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mtongnz / ESP8266_ArtNetNode_v2

ESP8266 based WiFi ArtNet to DMX, RDM and LED Pixels
GNU General Public License v3.0
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Turn LEDs off on startup #141

Open OrmeAudio opened 2 years ago

OrmeAudio commented 2 years ago

Hi! Fantastic work!

Is it possible to turn all led's (ws2812b) off on startup ? Or not turn them on ?

At the moment all led's turn white, I would like to avoid the power surge.

My cpp is a bit rusty, but I'm happy to do a PR if you point me in the right direction.

Thanks!

ulri-me commented 1 year ago

Hi,

I have never worked with this lib and the WS2812b LEDs.

But have a look at this reddit discussion: https://www.reddit.com/r/arduino/comments/d5yjmt/ws2812b_default_color_after_power_on/

The question is if the library does anything itself to start the LEDs with full white.

As far as I can see the only DMX output buffer initialisation with a default value is this line https://github.com/mtongnz/ESP8266_ArtNetNode_v2/blob/4a1f803e6d3cd0946d18dc851ab2eeb200e828f4/libs/espDMX_RDM/espDMX_RDM.cpp#L384 which stores 0 as default value for a newly created DMX buffer.

And for the LED strip itself does this line https://github.com/mtongnz/ESP8266_ArtNetNode_v2/blob/4a1f803e6d3cd0946d18dc851ab2eeb200e828f4/source/startFunctions.ino#L113 execute this function https://github.com/mtongnz/ESP8266_ArtNetNode_v2/blob/4a1f803e6d3cd0946d18dc851ab2eeb200e828f4/source/ws2812Driver.cpp#L29 which also clears the buffer to 0's by calling this function https://github.com/mtongnz/ESP8266_ArtNetNode_v2/blob/4a1f803e6d3cd0946d18dc851ab2eeb200e828f4/source/ws2812Driver.cpp#L70

ulri-me commented 1 year ago

So I would assume you have to be faster with starting the output (or even start the output before powering up the LED strip) or get this capacitor trick from Reddit to work.