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34.3.3 TESTING THE ALARM
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Once the smoke alarm circuit board is connected to the microcontroller or computer port, test it and your software by triggering the test button on the smoke alarm. The software should branch off to its I smell smoke subroutine. For a final test, light a match, and then blow it out. Wave the smoldering match near the smoke detector chamber. Again, the software runs the I smell smoke subroutine.
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34.3.4 LIMITATIONS OF ROBOTS DETECTING SMOKE
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You should be aware of certain limitations inherent in robot fire detectors. In the early stages of a fire, smoke tends to cling to the ceilings. That s why manufacturers recommend that you place smoke detectors on the ceiling rather than on the wall. Only when the fire gets going and smoke builds up does it start to fill up the rest of the room. Your robot is probably a rather short creature, and it might not detect smoke that confines itself only to the ceiling. This is not to say that the smoke detector mounted on even a 1-ft-high robot won t detect the smoke from a small fire; just don t count on it. Back up the robot smoke sensor with conventionally mounted smoke detection units, and do not rely only on the robot s smoke alarm.
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34.3.5 DETECTING NOXIOUS FUMES
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Smoke alarms detect the smoke from fires but not noxious fumes. Some fires emit very little smoke but plenty of toxic fumes, and these are left undetected by the traditional smoke alarm. Moreover, potentially deadly fumes can be produced in the absence of a fire. For example, a malfunctioning gas heater can generate poisonous carbon monoxide gas. This colorless, odorless gas can cause dizziness, headaches, sleepiness, and if the concentration is high enough even death.
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FIRE DETECTION SYSTEMS
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Just as there are alarms for detecting smoke, so there are alarms for detecting noxious gases, including carbon monoxide. Such gas alarms tend to be a little more expensive than smoke alarms, but they can be hacked in much the same way as a smoke alarm. Deduce the signal wires to the piezo disc and connect them (perhaps via a buffer and zener diode voltage clamp) to a computer port or microcontroller. Combination units that include both a smoke and gas alarm are also available. You should determine if the all-in-one design will be useful for you. In some combination smoke gas alarm units, there is no simple way to determine which has been detected. Ideally, you ll want your robot to determine the nature of the alarm, either smoke or gas (or perhaps both).
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34.4 Heat Sensing
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In a fire, smoke and flames are most often encountered before heat, which isn t felt until the fire is going strong. But what about before the fire gets started in the first place, such as when a kerosene heater is inadvertently left on or an iron has been tipped over and is melting the nylon clothes underneath If your robot is on wheels (or legs) and is wandering through the house, perhaps it ll be in the right place at the right time and sense these irregular situations. A fire is brewing, and before the house fills with smoke or flames the air gets a little warm. Equipped with a heat sensor, the robot can actually seek out warmer air, and if the air temperature gets too high it can sound an initial alarm. Realistically, heat sensors provide the least protection against a fire. But heat sensors are easy to build, and, besides, when the robot isn t sniffing out fires it can be wandering through the house giving it an energy check or reporting on the outside temperature or . . . you get the idea. Fig. 34-4 shows a basic but workable circuit centered around an LM355 temperature sensor (it and the other parts in the circuit are listed in Table 34-2). This device is relatively easy to find and costs under $1.50. The output of the device, when wired as shown, is a linear voltage. The voltage increases 10 mV for every rise in temperature of 1 Kelvin (K). Degrees Kelvin uses the same scale as degrees Celsius (C), except that the zero point is absolute zero about 273C. One degree Centigrade equals 1 Kelvin; only the start points
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