to interface with Hummingbird kit parts, and the Hummingbird Arduino library described in section 3 is designed with this assumption in mind. There are three ways to use Hummingbird as an Arduino you can use solely kit parts and connect them to the Hummingbird top side connectors, you can use solely Arduino shields and the bottom side connectors, or you can use both.
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