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Using charlieplexing you can control n*(n-1) leds with n lines. The downside is that you can only light one LED at a time.
Many people have this misconception, you can actually light n-1 LEDs at any one time. Take the Junebug, you can make each pin low and control two LEDs by making the other pins high or input. Check out MikeK8LH's clock for a very good example of a 7x8 matrix.
Mike.
No, because I do it and find it useful. Yes you have to ensure there is a separate resistor per LED.May I suggest that you can do it, but it is not very useful?
Does that make my input any less valid or something? The most charlieplexing I have done is 144 LEDs, with 20 appearing to be on at any one time. This is very doable and a huge advantage over a normal matrix.Wow, a 4 year old thread. Guess you didn't notice the text that warned how old this thread is.
Mike.
What's the advantage, please?Does that make my input any less valid or something? The most charlieplexing I have done is 144 LEDs, with 20 appearing to be on at any one time. This is very doable and a huge advantage over a normal matrix.
Sure, it's on my website at **broken link removed** and it uses dual red/green leds. It's a clock that has has various effects, such as twinkling and rotating patterns.I'd love to see your Charlieplexed 144 LED matrix project (John?). Did you publish it somewhere?