To receive Float data from Arduino Mega to Node MCU

[veer1204]

I am receiving data as "4" instead of "4.51".

Here is the code for NodeMCU:

#include <SoftwareSerial.h>
SoftwareSerial s(D6, D5);

float receivedData; // Define an integer variable to store received data

void setup() {
  Serial.begin(9600); // Initialize the Serial monitor
  s.begin(9600);     // Initialize SoftwareSerial
  while (!s) {
    ;
  }
}

void loop() {
  // Read data from SoftwareSerial
  if (s.available()) {
    char receivedChar = s.read(); // Read a character from Arduino Mega
    
    if (receivedChar == '\n') {  // End of transmission, process received data
    
      Serial.print("Data Received = ");
      Serial.println(receivedData);
      delay(1000);
      
    } else {
      receivedData = (receivedChar);
    }
  }
}

[UKHeliBob]

Welcome to the forum

@veer1204

Here is the code for NodeMCU:

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the < CODE/ > icon above the compose window) to make it easier to read and copy for examination

https://forum.arduino.cc/t/how-to-get-the-best-out-of-this-forum

[sterretje]

Also, please post the code for the Mega.

Copying a char into a float is usually need going to do what you expect it to do.

You need to fill a char array with the received characters and once you have detected a '\n' convert it to a flat using e.g. atof().

If you read through Serial Input Basics - updated, you might get ideas.

[ruilviana]

try use receivedData = s.parseFloat();

#include <SoftwareSerial.h>
SoftwareSerial s(D6, D5);

float receivedData; // Define an integer variable to store received data

void setup() {
  Serial.begin(9600); // Initialize the Serial monitor
  s.begin(9600);     // Initialize SoftwareSerial
  while (!s) {
    ;
  }
}

void loop() {
  // Read data from SoftwareSerial
  if (s.available()) {
      receivedData = s.parseFloat();
      Serial.println(receivedData);
      delay(1000);
  }
}