I'm planning to run one of these 8x8 CJMCU-64 RGB Matrix through arduino nano (usb).
I tested it current draw powered via 5V-5A power supply, and through Arduino (usb). All leds White.
Current draw, at % brightness level, in software that I'm using to send data to it:
At 100% brightness lvl 1.25A (PSU) - 0.65A (usb).
At 50% brightness lvl 0.92A (PSU) - 0.53A (usb).
At 40% brightness lvl 0.82A (PSU) - 0.49A (usb).
At 20% brightness lvl 0.5A (PSU) - 0.37A (usb).
My question is, what % should I aim for powering it out of USB (not to overwhelm Arduino voltage regulator) for save long term use.
20%- It wants to draw 0.5A at that lvl powered via PSU
40%-50%- It draws 0.5A at that lvl powered via USB.
Thanks for your help good people.