I am working on a project with lots of LEDs, likely 100+, that need to be sort of individually controlled… The good thing is though that it’s very abstract so there can be lots of patterns. They will be arranged like streams coming out from a central point, and I just need to display little comet sort of patterns on them, shooting from the center. Each steam can be identical, and every 32 or so LEDs in each steam can repeat so ultimately I only need about 32(this number is not particularly important) differently controlled channels. To make things way easier I can just put each pattern in parallel with the others.
BUT! there will be different colored LEDs and they cannot be arranged in that same pattern, they will start with one color, then in the middle be another, then at the end be a third… Likely with some diffusion between the three, but still only the three separate colors.
So basically I just need to know everything that I need to known about putting different colored LEDs in series. I know that each color needs its own resistor so that’s at least 3x32 resistors. I was hoping that I could get resistors with enough wattage rating to power all of each color in each position alone, but I realize that it would probably end up being easier to use multiple resistors for each color for each position.
Also any additional help on switching this much power and PWM would also be helpful. I don’t think I need to bother with multiplexing with such few individual channels, but I’m not sure if I should use one transistor per position or spread the current between a few, or between the different colors or what. I just want to know how it ought to be done. Also what sort of IC could I use to get PWM and 32 channels. I know there’s one that’s meant for LED’s but since I’m going to be using transistors anyway I don’t want to spend extra on it.
I’ve attached an image a very basic idea of what I’m going for. However it wont be quite as simple. It wont just be one pattern per color, there will be many more streams and sets of patterns, and when the colors change, there will be a few intermittent back and forth for diffusion.