Hi. I’m not sure what unit I need Maybe someone could help me? Basically I want to make a LED marine chart with the bouyage to light up with their correct characteristics. As in 6 short flashes and 1 long or
To get the different colours you will need RGB LEDs.
To make the programming easier I would get LEDs that your can string together and control with one Arduino pin (look up neopixel).
The Multiblink software in my code repository (link below) could be a good start for you in terms of thing=king about how to manage lots of LEDs, but that version is written for single colour LED each connected to a single pin.