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23-02-2011, 12:56 PM

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An object locator is a device designed to assist its user in finding misplaced household and personal objects in a home. We probably spend hours every month looking for items around the home, often in a similar situation. In fact, almost every person in the world suffers this problem. But now this is not really a big problem because now there’s an inexpensive gadget to help people quickly find important items by tagging them and using an RF locator to pinpoint their position in seconds. Advantages of such locators include extensibility and low maintenance.
In the past few decades, an unprecedented demand for wireless technologies has been taking place. Mobiles, Laptops, assistants (PDAs), and mobile phones, to name just a few examples, are becoming part of the everyday life of a growing number of devices that communicate wirelessly. Radio and infrared (IR) are currently the main parts of the electromagnetic spectrum used to transmit information wirelessly. IR is becoming more popular every day and it is being preferred due to its inherent advantages like low power requirements, security, effective short distance communication as compared to its Radio counterpart. So we are using this technology in our project and implimentation.
In this project and implimentation we aim to design and build a hardware model of IR receiver and simple TV remote can be used as the transmitter
"Where did I put my car keys?" is a question that we must have heard many times in our life! How often have you put something down and then spent ages looking for it? Well, our group decided to invent a gadget that would end this frustration!
The idea was to develop small "tags" that could be clipped onto items which are often misplaced. These tags would be designed so that if they received a uniquely coded signal from an IR transmitter, they would emit a bleeping sound. A simple TV remote could be used to do this.
The idea being, if you are looking for an item which has the tag attached, you could go to the transmitter and press the associated button. The transmitter would then send out a coded signal for a specific tag and voila, our item has been located!
An object locator system comprises an activation unit and a remote locator where the remote locator may be attached to an easily misplaced object, such as a key or key-ring. The activation unit comprises additional functionality to induce the operator to carry it routinely so that it might be available at distant sites if needed. In one embodiment, the activation unit comprises a cellular telephone. In another embodiment, the activation unit comprises a wrist watch with an integral transmitter. The activation unit, when triggered, generates an activating signal. The remote locator receives the activating signal and announces its location. Communication from the activation unit to the remote locator may be direct or indirect, and may be via radio frequency electromagnetic, optical, or acoustic means. We can use a simple TV remote as a transmitter
3.1. TIMER IC NE555:
The NE-555 was invented by the Herr. Hans. R. Camenzind in 1970, the NE-555 went on to become a legend in the Electronics industry, the chip possibly deriving its "nick-name" from the three 5K resistors, R7, R8 and R9, all of which form the very unique " five - five - five " resistor combination. The standard NE-555 can be a stand-alone compact device, yet powerful enough to perform basic timing functions or as a versatile timer or even as a simple oscillator to create tones of various pitches up to the ultrasonic’s of 200KHz.
IC NE555:
The 555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays or oscillations.
 Turn off time less than 2μs
 Max operating frequency greater than 500 kHz.
 Output can source and sink currents up to 200 mA.
 Timing from microseconds to hours.
Basic NE-555 One-Shot ( Monostable ) Operation:
A monostable circuit produces a single output pulse when triggered. It is called a monostable because it is stable in just one state: 'output low'. The 'output high' state is temporary.
The duration of the pulse is called the time period (T) and this is determined by resistor R1 and capacitor C1:
Time period, T = 1.1 × R1 × C1
T = time period in seconds (s)
R1 = resistance in ohms ( )
C1 = capacitance in farads (F)
The time period is multiplied by 1.1 because, the capacitor charges to 2/3 = 67% so it is a bit longer than the time constant (R1 × C1) which is the time taken to charge to 63%.
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23-06-2012, 01:51 PM

Can you please tell me the range of the device.
Its efficiency and other related parameters
How often does it require maintenance.


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