Interfacing

[viru409]

Here i  interfaced a GPS module which is working at 20Hz, with Arduino 2560 & receiving d data at pin no. 10. But  I want to see that gps data in LabView by interfacing arduino with it. How can I do this?

Thanks 
Regards 
VIRU

[crossrulz]

Most people use a serial port to communicate with an Arduino.  You can then use VISA in LabVIEW to talk over the serial port.

Do a search for LIFA (LabVIEW Interface for Arduino).  I haven't used it, but it is a commonly used library for this sort of thing.

[viru409]

I already done it with LabView using VISA serial but the problem is with using labview we are getting GPS data only at 5 to 6 Hz means 5 to 6 samples/sec but our actual requirement is 20Hz. Is there any limitation in using LabView serial port becoz if we are fetching the GPS data through microcontroller then it works at 20Hz.

[crossrulz]

What is your data format?  What is your protocol for the serial interface?  What baud rate are you using?

[Dennis_Knutson]

Can you attach an image of the block diagram?

[viru409]

Hi, here i am attching the block diagram which is used to read serial GPS data. Our GPS is set at 20 Hz but using this VI it is only working at 5/6 Hz.

[viru409]

Hi, here i am attching the block diagram which is used to read serial GPS data. Our GPS is set at 20 Hz but using this VI it is only working at 5/6 Hz.

[viru409]

The data format we are receiving is NMAE-0183 which is an GPS data protocol.

[crossrulz]

First of all, you don't need to have the property node for the Termination Character.  That is taken care of with the Configure Serial Port.  There is an input for the Termination Character on that VI on the top.  Wire your FALSE constant there.

Your slow down is most likely your saving to the file.  The Write To Spreadsheet File VI is really slow because it constantly opens, writes, and closes the file.  You should open the file at the start of the program and close it at the end.  Inside of the loop, you will need to format your data with the Array To Spreadsheet String function and then the Write To Text File.

You might also have to set up a Producer/Consumer.  This would move your file writing into another loop, allowing your serial read to go much faster since it and the file writing are done in parallel.

[viru409]

Hi, Thanks for your support. I want to read both $GPGGA & $GPRMC string in buffer at 20 Hz. But I am getting only $GPRMC as shown in Front panel.So how can i read both srtings at 20Hz.