Should I Buy Common anode RGB led or common cathode, I feel like commons cathode is easier but I’m not sure
The two circuit variations are identical in outcome. If one seems easier to implement, go with it.
oh ty
I mean, either one should work.
Hi @vairaj
What's the question in the title related to?
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Tell us more what the RGB LED will be used for.
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I prefer common anode if I had to choose.
See D9 and D10 in this schematic.
- Common anode RGB LEDs can be easily controlled by a LOW level at the collector of an NPN BJT or the drain of an N channel MOSFET.
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If you are buying one common anode RGB LED or one common cathode, it may be no different.
If you are buying, say, 30 common anode RGB LED or 30 common cathode, to use in the same circuit, there will be differences in difficulty of controlling them. You are correct to say that common cathode are usually (but not always) easier to work with.
Also there is a much, much easier way than common cathode/anode: ws2812 or similar "addressable" LEDs. These require only a single Arduino pin and no driver circuits (transistors etc) because they have driver circuits are built-in. Yes, they are a little more expensive, but when you factor in the extra components and your time to understand and build the driver circuits for common cathode/anode LEDs, the ws2812 are worth it.
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What's the application?
I would prefer common anode.
That stays in line with analogue LED strips.
Easier to drive with more common NPN or N-channel fets if you need to drive a bunch of them. Also easier to power from a different supply.
Leo..