To get full information or details of fire alarm using ldr please have a look on the pages

http://seminarsprojects.net/Thread-simple-fire-alarm-circuit

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advantages and disadvantage of light alarm circuit with ldr

The dominant of street lights, outside lights, a number of indoor home appliances, and so on are typically operated and maintained manually on many occasions. This is not only risky, however additionally leads to wastage of power with the negligence of personnel or uncommon circumstances in controlling these electrical appliances ON and OFF. Hence, we can utilize the light sensor circuit for automatic switch OFF the loads based on daylight s intensity by employing a light sensor. Thi ....etc

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Industrial protection system using light resistor
SUMMARY
This project is designed mainly to protect the equipment against fire. For any application in the industry there are a lot of options that will be processed. That we must control the values of the physical parameters using some sensors. Those are nothing like temperature, humidity, pressure, the level of smoke and light intensity etc, when fire mishap occurs the environmental changes of temperature, humidity, smoke and light intensity. In that we focus on the intensity of the light. To r ....etc

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Hi,am a college student doing a project on fire alarm using a thermistor. i humbly need your help in my project and your help will be much appreciated. i need advantages of using this kind of fire alarm. ....etc

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This power failure alarm project is a power supply monitoring device that will trigger a buzzer when the mains supply cuts off. At the same time, the light emitting diode will be turned ON. This device is helpful to inform the loss of power supply to some critical installation such as a pump in a fish tank. Once the buzzer sound, you will know that there is a loss of power supply and actions need to be taken to rectify the situation by providing alternative power supply or relocating the installation. ....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-microcontroller-based-fire-fighting-robot-full-report?pid=40381&mode=threaded

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

http://seminarsprojects.net/Thread-microcontroller-based-fire-fighting-robot-full-report?pid=15403&mode=threaded

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Simple Fire Alarm Circuit
Here is a simple fire alarm circuit based on a LDR and lamp pair for sensing the fire.The alarm works by sensing the smoke produced during fire.The circuit produces an audible alarm when the fire breaks out with smoke.
When there is no smoke the light from the bulb will be directly falling on the LDR.The LDR resistance will be low and so the voltage across it (below .6V).The transistor will be OFF and nothing happens.When there is sufficient smoke to mask the light from falling on LDR, the ....etc

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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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In the past, hardwired alarm systems are the only choice for customers who need security equipment to protect premises. Today, with rapid technology evolve, many users shift from hardwired alarm to wireless alarm. It seems home security industry is moving from hardwired to wireless, but as one of mature and stable alarm equipment, some users still favor the hard wired alarm system. In this article, we will show you some basic information about advantages and disadvantages of hardwired alarm systems.

What s hardwired alarm system ?

Alarm ....etc

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