Simple .NET/ASP.NET PDF document editor web control SDK

Figure 14-39. COM port information You can check the port numbers at any time by selecting the COM Ports tab on the Bluetooth Devices window, as in Figure 14-40. You should need to go through this whole process only once because your computer and the NXT will remember their paired relationship.

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Whether you need to use YFT or a similar technique is really up to your users The simplest approach is to test it with a group of representative users You could do this using paper-based or Web-based prototypes depending on where you are in the design process, but however you test it, you should get some user feedback before simply introducing complex Ajax usage You should also start small Your first attempt at using Ajax shouldn t be to create a dynamic portal site with adjustable columns Rather, begin by moving client-side validation to the server Once you get the hang of it, begin to venture into more dynamic uses, such as populating a dropdown list or setting some default text However you choose to apply Ajax, remember to not do anything wacky We know that this is not scientific advice.

F# programs are just text files, so you can use any text editor to create them. Just save your program with the extension .fs, and use fsc.exe to compile them. For example, if you had the following program in the text file helloworld.fs: #light print_endline "Hello World" you could just run fsc.exe helloworld.fs to compile your program into helloworld.exe, which would output the following to the console: Hello World In my opinion, the easiest and quickest way to develop F# programs is in Visual Studio in conjunction with the F# interactive compiler (see Figure 2-1). You can type F# programs into the text editor, taking advantage of syntax highlighting and IntelliSense code completion; compile them into executables; and debug them interactively by setting breakpoints and pressing F5. Also, you can execute parts of your code interactively using F# interactive. Just highlight the code you want to execute, and press Alt+Enter; F# interactive will execute the code and show the results. This is great for testing snippets individually.

Combining you and your NXT is one of the coolest combinations of them all. Galvanic Skin Response (GSR) is the most familiar term for the body s reaction to increased stress by increased sweating. The effect is commonly used for lie detectors and biofeedback monitors. The phenomenon has been observed for more than 100 years, and the modern medical term for it is Electrodermal Response, or EDR. When subjects become stressed, their sweat glands involuntarily become more active, and this lowers their skin s electrical resistance. The resistance measurement is basically the same as the salinity measurement discussed in 5. In this case, however, we make two electrodes to attach to the subject s skin. Because the hand has a large number of sweat glands that react with GSR, good locations for the electrodes are adjacent fingers on the same hand, as shown in Figure 14-41.

CHAPTER 2 I HOW TO OBTAIN, INSTALL, AND USE F#

However, at this point, there aren t any hard-and-fast rules Listen to your users, test before you deploy, and remember how quickly we all learned to hit the skip intro link You should be aware of a few common mistakes when using Ajax We ve already discussed providing visual clues to your users when something changes, but Ajax changes the standard Web approach in other ways First, unlike IFRAMES and hidden frames, making a request via XHR does not modify the history stack of your browser In many cases, this won t matter (how often have you clicked the back arrow only to discover that nothing has changed ), but if your users are expecting the back button to work, you will have some issues.

I Note If you are not convinced you want to invest in a copy of Visual Studio, trial versions of this software