nodemcu doesnt response in at command mode

Question

I want to sent AT command into node mcu esp8266 module with arduino IDE through serial monitor. I connect the node mcu to arduino uno board in following sequence: RX to pin 2 of arduino TX to pin 3 of arduino Vin of node mcu to 3.3V of arduino GND to GND EN of node mcu to 3.3V of arduino I send at commands in serial monitor but dont get any response. I also checked different baud rates. what is the problem? what thing I'm doing wrong?

    #include <SoftwareSerial.h>
SoftwareSerial esp8266(2,3); //2 -->rx  ,3 -->tx

void setup() {
  Serial.begin(115200);
  esp8266.begin(115200);
}

void loop() {
  if (esp8266.available()>0)
  {
      char c = esp8266.read();
      Serial.write(c);
  }
  if (Serial.available()>0)
  {
    delay(1000);
    String cmd = "";
    while (Serial.available())
    {
      cmd += (char)Serial.read();
    }
    esp8266.println(cmd);
  }
}

Answer 1

Some points to note:

• VIN should connect to 5V (it goes through the on-board 5V -> 3.3V regulator). If you connect VIN to 3.3V you will be starving the device of power.
• The NodeMCU doesn't come with AT firmware installed. You will have to install it first before it will respond.
• If you have a NodeMCU why are you bothering with an Arduino? The NodeMCU can do everything (and more) that the Arduino can do (except it lacks IO).