barcode generator c# wpf Figure 10-31 The sound-activated switch in Software

Drawing QR Code in Software Figure 10-31 The sound-activated switch

Figure 10-31 The sound-activated switch
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when you will have to lower the setting of the 100K variable resistor to reduce the input sensitivity The variable resistor is also handy if you want your audio source to share the sound-activated switch with an amplifier through a splitter cable so your visitors can hear the sound as well If you find that this simple sound-activated switch works well with your mechanical displays, then you may even consider building a multichannel activator so you can sync your entire Halloween show with one or more audio sources Any stereo sound player will offer two independent audio channels, so you could edit a control file on your computer using sound-editing software, which would allow precise triggering of two synchronized channels How about running a microphone into a voice changer connected to the sound-activated switch to make the jaws of a
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flesh-eating Jack-O-Lantern chomp up and down as you recite evil phrases into the microphone Yes, the possibilities are endless with the last two
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projects combined, and I really like that flesheating Jack-O-Lantern idea, so I am going to show you how I pulled it off in the next project!
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Project 47 Flesh-eating Jack-O-Lantern
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Project 47 Flesh-eating Jack-O-Lantern
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A lot of people have a Jack-O-Lantern at their doorstep on Halloween, but only a true Evil Genius has one that will try to attack your guests Yes, indeed, by using the universal motivator and the sound-activated switch presented in the last two projects, you can bring that boring old vegetable to life with a vengeance Normally, I would use a real pumpkin for something like this, inserting a hinged metal brace between the two halves to make a jaw, but dude, we wrote this book in the spring and our pumpkin plant was only an inch high, so we had to make one from some parts found at a hardware store You could also use one of those plastic Jack-O-Lanterns, but they always seem to look too happy for my taste Evil I need evil! Let s start by remembering some of the art we made in public school using a messy yet inexpensive technique called paper mach , a simple technique that is actually great for making masks, pi atas, props, and various hideous dead things With some paint, flour, and newspaper strips, you can actually sculpt some very decent-looking large props around wire or balloons ranging in size from fist size to life size I wanted a large Jack-O-Lantern with shark-like teeth that looked like it could swallow half an adult in one bite, so I went on a tour of a local hardware store looking for an inexpensive round thing that could be used as the body I found various pots and planters in the gardening department that were about the right size, including the two 24-inch diameter hanging planters shown in Figure 10-32, which had solid wire frames and some kind of thick liner material that would be perfect for covering with paper mach Because I wanted the two planters to form a hinged jaw, allowing the Jack-O-Lantern to chomp its evil teeth, I had to install a hinge between the two halves by welding it to the metal screen as
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Figure 10-32 These two planters will form a sphere
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shown in Figure 10-33 A welder comes in handy for these small jobs, but if you do not have one, then fastening the hinge will have to be done with bolts and large washers or tubing clamps If you plan to use similar planter frames, be mindful of the position of the wire as you orient the hinge so that the area you plan to cut out for eyes later will not be obstructed by the wire frame The lightweight wire frames should open and close with ease once the hinge is secured to each half
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mach would be needed to make a rigid covering I had to trim the liners down and tie wrap them to the frames so that the two halves would close, but other than that, they were perfect It s too bad the liners would not fit around the outside of the globes to form the outer skin, but they were just too small to stretch around, so they will have to become interior liners Figure 10-34 shows the trimmed and fastened interior liners held to the screen globes using a few tie wraps Now for the messy fun, adding a paper-mach skin to the outside of Jack s body to hide the wire screen and create a paintable surface This process can be done with regular flour, wallpaper paste, and many other combinations of inexpensive materials, so hit Google up for paper mach to find out which method you might prefer As my evil helper Kathy demonstrates (Figure 10-35), you basically dip newspaper shreds into a mixture of gooey baking flour mixed with water, run off the excessive mixture between your fingers, place the gooey paper strips on to the object you want to skin, then let it harden overnight into a rigid and paintable surface that can be cut or added to later For a more rigid final product, use three or more layers of newspaper, and for single-use objects that will not be handled, two layers will usually suffice The wet newspaper strips are worked into each other with your hands
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