visual basic barcode scanner input PARTS LIST FOR SOUND DETECTOR. in Software

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TABLE 40.6 PARTS LIST FOR SOUND DETECTOR.
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IC1 Q1 R1 R2,R3 R4,R5 C1,C2 MIC1
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LM741 Op Amp IC 2N2222 transistor 500K potentiometer 6.8K resistor 1K resistor 0.47 F ceramic capacitor Electret condenser microphone
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The 567 is almost like a 555 in reverse. You select a resistor and capacitor to establish an operating frequency, called the center frequency. Additional components are used to establish a bandwidth or the percentage variance that the decoder will accept as a desired frequency (the variance can be as high as 14 percent). Fig. 40.11 shows how to connect a 567 to listen to and trigger on about a 1 kHz tone (refer to the parts list in Table 40.7). Before you get too excited about the 567 tone decoder, you should know about a few minor faults. The 567 has a tendency to trigger on harmonics of the desired frequency. You can limit this effect, if you need to, by adjusting the sensitivity of the input amplifier and decreasing the bandwidth of the chip.
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PASSIVE SOUND INPUT SENSORS 675
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+5 vdc
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Sensitivity A On 1 Off 0 14 13 12 11 10 9 8 Note: Tie unused inputs to ground.
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To pin 2 of op-amp
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On 1 Off 0
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Sensitivity B
FIGURE 40.10 Remote control of the sensitivity of the sound amplifier circuit. Under computer control, the robot can select the best sensitivity for a given task.
Another minor problem is that the 567 requires at least eight wave fronts of the desired sound frequency before it triggers on it. This reduces false alarms, but it also makes detection of very-low-frequency sounds impractical. Though the 567 has a lower threshold of about 1 hertz, it is impractical for most uses at frequencies that low. Yet another problem with the 567 is that it is officially discontinued by several of the manufacturers that used to make it. For the time being, however, you can still purchase 567 chips from most new and surplus retail and mail order electronics companies.
676 SOUND OUTPUT AND INPUT
+5 vdc
C4 1.0 F R2 2.2K
4 From amplifier in Fig.40.9 (pin 6, omit R4, R5 and Q1) 8 IC1 C3 2.2 F + 1 567 5 R1 5K 6 Decoded output
+ C2 1 F
7 C1 0.1
FIGURE 40.11 A 567 tone decoder IC, wired to detect tones at about 1 kHz.
PASSIVE SOUND INPUT SENSORS 677
TABLE 40.7
PARTS LIST FOR TONE DECODER.
IC1 R1 R2 C1 C2 C3 C4
567 Tone Decoder IC 50K 3- to 15-turn precision potentiometer 2.2K resistor 0.1 F ceramic capacitor 2.2 F tantalum or electrolytic capacitor 1.0 F tantalum or electrolytic capacitor 1.0 F electrolytic capacitor
Unless otherwise noted all resistors have 5 or 10 percent tolerance, 1/4-watt; all capacitors have 10 percent tolerance, rated 35 volts or higher. +5V
8 R1 1M 7 R2 1K
SPK1 (See Text) IC1 555 3
C2 0.1
C1 0.001 1 Frequence Range: Approx. 12Khz to 150 Hz.
FIGURE 40.12 A variable frequency tone generator, built around the common 555 timer IC. The tone output spans the range of human hearing, and then some.
BUILDING A SOUND SOURCE
With the 567 decoder, you ll be able to control your robot using specific tones. With a tone generator, you ll be able to make those tones so you can signal your robot via simple sounds. Such a tone-generator sound source is shown in Fig. 40.12 (refer to the parts list in Table 40.8). The values shown in the circuit generate sounds in the 48-kHz to 144-Hz range. To extend the range higher or lower, substitute a higher or lower value for C1. Basic design formulas and tables for the 555 are provided in App. E. For frequencies between about 5 kHz and 15 kHz, use a piezoelectric element as the sound source. Use a miniature speaker for frequencies under 5 kHz and an ultrasonic
678 SOUND OUTPUT AND INPUT
TABLE 40.8
PARTS LIST FOR TONE GENERATOR.
IC1 R1 R2 C1 C2 SPKR1
555 Timer IC 1-megohm potentiometer 1K resistor 0.001 F ceramic capacitor 0.1 F ceramic capacitor 4- or 8-ohm miniature speaker
All resistors have 5 or 10 percent tolerance, 1/4-watt; all capacitors have 10 percent tolerance, rated 35 volts or higher.
transducer for frequencies over 30 kHz. Cram all the components in a small box, stick a battery inside, and push the button to emit the tone. Be aware that the sound level from the speaker and especially the piezoelectric element can be quite high. Do not operate the tone generator close to your ears or anyone else s ears except your robot s.
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