user59728: 1) what is the max draw I can draw from NodeMCU V3 logic and 5v pins?
2) Also, I heard i draw with it more than 500mA, the PC USB port stops working. Is that information actual? Because USB 3 port has 900mA and USB 2 had 500mA max

user48150: for ESP8266 (which your NodeMCU is based upon) , the maximum current is about 20mA sinking and 12mA sourcing per [single] pin. so the maximum current of all GPIOs together is a lot lower than the 500mA USB limits.
you have to use external drivers (transistors, MOSFETs) for that purpose.
Sink current: the current which is provided when you pull the pin LOW. e.g. when you provide GND for the cathode of an LED. (the Anode is connected to VCC).
Source current: the current which is provided when you pull the pin HIGH. e.g. when you provide VCC for the anode of an LED. (the cathode is connected to GND).
the difference is for different internal resistance for identical N-MOS/P-MOS, due to their structure. that's why many devices like 7segment drivers, or motor drivers supply GND for the Load (common anode drivers) instead of VCC.

59728: <p>1) what is the max draw I can draw from NodeMCU V3 logic and 5v pins?
2) Also, I heard i draw with it more than 500mA, the PC USB port stops working. Is that information actual? Because USB 3 port has 900mA and USB 2 had 500mA max</p>
 48150: <p>for ESP8266 (which your NodeMCU is based upon) , the maximum current is about 20mA sinking and 12mA sourcing per [single] pin. so the maximum current of all GPIOs together is a lot lower than the 500mA USB limits.</p>

<p>you have to use external drivers (transistors, MOSFETs) for that purpose.</p>

<p><strong>Sink current</strong>: the current which is provided when you pull the pin LOW. e.g. when you provide GND for the cathode of an LED. (the Anode is connected to VCC).</p>

<p><strong>Source current</strong>: the current which is provided when you pull the pin HIGH. e.g. when you provide VCC for the anode of an LED. (the cathode is connected to GND).</p>

<p><em>the difference is for different internal resistance for identical N-MOS/P-MOS, due to their structure. that's why many devices like 7segment drivers, or motor drivers supply GND for the Load (common anode drivers) instead of VCC.</em></p>
