Nodemcu question

Projects General Guidance
1

I am very new to nodemcu board I want to know :

  • EN pin should keep float without using pullup resistor then if need a resistor what is the value
  • another point what is pullup resistor value should be connected to RST pin?
2

While waitng for precise reply, use 10k.

3

EN must connected to pullup resistor 10K
RST must connected to pullup resistor 10K
is it correct?
note: ESP8266 board is located near to 220V AC Contactor then as you know contactor can generate electric spark when turn on & turn off
is there any recommendation?

4

looking at NodeMCU schematics many have 12K pullups on GPIO0, GPIO2, EN and RST
240V contactors, motors, etc can be a problem around microcontrollers causing data corruption, processor resets, etc
use good power supplies and grounds, metal enclosures, shielded cables, etc

5

No, a NodeMCU already has all the required parts included.
You only should be asking these questions if you would use a bare ESP8266 module.

Supply and wiring matters, but a metal enclosure is not an option for a WiFi module.
Leo..

6

ESP.wdtEnable(5000);

this command what means?

7

I have a question please relating using MDNS

 if (MDNS.begin("esp8266", WiFi.localIP())) {

    Serial2.println("MDNS Responder Started");
  }

is it same as

MDNS.begin;

also I want to know what is the difference between

MDNS.update();
MDNS.loop();
8

MDNS.begin; is the same, only without the serial prints.

All I know is that MDNS doesn't work if MDNS.update() is not in void loop().
Don't know what MDNS.loop() is.
Leo..

9

so no need

if (MDNS.begin("esp8266", WiFi.localIP())) {

    Serial2.println("MDNS Responder Started");
  }

just put

MDNS.begin("esp8266");

10

Been a while since I used mDNS, but the brackets AFAIK just hold the friendly name.
Connect with esp8266.local, or whatever name you have in there.
Leo..

11

which command is correct?

MDNS.begin("esp8266", WiFi.localIP());
or
MDNS.begin("esp8266");

12

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.