Servos don't work

[Mike Betts]

Javier,

What program and platform are you using to communicate with the CMU2cam?

It would help to see the code you are using to initialize and command the CMU2cam. Also, what type of target you are seeking.

Be advised that this forum is for the FIRST robotic contest. The majority of posters here high school students and their experience is specific to a PIC18F8722 or PIC18F8520 hosting the CMU2cam on serial port 2 and targeting a bright green cold cathode target.

Regards,

Mike

[jpflorido]

Thanks Mike,

I'm using Visual Studio 2005 on Windows XP. The code is written in C#, but I also have tried with the GUI that the camera brought in Java and the servos didn't work either...

Here is the code I used:

// Set the COM1 serial port
SerialPort port = new SerialPort("COM1", 115200, Parity.None, 8, StopBits.One);

// Infinite ReadTime Out (default)
port.ReadBufferSize = 100000; // Size of the buffer: 100000 bytes
port.Open();
port.DiscardInBuffer(); // To empty the buffer


/* PART 1*/
port.Write("\r"); // Send command \r
while (((char)port.ReadByte()).Equals(':') == false) ;
// ':' received

/* PART 2*/
port.Write("SV 0 130\r"); // Send command SV to servo 0 at position 130
while (((char)port.ReadByte()).Equals(':') == false) ;
// ':' received


And for these two commands I received ACK....but the servos don't move!!!

Any tip...would be great.

Thanks again,
Javier.

[Mike Betts]

Javier,

I see nothing wrong in what you have done. In particular, I know that the GUI developed by CMU works just fine. In the absence of anything offbeat (like plugging in the servo backward), I think you may have a bad unit.

Regards,

Mike

[jpflorido]

Thanks Mike,

I've checked that there is no plugging in servo backward....so, as Mike says, it may be a bad unit...

Anyway, if somebody else had the same problem or knows any guess, would be great.

Thanks again,
regards,
Javier