Getting Wrong Output sending data through SERIAL PORT

Projects Programming
1

I am trying to send data from one esp32 to another esp32. But when the receiving end, esp32, receives data, it is something different, so I am not getting how the data is changed there or what I am doing wrong.
Here is my code master which is send data .

#include <HardwareSerial.h>

HardwareSerial SerialPort(2);

String number[10];
void setup()  
{
  Serial.begin(115200);
  SerialPort.begin(15200, SERIAL_8N1, 16, 17); 
  for (int i=0;i<10;++i) {
      number[i] = i;
  }

  
    Serial.println(number[5]);
} 
void loop()  
{
 for(int i=0;i<9;++i) {
    SerialPort.print(number[i]); 
  } 
  
  
}

At void setup, I stored an array with an int and tested with Serial.println(number[5]); and I could verify that the data is present in that.

and at void loop i am sending a data

for(int i=0;i<9;++i) {
    SerialPort.print(number[i]); 
  }

This is the slave code here, receiving end -

#include <HardwareSerial.h>
HardwareSerial SerialPort(2);
String number[10];
void setup() {
  Serial.begin(115200);
  SerialPort.begin(15200, SERIAL_8N1, 16, 17); 
  
}
 
void loop() {
  if(SerialPort.available()) {
    for (int i=0;i<9;++i) {
      number[i] = SerialPort.read();
    }
  }
  Serial.println(number[5]);
}

Here I am checking if the data is received and, if yes, storing it in the array. but when I print

Serial.println(number[5]);

The output should be 5 but i am getting output as 185

The output should be 5

Thank You

2

If this a number, why do you defined an array as String?

3

No it shouldn't, it should be the fifth byte in the string ( start counting from zero)

I notice in the sending code you never set the number variable to anything. All the line does is declared an empty array.

Do you know about arrays?

4

are you sure?

5 
for (int i=0;i<10;++i) {
      number[i] = i;
  }

I am inserting a number in array.

6

You did not answer to the question - why the array defined as String, if you intended to store integers?

7

I was practising I need to store a alphanumeric later so before doing that i was playing with this.

8

You can't use alphanumeric with this code because it reading only one byte to array element.

9

Yes exactly. I also figured out this is there anything i can do so that whole alphanumeric go at once. Literally confused on this one.

10

To practise try to replace the line

to this one:

byte number[10];

in both receiver and transmitter and test the new code.

11

No you are not. The "i" is an int and you are inserting an int into a String. God knows what the compiler is doing with that.
This is why

the output is not expected to be 5.

1 Like
12

You are right.
Class String doesn't redefine "=" operator...

13

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