Anyone know how much current can be pulled on the 3.3v output pin of either the Amico nodemcu v2 board or the lolin v3 board?
I am attaching a string of ws2812b LEDs to this board. So far I have 12 and it does not seem to be problem when being powered by the usb port. I am thinking that a string of 30 or so LEDs will produce enough light but I can’t find any details on how much current can be drawn from the board.
The board has an AMS1117-3.3 linear voltage regulator on board that is rated for 1A. The ESP itself can peak up to something around 250mA, so you should be able to draw 750mA from the pin while still leaving enough juice for the ESP itself to run. I’d probably keep it to 500mA, though, just in case.
A direct I/O source? 4mA probably 
as Nita said if your talking about direct off the regulator… but if your driving something high +3.3 off the I/O its 0.004A…
@Richard_Sloan He did say “on the 3.3V output pin” – There is a pin on the Nodemcu that is directly tied to the output of the voltage regulator and he is talking about that one, not the GPIO-pins.
Sweet. Each of the LEDs draw a max of 20mA which is only when they are at full brightness and set for white light. My guess is that my average draw per LED will be around 10mA so I should be good for a string of 50. I think I’ll just get a 1M string off of AliExpress that has 60 LEDs per 1M and call it a day.
Thanks everyone.
20ma per led RGB 3 leds 60ma
In theory I find on average the draw a little less, but expect at least 1A from 30-40 of them, if they are all full white