Create Rx Tx

Projects Programming
8

With the change now I get blank when I have to show the pH value. The temperature shows it.
How would it be like you say? Sorry but I'm a novice in the Arduino world.
Yes, I'm trying to adapt. With an Arduino Mega for example it does work (several Serial ports) but I need to do it with an Arduino Nano and that is where I am finding all these problems.

#include <Adafruit_MAX31856.h>
#include <SoftwareSerial.h>
Adafruit_MAX31856 max_A = Adafruit_MAX31856(10, 11, 12, 13);
String termoparstring_A = "";
String sensorstring = "";
String inputstring = "";   
#define rxPin 7
#define txPin 6
SoftwareSerial Serial3 (rxPin,txPin);         
boolean input_string_complete = false;                
boolean sensor_string_complete = false;  
                                                       
void setup() {                                        
  Serial.begin(9600);     
                              
          pinMode(rxPin,INPUT);
          pinMode(txPin,OUTPUT);
         
         Serial3.begin(9600);
        inputstring.reserve(30);                            
        sensorstring.reserve(60); 
        max_A.begin();
        max_A.setThermocoupleType(MAX31856_TCTYPE_K);

}   

void loop() {                                         
termoparstring_A =(max_A.readThermocoupleTemperature());
Serial3.available(); 
Serial3.listen();  
   while (Serial3.available() > 0) {
   sensorstring = Serial3.readStringUntil(13);
   }
    sensor_string_complete = true; 
                                      
    Serial.println(termoparstring_A);
    Serial.println(sensorstring);
    delay(500); 
                                                                              
  sensorstring = "";                          
  sensor_string_complete = false;

}