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 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. [...]
[...] In this application RF Transmitter and Receiver are used as a remote for controlling the dish antenna direction/angle. For this three tactile switches are used. Switch 1 is for clockwise direction, switch 2 is for anti-clockwise direction and switch 3 is for idle position. One pin of these switches are connected to the encoder IC (HT640) data lines AD10 to AD12 respectively and other pin of the switches are connected to the +5V point. And TE pin is connected to +5V through 10K resistor for enabling the transmitter. [...]
[...] The Atmel AT89C52 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications Features The AT89C52 provides the following standard features: Compatible with MCS-51 Products Endurance: 1,000 Write/Erase Cycles 8K Bytes of In-System Reprogrammable Flash Memory 128 bytes of Internal RAM (128 x 8-bit) 32 Programmable I/O Lines Two 16-bit Timer/Counters Five vector two-level interrupt architecture A full duplex serial port Three-level Program Memory Lock Six Interrupt Sources On-chip oscillator and clock circuitry PIN DIAGRAM: Fig f : pin diagram of AT89C52 Pin Description VCC Supply voltage. [...]
[...] The 78xx series of regulators is designed to work in complement with the 79xx series of negative voltage regulators in systems that provide both positive and negative regulated voltages, since the 78xx series can't regulate negative voltages in such a system. The 7805 & 7812 is one of the most common and well-known of the 78xx series regulators, as its small component count and medium-power regulated 5V make it useful for powering TTL devices. Table 5:Specifications for different IC`s 6. [...]
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