Taking the Signal out through Serial comm port of pc

[mujahid]

Hello i am working on control of robotic arm motion using EMG signal i have processed the EMG that will control the motion of robotic arm now i have to take signal out from Labview using serial comm port of pc and then that siganl will be used to control the motion of RC servo motor Please tell me how i can take out processed signal of labview through Serial comm port.

Please suggest me some solution for this problem i have very limited time this is my Fianl year project.

Thanks
Waiting for your kind reply

M A Bhatti

[LV_Pro]

What do you mean "processed signal"? The serial comm port is just that, a serial comm port. It won't produce different levels (analog), it will produce "digital" high and low level signals, based on messages being sent through the serial port. If what you are asking is how to send messages through the serial port, there are examples in the LabVIEW "Help" "Find Examples" toolbar pull down. Search using "serial". If what you want is a varying analog signal, the serial comm port won't do that, you will need a Data Acquisition unit, with Analog out.

[smercurio_fc]

You should read this: http://en.wikipedia.org/wiki/RS-232

Note the section on voltage levels. You can't control them.

[mujahid]

Yes sir i want an analog signal from labview using serial comm port ...What will be solution for that?.

[smercurio_fc]

That's not really saying much. The serial port was not designed to control motors. It is a very low current device, and it's intended to be used for communication. You cannot control the voltage levels, although you can control the "on"/"off" state of some of the lines, like DTS. You haven't explained what you mean by "control the motion of the RC servo motor". What exactly does this mean? Does it take a varying voltage? Does it take a pulse? Does it take something else? Unless you provide some more details on what you have and what you are trying to do, all we can do is play guessing games.

[mujahid]

I want to ask that after processing any signal in Labview how i can get it out of computer using serial comm port

so that i can use it for any other purpose?.

[mujahid]

Dear we have to just connect the serial port with the microcontroller and in micrcontroller we will cotrol RC servo motor and from the labview we have to just send data Like "1" or "0".

There is another problem we are facing is that there is no serial port in the Laptops then how can we send required output for the microcontroller. 

[RavensFan]

Get a USB to RS-232 adapter.

http://www.cyberguys.com/product-details/?productid=2066#page=page-1

[LV_Pro]

If you are connecting a serial port to a microcontroller you will be probably sending "messages" to the microcontroller. As mentioned before there are example in the LabVIEW "Help":"Find Examples" pulldown on the toolbar. Search for "serial". As the previous poster mentions, there are inexpensive USB-Serial Adapters, which show up in Windows as a normal comm port. You will need to install National Instruments NI-Visa drivers to allow LabVIEW to access the serial port.