He used four powerful soft-white LEDs, mounting them on a pair ... but instead he included is own controller. An Arduino drives the switch-mode power supply, offering dimming thanks to PWM ...

If you're developing a wrist watch, a small light-following robot, or a portable weather station with Arduino ... to connect ...

He connected the Arduino Mega’s LED output to a pair of LittleBits which then switch a servo between two positions. A bare servo wouldn’t be much fun, so [Outaspaceman] connected a tentacle ...