fire alarm using thermistor
advantages and disadvantages
The IC1 (NE555) is configured as a free running oscillator at audio frequency. The transistors T1 and T2 drive IC1. The output (pin 3) of IC1 is couples to base of transistor T3 (SL100), which drives the speaker to generate alarm sound. The frequency of NE555 depends on the values of resistances R5 and R6 and capacitance C2. When thermistor becomes hot, it gives a low-resistance path for the positive voltage to the base of transistor T1 through diode D1 and resistance R2. Capacitor C1 ....etc

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INTRODUCTION
There is a variety of temperature sensors on the market all of which meet specific application needs. The most common sensors that are used to solve these application problems include the thermocouple, Resistive Temperature Detector (RTD) thermistor, and silicon- based sensors. For an overview and comparison of these sensors, refer to Microchip s AN679, Temperature Sensing Technologies . This application note focuses on circuit solutions that use Negative Temperature Coefficient (NTC) thermistors in the design. The Ther ....etc

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http://seminarsprojects.net/Thread-fire-fighting-robot--21445

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An Introduction to Automatic Fire Sprinklers

by Nick Artim


Abstract
Museum management is entrusted with the responsibility of protecting and preserving the institution's collections, operations and occupants. Constant attention is required to minimize adverse impact due to climate, pollution, theft, vandalism, insects, mold and fire. Because of the speed and totality of its destructive forces, fire constitutes one of the more serious threats.
Collections must be safeguarded from fire. Vandalized or environmentally d ....etc

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To get full information or details of fire fighting robot please have a look on the pages

http://seminarsprojects.net/Thread-Fire-Fighting-Robot-Design

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hydraulic intensifier is a hydraulic machine to transform hydraulic energy at low pressure in a volume reduced to a higher pressure

Such a machine can be built by mechanically linking the two pistons, each working in a cylinder separated with a different diameter. As the pistons are mechanically connected, their strength and their stroke length are the same. If the diameters are different, the hydraulic pressure in each cylinder varies in the same ratio as their areas: the small piston giving birth at a pressure more high. When the pressure ....etc

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