Servo motor does not work correct

[Demon]

It would help to know the specs of the motor, just to be sure.

To some, a servo is used to unlock a car door, to others it can turn specific degrees.

The more information you provide, the more people can help.

(those 4 signals make me think of a bi-polar stepper motor)

Robert

[EarlyBird2]

You could also post the vb.net program.

[cesar35]

Hello thank you guys for the help.
Here is the data I'm sending to the pic
With vb.net
I control the camera using servo motor for movement

Private Sub TrackBar1_Scroll(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TrackBar1.Scroll
pos = CInt(TrackBar1.Value)
Label8.Text = pos
SerialPort1.Write("PC")
SerialPort1.Write("X")
SerialPort1.Write(pos)

'POS MAX 2300
'POS MIN 7000
End Sub

[Demon]

As far as I know, X1 will be 0 first time through, maybe. I always set variables to 0 at top of program.

PAUSEUS will be nothing so SERVO1 will be turned OFF quite fast.

Then the PIC will wait for the next SERIN from the PC, it won't emit more pulses until then.

Assuming your MODE is configured properly.

Robert

[cesar35]

Hello Robert okay
you have to make an example as I do
I think I'm losing myself in programming
Between two pic I did worked.
With pc always had the difficulty.
Thank you.

[Demon]

Hello Robert okay
you have to make an example as I do
I think I'm losing myself in programming
...

Sorry, have chores to do.

You really should start small and add one thing at a time. I suggest you practice SERIN first, then add the pulses to the servo.

Robert


Edit: check out the PBP sample programs, they cover a LOT of material.

[cesar35]

[HenrikOlsson]

My VB is severly rusted but I think you've got a format mismatch between what VB is sending and what the PIC is expecting - as I suggested in a previous post.
I think that SerialPort1.Write(pos) will send the content of variable pos as an ASCII string while the PIC is expecting two binary bytes, not an ASCII string.
If that's the case you need to change the VB program or the PIC program, on the PIC side you can use the DEC modifier to recieve an ASCII string consisting of decimal digits and parse that into a value.

Again, there's a big difference between sending a byte as binary, ie 123 and sending it as an ASCII string. If you loop the TX to RX on the PC and fire up a terminal program, what does the data look like?

/Henrik.

[EarlyBird2]

Again, there's a big difference between sending a byte as binary, ie 123 and sending it as an ASCII string. If you loop the TX to RX on the PC and fire up a terminal program, what does the data look like?

/Henrik.

VB serialport.write defaults to ASCII characters so change PIC side and use DEC modifier.