03-07-2012, 11:53 AM
Matlab Based RF ROBOT
RF Coding Idea
Transmitter Module
Microcontroller: At the transmitter
end we are using PIC16F877A
microcontroller UART block which
communicate to PC serial port. On PC
side software is written in Visual C.
When the on-Off button is pressed on
software running on PC, the base unit
utilizes a microcontroller to output a
software based UART packed bitstream
to the RF transmitter module
the status of transmitter is shown on
PC attached to the transmitter. The
bit-stream consists of a series of high
bits, a low start bit, the eight-bit ID
code, and two high stop bits and RF
Transmitter: The transmitter transmits
the packed bit-stream to all of the
remote units. Figure 1 shows transmitter
section.
DATA EEPROM AND FLASH PROGRAM
MEMORY
The Data EEPROM and FLASH Program
Memory are readable and writable
during normal operation over the
entire VDD range. These operations
take place on a single byte for Data
EEPROM memory and a single word for
Program memory. A write operation
causes an erase-then-write operation
to take place on the specified byte or
word. A bulk erase operation may not
be issued from user code (which
includes removing code protection).
Access to program memory allows for
checksum calculation. The values
written to program memory do not
need to be valid instructions.
Therefore, up to 14-bit numbers can be
stored in memory for use as calibration
parameters, serial numbers,
packed 7-bit ASCII, etc.
Digital Modulation
Using Digital signal processing and
associated technologies, modern
communication systems have robust
operations and better security in
information flow. Security in information
flow is enhanced by the application
of cryptography, spread spectrum,
and other techniques that could
not be easily implemented in analog
Amplitude Shift Keying
Amplitude shift keying is a simple form
of AM that can be achieved by onoff
keying of the carrier frequency, where
on represents binary 1 and off represents
binary 0. Although simple, the
on-off keying method is not normally
used in digital data transmission
because of significant variations in
the signal strength at the receiver.
An ASK data signal is generated by
multiplying the data signal by a carrier.
RF Coding Idea
Transmitter Module
Microcontroller: At the transmitter
end we are using PIC16F877A
microcontroller UART block which
communicate to PC serial port. On PC
side software is written in Visual C.
When the on-Off button is pressed on
software running on PC, the base unit
utilizes a microcontroller to output a
software based UART packed bitstream
to the RF transmitter module
the status of transmitter is shown on
PC attached to the transmitter. The
bit-stream consists of a series of high
bits, a low start bit, the eight-bit ID
code, and two high stop bits and RF
Transmitter: The transmitter transmits
the packed bit-stream to all of the
remote units. Figure 1 shows transmitter
section.
DATA EEPROM AND FLASH PROGRAM
MEMORY
The Data EEPROM and FLASH Program
Memory are readable and writable
during normal operation over the
entire VDD range. These operations
take place on a single byte for Data
EEPROM memory and a single word for
Program memory. A write operation
causes an erase-then-write operation
to take place on the specified byte or
word. A bulk erase operation may not
be issued from user code (which
includes removing code protection).
Access to program memory allows for
checksum calculation. The values
written to program memory do not
need to be valid instructions.
Therefore, up to 14-bit numbers can be
stored in memory for use as calibration
parameters, serial numbers,
packed 7-bit ASCII, etc.
Digital Modulation
Using Digital signal processing and
associated technologies, modern
communication systems have robust
operations and better security in
information flow. Security in information
flow is enhanced by the application
of cryptography, spread spectrum,
and other techniques that could
not be easily implemented in analog
Amplitude Shift Keying
Amplitude shift keying is a simple form
of AM that can be achieved by onoff
keying of the carrier frequency, where
on represents binary 1 and off represents
binary 0. Although simple, the
on-off keying method is not normally
used in digital data transmission
because of significant variations in
the signal strength at the receiver.
An ASK data signal is generated by
multiplying the data signal by a carrier.