WS2811 or WS2812 based LEDs / RGB pixels are cheap and easily available on the online stores. They run off 5 volts and can be addressed individually. Waterproof versions are also available. On Ebay/Aliexpress/Alibaba they are sold as a set of 25 leds / RGB pixels connected together. Multiple such strips/chains can be connected together… Continue reading WS2811, WS2812, NeoPixel RGB Pixels/LEDs and Arduino