gps v
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Transcript of gps v
230 to 12 VStep Down Transformer
AT89S52µc
MAX232
GSM Modem GPS Modem
16x2 LCD Display
Relay
Block Diagram:
Transformer(12-0-12)V :i) Step
down ii) 0-9V
with 500mARectifier:
=> Bridge Rectifier => Bidirectional to unidirectional
Features:o Compatibility with the MCS 51 familyo 8-bit CPU frequency up to 33MHz;o RAM: 256 Byteso Flash memory: 8K Byteso 3 timers / counters of 16 bits;o Two data pointerso 1 serial port (full duplex UART)o supports up to 10 000 rewriteso contains the oscillator;o Short programming time.
Þ To Find location by using Latitude and Longitude data
Why we use GPS ?
Features of GPS: 24 Satellites at different orbits
Revolve around Earth twice a day
For a 2D location, 3 GPS Satellites are used
For a 3D location, more than 3 Satellites are used
A GPS Signal contains three different bits of information
(1).Pseudo random code
(2).Ephemeris data
(3).Almanac data
THE SIGNAL
BASIC CONCEPTS OF GPS Receivers require clear line-of-sight; thus, they will not work indoors or
where tall objects obscure the sky
IC MAX232:
• MAX232 IC is used to convert the TTL/CMOS logic levels to RS232 logic levels during serial communication of microcontrollers with PC
• The controller operates at TTL logic level (0-5V)
• whereas the serial communication in PC works on RS232 standards (-25 V to + 25V)
APPLICATIONS: Stolen vehicle recovery . Field service management. It is used for food delivery and car rental companies.
ADVANTAGES: It provides more security than other system. From the remote place we can access the system.