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CHAPTER 14 COOL COMBINATIONS
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Figure 14-33. Live Video and BricxCC Joystick Tool Usually both the NXT-G environment and BricxCC do a good job of automatically finding the NXT and making a Bluetooth connection for wireless control. The process is called pairing, but unfortunately it doesn t always seem to work. Sometimes it helps to establish the Bluetooth connection another way, and we ll go through that process step by step. Start by opening the Windows Control Panel and doubleclicking the Bluetooth Devices icon, as shown in Figure 14-34.
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Figure 14-34. Windows Control Panel A window with your known Bluetooth Devices shows up, as shown in Figure 14-35. If there s already an NXT device in the window, select it and click the Remove button. Don t worry; you ll reconnect to it in just a moment. When the NXT device icon is gone, click the Add button.
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Figure 14-35. Devices tab of the Bluetooth Devices window An Add Bluetooth Device Wizard opens, as in Figure 14-36. Make sure that your NXT is turned on and then select the check mark in the wizard that says My device is set up and ready to be found. Then click the Next> button.
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Figure 14-36. Add Bluetooth Device Wizard welcome window
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After searching, the NXT Bluetooth icon should show up, as in Figure 14-37. Double-click the icon, and the passkey window opens.
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Figure 14-37. Double-clicking the NXT Bluetooth icon In the passkey window (see Figure 14-38), select Let me choose my own passkey and enter 1234. Then select the Next> button. The NXT should make a little chirping noise, and you ll need to confirm the passkey by pressing the orange button.
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Figure 14-38. Passkey window
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The Completing the Add Bluetooth Device Wizard window looks like Figure 14-39; it shows the COM ports that the NXT will be using. The lower number of them, COM9 in this case, is the one you need to enter in some of the alternative remote-control programs.
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.
Figure 14-40. COM Ports tab of the Bluetooth Devices window
CHAPTER 14 COOL COMBINATIONS
Galvanic Skin Response Meter
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.
Figure 14-41. Galvanic Skin Response meter
CHAPTER 14 COOL COMBINATIONS
Finger electrodes are made by adding some aluminum foil to self-adhesive Velcro. (This type of Velcro comes in long strips and can be purchased from sewing supply stores.) Figure 14-42 shows all the parts of the assembly. You connect the electrode wires to the NXT Sensor Input Pin 1 and 2 (white and black wires) using any of the methods discussed in the previous chapters. Another easy method is to simply cut the LEGO 9V connector from a NXT adapter cable, split the pair of wires, and strip their ends.
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