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Transmissive Light Sensor
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Another way to detect an object is for it to block the light. This is called a Transmissive Light Sensor. Figure 10-9 shows a gate where an object can roll between the LED and the LDR. Without an object in the gate, the light level will be 100, but it will drop to about 40 when the light is obstructed.
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Figure 10-9. Transmissive light application The program in Figure 10-10 will count how many times something has obstructed the light. First it waits for the light to become dark and then it waits for the light to become bright again. The Display Value My Block is used to put the Count value from the While Loop on the display.
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Figure 10-10. Counting program
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CHAPTER 10 LIGHT SENSOR WITH LED CONTROL
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There is an important concept illustrated by the program called hysteresis. The plot on the left in Figure 10-11 shows the light level as an object passes through the gate. If we greatly magnify the signal where it crosses the threshold, we would see a plot that looked something like the one on the right. The light level actually wiggles back and forth rapidly across the threshold because of the roughness on the object surface. If you set only a single threshold for light and dark, the program would count up several times while the object was only starting to obscure the light.
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Figure 10-11. Single threshold To prevent this, the dark threshold is set much lower than the light threshold. This dual threshold scheme is called hysteresis, and Figure 10-12 shows the two thresholds. Now, when the dark threshold is crossed, the light level would never wiggle back up to the light threshold. The program counts only when the object has completely passed through the gate.
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Figure 10-12. Two thresholds
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C H A P T E R 11
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LEGO Motor Interfaces
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The easiest way to extend the reach of your NXT inventions is to use the motors that came with it to operate the electronic controls of appliances and other equipment. The motor simply needs to be mechanically arranged to push the buttons, turn the knobs, or flip the switches on the external device to control it. The NXT motor makes it easy because it has a lot of torque and has built-in position feedback. Another easy way to{ LEGO motors:extending NXT with } extend the NXT is to use other LEGO motors. LEGO makes several other motors that are designed for use with less sophisticated sets. The shape and size of these motors may allow you to build creations that would be impossible with the NXT motors. Adapter cables are available that enable you to connect them directly to the NXT, but we ll show you how to make your own.
The Clapper
Buttons are common controls, and you can arrange the NXT motor to push them instead of you doing it. The exact mechanical design will vary from device to device, but you can operate anything from expensive laboratory equipment to disposable cameras this way. When you push buttons on a remote control, the NXT can practically control the world at least anything plugged into the wall. For example, Radio Shack sells a little handheld remote control that transmits to a base station with an electrical outlet in it. All kinds of lights and appliances can be plugged into it. In fact, this is the safest way to control this kind of power, and we highly recommend it. Figure 11-1 shows the handheld remote control and the mechanism used to push the on and off ends of the channel one button. The gears are being used only for their peg holes, not their teeth. The top gear acts as a driver, and the lower one acts as a guide. When the motor turns forward, the linkage pushes the on-end of the button; when the motor reverses, it pushes the off-end.
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