Go Down

Topic: Control Servo With VB 2010 Problem (Read 1 time) previous topic - next topic


Mar 27, 2013, 04:47 pm Last Edit: Mar 27, 2013, 04:49 pm by mamette Reason: 1
Hi, i want to make servo position control with VB 2010. For first try, i want to control servo between 0 - 100 degrees. In VB 2010 i use trackbar to control servo, and i setting the trackbar value between 0 and 10. So, 1 trackbar value represent 10 degree of servo movement. When i tried the system, it works, but there is a problem, the system will works well if the trackbar value ranged between 0 - 9. When i move trackbar value to 10, the servo must be move to 100 degree, but it goes wrong, the servo move to 0 degree, looks like arduino read the trackbar value is 0 not 10.

Then i do other experiment, and the conclusion is arduino only execute trackbar value between 0 and 9. When it between 10-19, or 20 and 29, and so on, arduino will read it as 0 - 9.

Well, how to solve this problem?
Thank you

this is my Arduino Code:
Code: [Select]
#include <Servo.h>

Servo myservo;  // create servo object to control a servo

int val,pos;

void setup()
 myservo.attach(A0);  // attaches the servo on pin 9 to the servo object
 Serial.begin(115200); //begins serial communication
void loop()

void serialControl() {
 if (Serial.available()){
   pos=int(Serial.read());     //reads the value sent from Visual Basic  
       val=0;   //rotates the servo 0 degrees
     else if(pos=='1')
     else if(pos=='2')
     else if(pos=='3')
     else if(pos=='4')
     else if(pos=='5')
     else if(pos=='6')
     else if(pos=='7')
     else if(pos=='8')
     else if(pos=='9')
     else if(pos== '10')

And this is my VB 2010 Code:
Code: [Select]

Imports System.IO
Imports System.IO.Ports
Imports System.Threading

Public Class Form1

   Shared _continue As Boolean
   Shared _serialPort As SerialPort

   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       SerialPort1.PortName = "com18" 'you need to check which com port your arduino is using, and change them if you need
       SerialPort1.BaudRate = 115200
       SerialPort1.DataBits = 8
       SerialPort1.Parity = Parity.None
       SerialPort1.StopBits = StopBits.One
       SerialPort1.Handshake = Handshake.None
       SerialPort1.Encoding = System.Text.Encoding.Default
   End Sub
   Private Sub Label1_Click(sender As System.Object, e As System.EventArgs) Handles Label1.Click

   End Sub

   Private Sub TrackBar1_Scroll(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TrackBar1.Scroll
       TextBox1.Text = TrackBar1.Value
   End Sub

   Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

   End Sub

End Class


Mar 27, 2013, 04:59 pm Last Edit: Mar 27, 2013, 05:02 pm by AWOL Reason: 1
Code: [Select]
else if(pos== '10')
You can't transmit and receive two characters like that - you need to form them into a string.
This question comes up every other day here in some form or another.

The problem is, your code receives a '1', moves the servo to 10 degrees,then very shortly after (less time than a servo frame), it receives the '0' and moves the servo to 0 degrees.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.


If you have a slider, you are converting the slider value to a string to send to the Arduino. Stop doing that. Send the value as a (binary) value. Then, you can read the servo position as a single value (from 0 to 255).
The art of getting good answers lies in asking good questions.

Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131