Heu all, So I know how to read data from the arduino now I would like to start writing to the arduino I have read several posts on reading and writing but I seem to still be missing something. In this post the JohnCS suggests using the dimmer example that ships with the arduino I have uploaded this to my arduino I am wondering how I send the byte to the arduino through Labview I figure you use the VISA write.vi but I did not get what JohnCS said "which wants you to send a single character followed by a carriage control to change the LED" here is the link to the post: http://forums.ni.com/t5/LabVIEW/How-to-establish-serial-communication-between-Labview-and/m-p/845084#M383396 any help would be great thanks

Now you are going off into another direction by worrying about an analog input pin. You need to make sure you can get one thing working first. You say you don't think you have the serial communication working. Do what I said which is create a basic program that runs on the board and reads its serial port then turns around and writes the data right back. Then if you get your LV program to write and read, you'll know whether serial is working. I'd recommend making your wait statement a little larger, perhaps 250 to 500 milliseconds. If you're not sure the LED portion is working right, then make a basic program to run on the board that does nothing but blink the LED. Write a 255 to the port, wait a second, write a 0 to the port, wait a second, Loop. Once you know that both of these different features are working, then it should be a simple matter to get both aspects to work together in one program.

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LabVIEW

Write to Arduino

Solved!

VISA serial port communication with ardino is done in string format. So, 255 is read in ardino serial.read() as a string which cannot be written to analog port. This will not show any errors while compiling but will not get the desired result which we expect.

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LabVIEW

Write to Arduino

Re: Write to Arduino