conversion from 'int' to 'String' is ambiguous

Using Arduino Programming Questions
1

Hi,
I am sending a data packet over my arduino serial pin and receiving it on my esp8266 nodemcu RX pin.

Arduino part i coded and works fine, I declared and array and used "Serial.write(array)" command.

But on receiving the same, for my esp8266 chip, there is a compilation error.
It is an assignment error "incompatible types in assignment".

How can i read this?

Thanks in advance

Below is my code:

// Import required libraries
#include "ESP8266WiFi.h"

String msg[1000];

// WiFi parameters
const char* ssid = "lenovo";
const char* password = "password";
void setup(void)
{ 
// Start Serial
Serial.begin(9600);
// Connect to WiFi
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Print the IP address
Serial.println(WiFi.localIP());
}
void loop() {
Serial.println("I am in loop, now the data part");
msg = Serial.readString();
Serial.println(msg);

}
2

An array of String with 1000 elements takes 6000 bytes of RAM, even if all the elements are empty.
Do you have 6000 bytes of RAM to spare?

3 
msg = Serial.readString();

msg is an array of String objects. Which element in the array are you trying to write to?

1 Like
4

True,

Thank you,

actually i have this packet incoming

"sprintf(msg,"SMKBXX,SMCXXX,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",....."

some 28 integers that i need to receive...

I do not understand how do i read this array "msg"
both Serial.read and Serial.readString throw me a compilation error.

5

How about:

#include "ESP8266WiFi.h"

String msg;

// WiFi parameters
const char* ssid = "lenovo";
const char* password = "password";
void setup(void)
{
  // Start Serial
  Serial.begin(9600);
  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  // Print the IP address
  Serial.println(WiFi.localIP());

}

void loop() {
  Serial.println("I am in loop, now the data part");
  msg = Serial.readString();
  Serial.println(msg);
}

(uncompiled, untested - sorry, I never use Strings, unless I can't avoid them)

6

Yep, that takes care of the compilation part.

Thanks..!!!

Hope this string will store 28 integers for me.

7

Hope this string will store 28 integers for me.

sp."Hope this String will store 28 integers for me."