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If you come across a component and you don t know what its resistance is, you can test it with an ohmmeter, which measures resistance, or a multimeter (Fig. 5-23) which measures ohms and several other types of values. Another function on the multimeter is the voltmeter to measure voltage. These testing tools usually have a dial where you can select the test type and an operating range. For example, in the pictured multimeter, if I want to test what I think is a 100 k photoresistor I would dial it to
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CHAPTER 5 Starting with Electronics
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Fig. 5-23.
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the 2 M range and apply the probes to the leads of the resistor. A result of 0.10 would be in the megaohm (0.1 M) range, meaning 100 k. More detailed information should come in your multimeter s instruction pamphlet. Try this out on several known resistors to get a feel for the process. Note that if your hands touch both of the leads on the component you are testing, or the metals tips of both probes, the resistance of your body will be tested in parallel with that of the resistor. It can by tricky to test a part without actually touching it, but it is important that you do. In addition to the multimeter, you should have at least one pair of small, needle-nosed or round-nosed pliers. The project itself is built on a breadboard, so it would help to have one of those too. For jumper wires, you can get a spool of solid-core wire in the 22 to 24 gauge size. The wire s gauge (ga or AWG for American Wire Gauge) is a measure of how big it is. The larger the gauge the smaller the wire s diameter. 24 ga wire is about 0.20 inch in diameter. It is easier to buy a package of
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precut, stripped, and bent wires than to make your own little wires to connect the parts on the breadboard. These come in many handy sizes and are colorcoded by length.
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Figure 5-24 shows the nal schematic for this project. We don t build it all at once, however, but start with one voltage divider using R1 and R2. Note that this is a simple extension of Fig. 5-19. The large arrow through R2 indicates that it has variable resistance. The two small arrows pointing into R2 indicate that it is sensitive to light. Together, these symbols tell us that this resistor changes its value based on the light hitting it. Put together the circuit shown in Fig. 5-25, our rst voltage bridge. Bend R1 so that it will t from the positive voltage rail to an interior row. The photoresistor can then be plugged into the next row over and into the ground rail. A short jumper then connects the two breadboard rows. Take your 9-volt clip and plug the red (positive) lead into the positive rail, and the black lead into the other rail. Finally, attach the battery. It can be di cult to test the voltage across di erent holes in a breadboard, since the probes tend not to t into the holes. You can always touch the probes to the leads of components plugged into the board.
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Fig. 5-24.
Final sensor circuit.
CHAPTER 5 Starting with Electronics
Fig. 5-25.
Photoresistor voltage bridge.
If you test the voltage from the positive rail to the ground rail, you will get a value something like 9 V. It won t be exactly 9 V, since the voltage across batteries changes with time and their charge. If you get a negative voltage reading, make sure the black probe goes to the black, ground, wire. With the circuit hooked up you can test it from two di erent perspectives. Try putting the positive probe on the 9 V rail (A) and the ground probe at the junction (B). When R2 is in bright light the AB voltage is nearly 9 V. In the dark, AB is about 4.5 V. Looking at the circuit from the perspective of BC, with the positive probe at B, you get readings near zero for bright light and again about 4.5 V in the dark. The circuit was designed to work in the BC mode, as indicated by the output lines in Fig. 5-25. In this mode, equation (5-8) is in e ect. Plug in the di erent values for R1 and R2 (R1 at 10 k and R2 at 10 k and 100 k) and see how the math works. When you reverse your measurement, like when you did the AB test, you also have to turn the equation upside down:   R1 5-11 Vout Vin R1 R2 Now add the second voltage bridge as shown in Fig. 5-26. Since R3 equals R4, the voltage at their junction is half of the input voltage. Now test the
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