Need Help!

Projects Programming
1

Could you please tell me what this means and how to resolve the problem

at gnu.io.RXTXPort.eventLoop(Native Method)
at gnu.io.RXTXPort$MonitorThread.run(RXTXPort.java:1575)
Error inside Serial.serialEvent()
java.io.IOException: Bad file descriptor in nativeavailable
at gnu.io.RXTXPort.nativeavailable(Native Method)
at gnu.io.RXTXPort$SerialInputStream.available(RXTXPort.java:1532)
at processing.app.Serial.serialEvent(Serial.java:215)
at gnu.io.RXTXPort.sendEvent(RXTXPort.java:732)
at gnu.io.RXTXPort.eventLoop(Native Method)
at gnu.io.RXTXPort$MonitorThread.run(RXTXPort.java:1575)
Error inside Serial.serialEvent()
java.io.IOException: Bad file descriptor in nativeavailable
at gnu.io.RXTXPort.nativeavailable(Native Method)
at gnu.io.RXTXPort$SerialInputStream.available(RXTXPort.java:1532)

Thanks

2

This means that you really think we are mindreaders...?

Where is the code?
:wink:

Cheers,
Kari

3

Oops sorry

#include <Servo.h>

int LedPin1 = 12;
int LedPin = 13;
int MotorPin1 = 9;
int MotorPin2 = 10;
int servoPin = 11;

Servo VishalServo;

void setup()
{
digitalWrite(LedPin, HIGH);
Serial.begin(9600);
pinMode(LedPin, OUTPUT);
pinMode(LedPin1, OUTPUT);
pinMode(MotorPin1, OUTPUT);
pinMode(MotorPin2, OUTPUT);
VishalServo.attach(servoPin);
VishalServo.writeMicroseconds(1500);
delay(2000);
}

void loop()
{
while (Serial.available() == 0);
int val = Serial.read() - '0';

int i = VishalServo.read();

if (val == 2)
{
Serial.println("Robot is On");
digitalWrite(MotorPin1, HIGH);
digitalWrite(MotorPin2, HIGH);
delay (1000);
digitalWrite(MotorPin1, LOW);
digitalWrite(MotorPin2, LOW);
}

if (val == 1)
{
Serial.println("Robot is turning left");
digitalWrite(MotorPin2, HIGH);
delay(1000);
digitalWrite(MotorPin2, LOW);
}

if (val == 3)
{
Serial.println("Robot is turning right");
digitalWrite(MotorPin1, HIGH);
delay(1000);
digitalWrite(MotorPin1, LOW);
}

if (val == 7)
{
Serial.println("Turning left");
VishalServo.write(i+30);
}

if (val == 9)
{
Serial.println("Turning right");
VishalServo.write(i-30);
}

if (val == 5)
{
Serial.println("Shoot");
digitalWrite(LedPin1, HIGH);
delay(25);
digitalWrite(LedPin1, LOW);
}

if (val == 8)
{
Serial.println("Centering");
VishalServo.writeMicroseconds(1500);
}

else
{
Serial.println("Invalid!");
}
}

When I open the place where we can communicate with the arduino and type in commands then this error appers and my servo goes all jerky and keeps going left,right rapidly.

4

vishalapr:
Oops sorry

#include <Servo.h>

int LedPin1 = 12;
int LedPin = 13;
int MotorPin1 = 9;
int MotorPin2 = 10;
int servoPin = 11;

Servo VishalServo;

void setup()
{
digitalWrite(LedPin, HIGH);
Serial.begin(9600);
pinMode(LedPin, OUTPUT);
pinMode(LedPin1, OUTPUT);
pinMode(MotorPin1, OUTPUT);
pinMode(MotorPin2, OUTPUT);
VishalServo.attach(servoPin);
VishalServo.writeMicroseconds(1500);
delay(2000);
}

void loop()
{
while (Serial.available() == 0);
int val = Serial.read() - '0';

int i = VishalServo.read();

if (val == 2)
{
Serial.println("Robot is On");
digitalWrite(MotorPin1, HIGH);
digitalWrite(MotorPin2, HIGH);
delay (1000);
digitalWrite(MotorPin1, LOW);
digitalWrite(MotorPin2, LOW);
}

if (val == 1)
{
Serial.println("Robot is turning left");
digitalWrite(MotorPin2, HIGH);
delay(1000);
digitalWrite(MotorPin2, LOW);
}

if (val == 3)
{
Serial.println("Robot is turning right");
digitalWrite(MotorPin1, HIGH);
delay(1000);
digitalWrite(MotorPin1, LOW);
}

if (val == 7)
{
Serial.println("Turning left");
VishalServo.write(i+30);
}

if (val == 9)
{
Serial.println("Turning right");
VishalServo.write(i-30);
}

if (val == 5)
{
Serial.println("Shoot");
digitalWrite(LedPin1, HIGH);
delay(25);
digitalWrite(LedPin1, LOW);
}

if (val == 8)
{
Serial.println("Centering");
VishalServo.writeMicroseconds(1500);
}

else
{
Serial.println("Invalid!");
}
}

When I open the place where we can communicate with the arduino and type in commands then this error appers and my servo goes all jerky and keeps going left,right rapidly.

5

I DO NOT KNOW WHY THERE IS A SMILY FACE COMMING IN : if (val = 8)

6

Maybe if you put your code in a code box using the # icon, you wouldn't get smilies.

7

Why is a smily face comming when I type 8

8

Ok but could you please tell me what to do to remove this error

9

Post your code in a code box, not a quatation.

Why does it always print "Invalid" unless you type "8"?

10

What do you mean?

11

I mean that when you type in "5", it prints "Shoot" "Invalid".
Why does it do that?

12

I dont know could you tell me how to remove it.

Thanks

13

Read zoomkat's comments about the power supply

14

You need to power the servo and motor(s) separately.

15

es I am Im powering the motors via 2 external 9 V batteries(1 battery for 1 motor) and I am powering the servo off the arduino

16

But it doesn't move with the power supply you've got at the moment, so what's the difference?

Try four AAAs instead.

17

Ok

18

and I am powering the servo off the arduino

Will not work

19

I connected it to 4 external batteries but the servo just doesn't want to work when I connect it to an external power supply.And yes I did connect the arduino ground to the batteries ground.

Please help...

20

After two pages here, you should show the circuit you are using.

Cheers,
Kari