LED Module – GREEN – Crowtail Conn
This LED Module is the best way to step into the Arduino world from it’s I/O pins. The LED is the best choice to help you learn I/O pins. What you need to do is connect the LED module to the Base Shield D ports and download the very basic program to the Arduino, then you can light the LEDs.
Besides the very basic usage, you can make the LED blink with the frequency you want, thus the brightness with PWM.