144leds/m for a small 40"...Won't it be too much leds?

propergol · 24. September 2016

Hello,
I am wondering if I didn't make a mistake buying 144 leds /m strip for a 40" TV
I haven't received the strip yet and only have the PI3 and also waitting for a 5V26A Meanwell PSU.

I am wondering if all those led (390 total :ninja: ) won't ending producing too much light.

I have also a doubt regarding the PI connections to the strip : can I realy plug the signal wire diretly to it or does it need what you call "level shifter"?

Thanks a lot for your help.

penfold42 · 24. September 2016

It may well be too bright.
I have 30/m on my 55"

If it is too bright you can either reduce the brightness or disable every 2nd (or maybe more) LEDs in the config.

You are right the doubt the direct Pi connection. By the spec sheets it shouldn't work but does indeed work for many people.

propergol · 24. September 2016

Thanks for your anwser.

An other question :bigsmile: : as I was uncertain of what circuit I would and with, I did bought an Arduino Uno, just in case....
I now know that APA102 doesn't need it but the question is : would the overall responsiveness/quality of my setup be better using PI+Arduino rather than only the PI alone?

penfold42 · 24. September 2016

Simpler is better usually!

An arduino does give you a bonus level converter and if you screw up some wiring you're more likely to kill the cheaper arduino rather than the Pi.

Right now I have 2 pis with home brew arduinos on them cos I have ws2812 led strips.

My most recent Pi uses my ws2812_spi led driver directly

144leds/m for a small 40"...Won't it be too much leds?

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