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Connecting sensors to computers and microcontrollers Adding the sensation of touch Optical systems for detecting light Enabling the robot to move around in a room or house Adding a siren or other warning device
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29, Interfacing with Computers and Microcontrollers 35, Adding the Sense of Touch 37, Robotic Eyes 38, Navigating through Space 40, Sound Output and Input
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FIGURE 39.6 Using a heavy-duty solenoid to activate a fire extinguisher.
SOUND OUTPUT AND INPUT
he robots of science fiction are seldom mute or deaf. They may speak pithy warnings Danger, Will Robinson, Danger or squeak out blips and beeps in some advanced language only other robots can understand. Voice and sound input and output make a robot more humanlike, or at least more entertaining. What is a personal robot if not to entertain What s good for robots in novels and in the movies is good enough for us, so this chapter presents a number of useful projects for giving your mechanical creations the ability to make and hear noise. The projects include using recorded sound, generating warning sirens, recognizing and responding to your voice commands, and listening for sound events. Admittedly, this chapter only scratches the surface of what s possible today, especially with technologies like MP3 compressed digitized sound and ultracompact compact disc (and the ability to record them on a CD recorder connected to your computer). Alas, my publisher told me I had killed enough trees as it is and the book could not get any bigger, so this chapter must remain simply a primer on sound output and input.
Mechanically Recorded Sound Output
Before electronic doodads took over robotics there were mechanical solutions for just about everything. While they may not always have been as small as an electrical circuit, they were often easier to use. Case in point: you can use an ordinary cassette tape and playback
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662 SOUND OUTPUT AND INPUT
mechanism to produce music, voice, or sound effects. Tape players and tape player mechanisms are common finds in the surplus market, and you can often find complete (and still working) portable cassette players-recorders at thrift stores. With just a few wires you can rig a cassette tape player in the robot and have the sound played back, on your command. When looking for a cassette player try to find the kind shown in Fig. 40.1, which are solenoid controlled. These are handy for your robot designs because instead of pressing mechanical buttons, you can actuate solenoids by remote or computer control to play, fastforward, or rewind the tape. For most cassette decks you only need to provide power to operate the motor(s) and solenoids (if any) and a connection from the playback head to an amplifier. Since you are not using the deck for recording, you don t have to worry about the erase head, biasing the record head, and all that other stuff. If the deck already has a small preamplifier for the playback head, use it. It ll improve the sound quality. If not, you can use the tape head preamplifier shown in Fig. 40.2 (you can use a less expensive op amp than the one specified in the parts list in Table 40.1, but noise can be a problem). Place the preamplifier board as close to the cassette deck as possible to minimize stray pickup.
Electronically Recorded Sound Output
While mechanical sound playback systems are adequate, they lack the response and flexibility of a truly electronic approach. Fortunately, all-electronic reproduction of sound is fairly simple and inexpensive these days, in large part because of the wide availability of
FIGURE 40.1 A surplus cassette deck transport. This model is entirely solenoid driven and so is perfect for robotics.
ELECTRONICALLY RECORDED SOUND OUTPUT
+V R1 5K C1 0.1 R3 330K R2 100
7 6 Output
Input
LT1007 3 + 4
FIGURE 40.2 Preamplifier circuit for use with a magnetic tape playback head.
TABLE 40.1
PARTS LIST FOR CASSETTE TAPE HEAD PLAYER AMPLIFIER.
IC1 R1 R2 R3 C1
LT1007 low-noise operational amplifier (Linear Technology) 330K-resistor 4.9K resistor 100 ohm resistor 0. 1 F ceramic capacitor
All resistors have 5 percent tolerance, 1/8- or 1/4-watt, metal film; all capacitors have 10 percent tolerance, rated 35 volts or higher.
custom-integrated circuits that are designed to record, store, and play back recorded sound. Most of these chips are made for commercial products such as microwave ovens, cellular phones, or car alarms. In the following sections you ll learn about two approaches to electronically recorded sound output: hacking a sound recorder toy and using a special-purpose sound storage chip.
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