Arduino is an open-source physical computing platform designed to make experimenting with electronics more fun and intuitive. Arduino has its own unique, simplified programming language, a vast support network, and thousands of potential uses, making it the perfect platform for both beginner and advanced DIY enthusiasts.
The LED turned on for a second and then it turned off for a second then back on.
The LED turned on for four seconds and then it turned off for two seconds then back on.