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Joined: Feb 2011
25-02-2011, 11:40 AM

.docx   MOBILE CAR_FULL REPORT.docx (Size: 1.71 MB / Downloads: 93)
Productivity is the talk of the hour. With increased demand for any product at affordable prices and of required functions and qualities it is absolutely essential to use modern technologies. Unless one adopts the modern trends and technologies it is not very sure that one can be safe in all walks of life.
In our project and implimentation we are using the PIC micro-controller. The controller provides the following standard features: 4K bytes of Flash memory, 128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, five vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator and clock circuitry. In addition, the microcontroller is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes

Unlike the above conventional methods our mobile control vehicle is an easily installable, economically viable of material trace system. This project and implimentation is used to Micro control the car action through mobile phone. Usually, the car actions are being controlled using switches without using remote. By using remote process also, we can control the car actions (i.e.) we can control the car operations in the sited place while the actions are anywhere. In this project and implimentation very helpful in the important sections of large and small industries, hospitals, airports, railway station, bus stand etc.
In order to control any load the user has to press the buttons of the remote mobile phone or a land line phone. The mobile phone or the land line phone produces a distinct tone for every key pressed on the numeric key pad.
The tones produces by the numeric keypad reaches the other end or the load end and there we need binary 4 bit word for every tone transmitted by the calling telephone. Therefore we use the 8870 tone decoder at the receiving end. The function of the tone decoder is to decode the tones and supply a 4 bit word for every key pressed.
In general, a tone decoder is an electronic unit that gives a code in the desired form correspondingly in response to a tone supplied. Application of different tones causes different output patterns of codes.
In our project and implimentation we have used the tone decoder IC MM8870. This tone decoder is called the DTMF tone decoder. This tone decoder can give a 4 bit output and the output bit pattern can assume 12 different combinations corresponding to 12 different tones applied as input.
In tone decoding circuit, the tone received through the telephone lines is decoded ie. the tone received is converted into binary form. For this purpose IC 8870 is used. The tone received is applied to pin no.3 of IC 8870 and the binary output is obtained from the pins 11 to 15. The decoder uses digital counting techniques to detect and decodes all tone pairs into a 4-bit code.
The IC8870 consists of a band split filter section, which separates the high and low group tones, followed by a digital counting section, which verifies the frequency and duration of the received tones before passing the corresponding code to the output bus.
This binary signal is temporarily stored in the buffer. The buffer is used to store the binary signal temporarily. The output of buffer is applied to the microcontroller. The micro controller produces the output signal depending upon the its internal programming.
The output signal of micro controller is very low range. To amplify this signals the driver is used. The driver amplifies its voltage and current gain to the required level in order to drive the relay. In the relay the motor is connected the motor will run depending upon the coil energization and tripping of the relay.
Printed circuit board

A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components using conductive pathways, tracks or signal traces etched from copper sheets laminated onto a non-conductive substrate. It is also referred to as printed wiring board (PWB) or etched wiring board. A PCB populated with electronic components is a printed circuit assembly (PCA), also known as a printed circuit board assembly (PCBA).
PCBs are inexpensive, and can be highly reliable. They require much more layout effort and higher initial cost than either wire-wrapped or point-to-point constructed circuits, but are much cheaper and faster for high-volume production. Much of the electronics industry's PCB design, assembly, and quality control needs are set by standards that are published by the IPC organization.
The PCB manufacturing process is very important for anyone involved in the electronics industry. Printed circuit boards, PCBs, are very widely used as the basis for electronic circuits. Printed circuit boards are used to provide the mechanical basis on which the circuit can be built. Accordingly virtually all circuits use printed circuit boards and they are designed and used in quantities of millions.
Although PCBs form the basis of virtually all electronic circuits today, they tend to be taken for granted. Nevertheless technology in this area of electronics is moving forward. Track sizes are decreasing, the numbers of layers in the boards is increasing to accommodate for the increased connectivity required, and the design rules are being improved to ensure that smaller SMT devices can be handled and the soldering processes used in production can be accommodated.

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