Problem uploading to board.

Development Tools IDE 1.x
1

i dont know whats wrong with my arduino is not compiling my code no matter what i have restarted my laptop 3 times already disconnected my wire mouse coz i thought that mb coz i have others equipments connected to my laptop and still the same ERROR i just bought another arduino UNO coz i really dont know whats going on and same thing with the other one ;-;

this is the error

Arduino: 1.8.10 (Windows 10), Board: "Arduino/Genuino Uno"

Sketch uses 5550 bytes (17%) of program storage space. Maximum is 32256 bytes.
Global variables use 252 bytes (12%) of dynamic memory, leaving 1796 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "\\.\COM3": The system cannot find the file specified.


Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

and this is my code which doesnt present any error to the moment to verify it

#include <Servo.h> 

Servo servo1;  
Servo servo2;
Servo servo3; 
char a;
String readString; 
int Forwardmotor = 8;     //pins in the arduino UNO
int Backwardmotor = 9;
int speed = 255;   //(motor speed  0-255) 

void setup() {
  servo1.attach(5); 
  servo2.attach(6); 
  servo3.attach(7);
  servo1.write(0);   //initial servos position
  servo2.write(0);  // initial servos position
  servo3.write(90); //initial servos position
  pinMode(Forwardmotor, OUTPUT);
  pinMode(Backwardmotor, OUTPUT);
  
  Serial.begin(9600);
  delay(10);
}

void loop() {
 if (Serial.available()) {  
    a = Serial.read();
    
    if(a=='A'){       
      motor1();
    }
    
    if(a=='B'){                            
      motor2();
    }
     if(a=='F'){       
      motor3();
    }
    
    if(a=='C'){       //motor move forward                        
       analogWrite(Forwardmotor, speed);
       analogWrite(Backwardmotor, 0);
    }
    
    if(a=='D'){      //motor move backward                   
       analogWrite(Forwardmotor, 0);
       analogWrite(Backwardmotor, speed); 
    }

    if(a=='E'){     //motor stop                        
       analogWrite(Forwardmotor, 0);
       analogWrite(Backwardmotor,0);     
    }
  }
}  

  
void motor1(){ //servo motor 1   //servo motor get slider thumbsposition
        delay(10);   
        while (Serial.available()) { 
                           
          char c = Serial.read();  
          readString += c;        
        }
        if (readString.length() >0) {   
          Serial.println(readString.toInt());  
          servo1.write(readString.toInt());
          readString=""; // Clear string
        }
}

void motor2(){   //servo motor 2    //servo motor get slider thumbsposition
        delay(10); 
        while (Serial.available()) {                  
          char c = Serial.read();  
          readString += c;         
        }
        if (readString.length() >0) { 
          Serial.println(readString.toInt());  
          servo2.write(readString.toInt());
          readString=""; 
        } 
}

void motor3(){   //servo motor 3    //servo motor get slider thumbsposition
        delay(10); 
        while (Serial.available()) {                  
          char c = Serial.read();  
          readString += c;         
        }
        if (readString.length() >0) { 
          Serial.println(readString.toInt());  
          servo3.write(readString.toInt());
          readString=""; 
        } 
}

void motor12 (){ //servo motor 1 and 2 
  delay(10); 
        while (Serial.available()) {                  
          char c = Serial.read();  
          readString += c;         
        }
        if (readString.length() >0) { 
          Serial.println(readString.toInt());  
          servo1.write(readString.toInt());
          readString=""; 
          servo2.write(readString.toInt());
          readString=""; 
        } 
}
2

COMMON ISSUES

  • Ensure you have FULLY inserted the USB cables.
  • Check you have a COMMON GROUND where required. ( Thanks Perry)
  • Where possible use USB 2.0 ports or a USB 2.0 POWERED HUB to rule out USB 3.0 issues.
  • Try other computers where possible.
  • Try other USB leads where possible.
  • You may not have the correct driver installed. CH340/341 or CP2102
  • There may be a problem with the board check your wiring first.
  • Remove any items connected to pins 0 and 1.

Bob.

3

I would start by checking what Windows Device Manager says when you connect the board. Is it still COM3?

4

@Nathalia A few things to try....

Before uploading the file to the arduino check that the 'correct' com port is selected as another device may be using a com port without you knowing.

If you still have issues, try removing 1.8.10 and installing 1.8.9 instead. I had problems with 1.8.10 and roling back to 1.8.9 cured them all!

Good Luck!