NodeEcu V3 board power supply: connecting sensors and LED to 3.3V, VU-5V, VIN 5V outputs

Question

I need a quick answer. I have a NodeEcu V3 board. On the board there are 3 outputs 3,3V, VU-5V, and VIN 5V. So I can for example 4 sensors to one board and under VIN for example an LED.
I mean just the power supply without programming.
Because I am afraid that if I connect everything then the voltages on the pins will drop.
If I am wrong somewhere in the description, please correct me. Board connected via USB.

khoam · Accepted Answer

In older NodeMCU models this was indeed the case, i.e. the VIN was directly connected to the VUSB. . What is the total consumption of all 4 sensor modules?

khoam · Accepted Answer

All pins marked 3V3 on the NodeMCU board are connected to the output of the stabiliser on this board. The current capacity of this stabiliser (AMS1117) will not exceed more than 500 mA, mainly due to the poor heat dissipation on this board (the theoretical maximum capacity of this stabiliser is 1 A).
The NodeMCU for its needs draws about 200 mA.
The two displays together consume a little over 150 mA.
The Power LED is a consumption of about 700 mA (here only the power supply from the VUSB comes into play, if the current capacity of the USB port allows it).
The current consumption of the DHT is negligible.

In my opinion, it is best to power everything from the VUSB.

khoam · Answer

The VIN is an input for power, not an output. It is used to power the board when USB power is not being used.

szaryczlowiek831 · Answer

. And you see I found quite a different opinion just here on the electrode. That when powering the board from USB there is a voltage of 5V on the VIN pin. Unfortunately I will organoleptically check only when I return.

szaryczlowiek831 · Answer

I just googled and read that the win output on the V3 version is input only. I just wanted to bow and admit I was right. The MSP2401 display is to be connected to the board to this DHT 11 or DHT 22, DFR0645, and GW PLLRA1.PM-N4N6-XX52-1-700-R18.
Assumption DFR0645 gives time and temperature from sensor interchangeably every ~30 sec backlighting during daytime hours at nighttime hours backlighting minimum. Dht sensor read every 30min led wired to switch. Led backlighting similar to display.
Bistable switch on diode supply.
I have not yet decided on the diode itself. In theory both displays should run on 3v as should the sensor.

szaryczlowiek831 · Answer

Thanks for the reply. I'll connect everything to the board and run some cables and see if anything heats up. Of course, the diode will be connected under the VU other way. USB should be fine, but before I put it in the box I'll check if it heats up.

Added after 3 [minutes]: .

I have received a suitable hint on how to solve my problem. What will come of it will show time.

szaryczlowiek831 · Answer

Thanks for the reply. I'll connect everything to the board and run some cables and see if anything heats up. Of course, the diode will be connected under the VU other way. USB should be fine, but before I put it in the box I'll check if it heats up.

Added after 3 [minutes]: .

I have received a suitable hint on how to solve my problem. What will come of it will show time.

[Solved] NodeEcu V3 board power supply: connecting sensors and LED to 3.3V, VU-5V, VIN 5V outputs

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