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ASP.NET Web PDF Document Viewer/Editor Control LibraryIn this instance, the object has two properties, curbWeightInPounds and wheelCount, and their respective values are displayed within the Local Variables window. Up until now you ve probably been using alert boxes to show the values of variables during runtime. While this technique certainly works, it takes time to pepper your script with alerts, and each alert usually shows only one variable value at a time. After the script is debugged, you ll need to remove all those alert boxes, and if you ever need to debug again, you ll end up adding alert boxes again. With Venkman, all you have to do is set a breakpoint and use the Local Variables window to inspect the values of variables, and they are all there for quick access. Step back for a moment to think about how the Local Variables window makes Venkman an extremely powerful debugging tool. With one quick glance you are able to view the values of all the objects and variables that the JavaScript engine knows about. Using breakpoints, you barcode excel 2007 add in, free barcode generator add-in for excel, barcode fonts for excel free download, using barcode in excel 2010, active barcode in excel 2003, microsoft excel barcode generator software, barcode generator for excel 2010, create barcode macro excel, how to create barcode in excel 2003, barcode generator excel mac,Obtaining F# Figure 13-40. RC Servo control with PCF8591 The 8591 block has an input to set the value of the PCF8591 s analog output. The range is from 0 to 255, and the inner loop of the program in Figure 13-41 just counts over this range. Zero will position the shaft fully counterclockwise; 255 positions it fully clockwise. The design provides a slightly wider range of pulses than the Servo can travel, so there might not be motion at the extremes. You can download F# from the Microsoft Research F# Download page at http://research. microsoft.com/fsharp/release.aspx. The package includes various versions of the compiler, which are compatible with different versions of the CLR, fsi.exe (the F# interactive console), some F#-based parsing tools, the F# base class libraries, the F# documentation, and some F# samples. This first example is simple. It s a small HTML page with a single button. Clicking the button initiates an asynchronous request to the server. The server will respond by sending a simple static text file. The response is handled by displaying the contents of the static text file in an alert window. Listing 2-4 shows the HTML page and associated JavaScript. Listing 2-4. The simpleRequest.html Page <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Simple XMLHttpRequest</title> Installing F# on Windows is straightforward. You need to be running as an account with system administrator privileges to install F#. Simply unzip the contents of the F# distribution to a temporary location, and then run the InstallFSharp.msi package, which is in the root of the distribution. The .msi should work whether or not Visual Studio 2003 or Visual Studio 2005 is installed. If you d prefer not to use an .msi, you can compile from the command line simply by unzipping to your preferred location and running alternative-install.bat, which will install the F# runtime libraries into the global assembly cache (GAC). You can also use this batch file to install F# against the Shared Source Common Language Infrastructure (SSCLI), more commonly known as Rotor, by using the sscli command-line switch. You can use an NXT sensor port as both an I2C interface and as a passive sensor input at the same time. You ll put that feature to good use by building a reflective light Color Sensor. LEDs are used to flood an object with light at each of three colors: red, green, and blue. This is just like the LEGO Color Sensor, except the LEDs are discrete devices. The amount of reflected light from each color is measured with our old friend, the CdS LDR. It s an excellent sensor for this job because it can be easily read by the NXT input and has a spectral sensitivity close to human vision. Figure 13-42 shows the cluster of three LEDs surrounding the LDR and how heat shrink tubing has been fitted around them to keep their light from directly hitting the LDR.
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