ESP8266 Community Forum

Could anyone suggest How to communicate between node MCU and Arduino by using serial communication for send some char or int

Could you please provide some more details.

This is not tested yet. I just start to play with my nodemcu.

If you code nodemcu using the Arduino IDE you may use

... fragment Arduino Board
// Arduino Code
#include <SoftwareSerial.h>
SoftwareSerial mySerial(7, 8); // RX, TX on nodemcu
... fragment Arduino Board

... fragment nodemcu Board
// nodemcu Code
#include <SoftwareSerial.h>
SoftwareSerial mySerial(8, 7); // RX, TX on Arduino
... fragment nodemcu Board

Connect 7 to 8 and 8 to 7 but you need a level converter (3.3v mode nodemcu) to protect the
nodemcu input pins.

At least you implement a communication protocol to send data between both boards.

f41*

esp8266 nodemcu

#include <SoftwareSerial.h>
SoftwareSerial mySerial(13, 15); // RX, TX nodemcu

void setup() {


Serial.begin(9600);
mySerial.begin(9600);
pinMode(13,OUTPUT);
}

void loop() {
char dato = Serial.read();
char dato2 = mySerial.read();

int tiempo = 100;
if (dato == 'S'){
mySerial.write(45);
digitalWrite(13, HIGH);
Serial.println("LETRA S ENVIADA");
}
if (dato == 'A'){
mySerial.write(58);
digitalWrite(13, LOW);
Serial.println("LETRA A ENVIADA");
}
if (dato2 == 58){

digitalWrite(13, HIGH);
Serial.println("LETRA S RECIBIDA");
}
if (dato2 == 45){

digitalWrite(13, LOW);
Serial.println("LETRA A RECIBIDA");
}



}