Right, let's get straight to the point. This is a little eye-candy circuit which continuously cycles an RGB LED through the colours of the rainbow. The speed at which the colours change is adjustable.

Amazon is offering a four pack of Sylvania WiFi RGB LED smart light bulbs for only $14.18. That's 59% off the original $35 MSRP. At only $3.55 per bulb, that's currently the best per-unit price for ...