Answered my own question. I connected the power supply and the usb and it works fine.
I am using a 5v, 1000mA power adapter. I am injecting into the other end of the strips. The white is amazingly bright for the scrolling text. When it illuminates all the LEDs in sequence it looses a lot of power and they become very yellow. For 192 LEDs what type of power supply is safe?
I stole your diagram to re-illustrate how I have it all connected.
Well you can calculate how much current there is for each LED
1000 mA / 192 = 5,2mA per LED if you only drive one color
again divided by 3 for RGB or 4 for all colors combined with white.
This is a low value. Any standard LED draws 15 to 20 mA. And if you have RGB and white each LED will easily draw 10 mA so this would mean
4 * 10 * 192 = 7680 mA
There should be a datasheet to your LED-strip. There you can lookup how much ma each LED is pulling for full brightness.
I tried looking up the specs from this number "SK6812"
Not sure if they all have the same current
some say 0,4W per LED some 0,3W per LED
at 5V this means
0,3W / 5V = 0,06A per RGBW-4xLED this means each color 0,060 A/ 4 = 0,015A = 15 mA
419215 = 11520 mA.
This is so much that you will need to feed in the current at each 50 cm.
If you try to supply a so high current from one end of the strips all connected in serial
the copper in the strip will get very hot!
And if you really want to have so many LEDs do yourself a favor and buy a high quality powersupply. The high-quality is the insurance that nothing catches fire and nobody will die from electric shock. once I bought such a 20$ chinese powersupply. After connecting the AC-wire and pluggin it into the socket the 16A fuse switched off immediately. Shortcut between the phase and protection-wire!! Never again!
To keep the price in a medium range look out for PC-powersupplies that are able to deliver 5V with 15A.
best regards Stefan
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