Arduino iot UART communication with scale

Projects Programming
1

Hi,
My goal is to get serial data from 2 scales using an RS232 cable.
I am using Arduino IoT 33.
I used Serial1(connecting to 0,1 pins) and it worked fine:

float weight;

void setup() {
  Serial.begin(9600);
  delay(2000);
  Serial1.begin(9600);
}

void loop() {
  #define PRINT_INTERVAL 1000
  static unsigned long lastPrintTime = 0;

  if ( millis() - lastPrintTime > PRINT_INTERVAL )
  {
    Serial.print("Weight: "); Serial.println(weight,4);
    lastPrintTime = millis();
  }
  
  getWeight();

}

void getWeight() {
  static String readString;
  if (Serial1.available())
  {
    char c = Serial1.read();
    readString += c;
    if ( c == 'g' ) {
      weight = readString.substring(9,16).toFloat(); 
      readString = "";
    }
  }
}

When trying to use SoftwareSerial things didn't work at all. I connected RX,TX to pins 5,6 and used this code:

#include <Arduino.h>
#include "wiring_private.h"

Uart mySerial (&sercom0, 5, 6, SERCOM_RX_PAD_1, UART_TX_PAD_0);

void SERCOM0_Handler()
{
    mySerial.IrqHandler();
}

float secondWeight;

void setup() {
  Serial.begin(9600);
  delay(2000);
  pinPeripheral(5, PIO_SERCOM_ALT);
  pinPeripheral(6, PIO_SERCOM_ALT);
  mySerial.begin(9600);
}

void loop() {
  #define PRINT_INTERVAL 1000
  static unsigned long lastPrintTime = 0;

  if ( millis() - lastPrintTime > PRINT_INTERVAL )
  {
    Serial.print("Second Weight: "); Serial.println(secondWeight,4);
    lastPrintTime = millis();
  }
  
  getSecondWeight();

}

void getSecondWeight() {
  static String readString;
  if (mySerial.available())
  {
    char c = mySerial.read();
    readString += c;
    if ( c == 'g' ) {
      secondWeight = readString.substring(9,16).toFloat(); 
      readString = "";
    }
  }
}

Nothing happens, what is my mistake? Eventually I want to use both Serial1 and mySerial together to get the input of both scales.
Thanks

2

You did not mention that you are using a RS-232 adapter with the unknown Arduino.

3

Yes you are correct, any thoughts on my question?

4

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