Arduino to read from RS232 converter to TTL serial module (updated) Here's the system I want to work on:


The weight controller device detects weight which can transfer data via RS232 serial connection
I used RS232 converter to TTL serial module to connect the weight controller device to Arduino
The TTL connections were made to respective pins of Arduino UNO Board (GND-GND, VCC-5V, RX-0, TX-1)


The serial print from serial connection should produce 17 character length string : ST,GS    1.58,kg

Why am I getting strange results at times?

// Read Serial (RS232) data from Weight Controller Device via RS232 to TTL Converter Module

// Ignore the include statement, the editor does not allow pasting certain characters

include SoftwareSerial.h

int RX_PIN = 2;
int TX_PIN = 3;
int BAUD_IDE = 9600;
int BAUD_WEIGHT_SENSOR = 9600;

// serial port from weight controller
SoftwareSerial mySerial = SoftwareSerial(RX_PIN, TX_PIN);

void setup() {   
  mySerial.begin(BAUD_WEIGHT_SENSOR);
  Serial.begin(BAUD_IDE);
}


void loop() {
  while (mySerial.available()) {
    int inChar = mySerial.read();
    if (inChar != '\n') {
      serialData += (char)inChar;
    }
    else {
      int dataSize = serialData.length();
      Serial.print(serialData);
      Serial.print(" length:  "); 
      Serial.print(dataSize); 
      Serial.print("\n"); 
      delay(3000); 
      serialData = "";
    }
  }
  serialData = "";

}

// this one works perfectly but i want to store as string to process
// information and use for other functions
/*void loop() {
  if (mySerial.available()){
    Serial.print((char)mySerial.read());
You need to disconnect the Arduino`s RX and TX pins from any device before trying to upload a sketch via USB, because the Serial data is directly wired from the USB chip to these pins. It's as if you're trying to flash the thing behind your RS232 adapter.