C# SerialPort - Receiving extra 255 bytes

Projects Interfacing w/ Software on the Computer
8

Hackscribble,
Unfortunately no :frowning: Still six 255s after first Open() and four 255s after the second one.

Robin2,
Thanks for joinning to the discussion. I considered your proposition. I did two things to test it. But first of all I changed the Arduino's if condition to Serial.available() > 0.

  1. To confirm this is a C# issue I used the Arduino's serial monitor tool. I reset the arduino and then launched serial monitor tool and sent the 'A'. Arduino's LCD screen displayed "65-1-1-1-1-1-1". There wasn't any extra 255s.

  2. To confirm this is not a String issue i used int[] instead of it:

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  //Open Serial Port
   Serial.begin(9600);
   
   //Initialize LCD
   lcd.begin(16, 2);
}

void loop() {
  
  if (Serial.available() > 0)
  {    
    lcd.clear();
    
    int message[7];
    
    message[0] = Serial.read();
    message[1] = Serial.read();
    message[2] = Serial.read();
    message[3] = Serial.read();
    message[4] = Serial.read();
    message[5] = Serial.read();
    message[6] = Serial.read();
              
    lcd.print(message[0]);
    lcd.print(message[1]);
    lcd.print(message[2]);
    lcd.print(message[3]);

    lcd.setCursor(0, 1);

    lcd.print(message[4]);
    lcd.print(message[5]);
    lcd.print(message[6]);
  }
  
  delay(1000);
}

Output on Arduino's LCD using:

  • C# app: "255255255255255255-1"
  • Arduino's Serial Monitor: "65-1-1-1-1-1-1"

Unfortunately this looks like a pure C# issue :frowning: