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How to control a Dish antenna from a remote area

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documents in English
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term papers
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25 pages
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Expert
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  1. Abstract
  2. Overview
  3. Block diagram
    1. Transmitter part
    2. Receiver part
    3. Circuit diagram and description
  4. Embedded system introduction
  5. Component description
    1. Micro controller
    2. RF modules
    3. Line driver
    4. Stepper motor
    5. LCD
    6. Power supply
  6. Keil software
    1. Code description
  7. Source coding
  8. Conclusion
  9. Bibliography

The development of this Remote Controlled Dish Antenna application requires the configuration of the micro controller architecture, writing (code) and debugging of the application program. In this application the status of the dish antenna such as direction, angle will be controlled by the user remotely by using a remote control which has an LCD in which the direction and angle of the dish antenna are displayed this will help the user to know direction and angle.

This is a project on a remote controlled dish antenna which is used for controlling the dish antennas from remote locations. The over view of this project is as follows. RF signals are sent through the RF encoder. This encoder encodes the given RF sequence and sends it to the RF transmitting module. The transmitted sequence is passed through one antenna and goes to the receiving antenna. This process done by the transmitting unit.

At the receiving part the RF receiver module receives the RF signals and gives it to the decoder. The decoder decodes the information and gives it to port2 of the micro controller. The micro controller executes both hardware and software instructions in clock wise and anti clock wise directions. Then port1 of the micro controller is connected to the line driver which is used for the providing external support to the stepper motor. By using this stepper motor action the antenna is rotated in a particular direction. All these are connected to the power supply unit.

[...] When using a wireless remote control system it is desirable to have a way of filtering out or ignoring those unwanted signals to prevent false data from being received. A simple way to accomplish this is to use an encoder IC at the transmitter and a decoder IC at the receiver. The encoder generates serial codes that are automatically sent three times and must be received at least twice before data is accepted as valid by the decoder circuit. General description: The to the power decoders are a series of CMOS LSIs for remote control system applications. [...]


[...] Practical Bipolar Drive Circuits There are a number of integrated H-bridge drivers on the market, but it is still useful to look at discrete component implementations for an understanding of how an H-bridge works. Antonio Repose (ajr@cybill.inesc.pt) suggested the H-bridge circuit shown in Figure Fig s:ckt diagram of Bipolar Stepper Motor The X and Y inputs to this circuit can be driven by open collector TTL outputs as in the darlington-based unipolar drive circuit in Figure The motor winding will be energized if exactly one of the X and Y inputs is high and exactly one of them is low. [...]


[...] Frequency modulation causes the instantaneous frequency of a sine wave carrier to depart from the center frequency by an amount proportional to the instantaneous value of the modulating signal. Amplitude shift key (ASK) transmits data by varying the amplitude of the transmitted signal. Frequency shift key (FSK) is a digital modulation scheme using two or more output frequencies. Phase shift key (PSK) is a digital modulation scheme in which the phase of the transmitted signal is varied in accordance with the base band data signal. [...]

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