Just follow the schematic diagram to complete the construction, and use any standard 9VDC Arduino power source to energize the system. Here, for demonstration, three different color LEDs (Red, Green ...

[Blue Blade Fish] wanted to build an Arduino-based aquarium controller. He’s detailed the system in (so far) 14 videos and it looks solid. This isn’t just a simple controller, either.

But this Arduino device can be programmed to control a whole host of devices: As long as it has an infrared interface, chances are you can get this to work–whether it be a TV, DVD player, VCR ...