birt barcode tool Figure 14-42. Finger electrode construction Figure 14-43 shows the two completed electrodes. in Font

Creator Denso QR Bar Code in Font Figure 14-42. Finger electrode construction Figure 14-43 shows the two completed electrodes.

Figure 14-42. Finger electrode construction Figure 14-43 shows the two completed electrodes.
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Figure 14-43. Completed finger electrodes The program in Figure 14-44 is about the simplest GSR program you can write. The program makes a continuous tone whose frequency is roughly proportional to the skin s resistance. The first Math block makes the frequency higher for lower skin resistance. That way, increased stress relates to increased frequency. The second block magnifies the range of frequency by a factor of 6. Finally, the Sound block is
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CHAPTER 14 COOL COMBINATIONS
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configured with the window shown in Figure 14-44. Notice that the block is set for Tone, low volume, and not to Wait for Completion. Because the Sound block ignores negative frequency inputs, when the electrodes aren t connected to anyone, there isn t any audible tone.
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Figure 14-44. Simple GSR program The program can be used for a variety of experiments. For example, in biofeedback conditioning, the objective is to learn to relax your body. This would be the same as lowering the body s stress level, and that can be measured as a rising skin resistance. After connecting the electrodes and starting the program, the goal is to make the tone frequency go lower over time. Most people achieve this by relaxing their muscles, taking slow deep breaths, and clearing the mind of anxiety-producing thoughts. When used as a lie detector, the connected subject is asked a series of questions. If subjects answer untruthfully, their body stress level rises, which can be detected as arising frequency tone.
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APPENDIX A
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Construction Techniques
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Building the more advanced projects in this book might require you to learn some new skills. Most electronic products today use construction techniques that involve parts so small you need a microscope to handle them. Fortunately, larger electrical components that you can reasonably work with are still available. Methods to build with these parts have been around for decades, and everything you need is available at Radio Shack or other electronic distributors. For the I2C bus projects in 13, Mindsensors sells prototype boards for the PCF8574 and PCF8591 integrated circuits. They save you from making many of the connections and include the unique NXT socket that saves you from having to cut cables.
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Solderless Breadboard
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The first tool to become familiar with is the solderless breadboard. The term breadboard dates back to when electronic hobbyists literally built projects on a plank of wood intended for cutting bread. Many styles of breadboards are available, but they all consist of columns of interconnected holes used for connecting components and a few long rows of holes at the top and bottom used for connecting power. Radio Shack sells a small breadboard (Catalog Number: 276-175) that is big enough to build all the projects in this book (see Figure A-1). A nice feature of this particular breadboard is that it has row- and column-identification marks that make construction easier. Throughout this book, we indicate the exact row and column where you should insert the lead of a device. By following these instructions precisely, your chance of making a mistake will be greatly reduced.
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APPENDIX A CONSTRUCTION TECHNIQUES
Figure A-1. Solderless prototype breadboard
Building on the Breadboard
We demonstrate the construction process through a simple example. Figure A-2 shows a minimal 9V powered sensor design. The design just takes care of separating the power and sensor read parts of the 9V powered interface described in 9. Nevertheless, the circuit is useful for voltage input where measured voltage is something that can t be loaded by the NXT internal 10k resistor. It has only four parts, listed in the bill of materials in Table A-1.
White
D1 R1 4
+ C1 + U1A 11 3
+ Input
Black
Figure A-2. Voltage input
APPENDIX A CONSTRUCTION TECHNIQUES
Table A-1. Bill of Materials
Component
U1 D1 R1 C1
Part Number
LM324 1N4148 1k 22uF
Description
Quad OpAmp Small Signal Diode 1/4 W 5% Carbon Film Resistor 16V or higher Electrolytic Capacitor
Radio Shack
276-1711 276-1122 271-1321 272-1014
All the parts have been placed on the breadboard in Figure A-3. Most of the parts have long leads to start with, and you could insert them into the same holes without cutting them shorter, but you run the risk of accidentally touching the leads together, creating short circuits.
Figure A-3. Components on the solderless breadboard Construction consists of going down row by row in Table A-2 and connecting one component at a time. The start column corresponds to the first listed end of the part and the end corresponds to the last. For example, C1 s start is the positive (+) lead, and the end is the negative ( ) lead. J1, J2, and J3 are just wire jumpers.
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