gps module interfacing with 8051 assembly code
#1

Can some one guide me about commands for GPS module in assembly language for interfacing it with 8051 micor controllers
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#2

GPS has become an efficient tool in the field of scientific use, commerce, surveillance and tracking. A GPS module (Global Positioning System) is a device that has become an effective tool in the field of surveillance, monitoring and scientific use. The GPS module is based on satellite navigation technology that provides time and location information in all weather conditions anywhere in the world. The main purpose of the GPS system is to find out the location of a person or vehicle. A GPS receiver provides an exact location of an object in terms of length and latitude and also provides reliable synchronization, positioning and navigation services to users anywhere and anytime on earth.


GPS interface with 8051 microcontroller:

Below is the block diagram of the GPS interface with the 8051 microcontroller. It consists of GPS modules, MAX 232, 8051 microcontroller, and an LCD display.

[Image: 8-21-2014-10-53-54-AM-300x125.jpg]

The MAX232 is an integrated circuit that is used to convert logical levels of transistor (TTL) to logical levels RS232 through serial communication of ATmels microcontrollers with a PC. The controller operates at the TTL 0-5V logic level. But, USART serial communication with PC works with RS232 standards (-2.5V to + 2.5V). This makes it difficult to find a direct link to communicate with each other.

The AT89C51 microcontroller is an 8-bit microcontroller that belongs to the Atmel 8051 family. It has 4KB PEROM flash (programmable and erasable read memory and 128 bytes of RAM) that can be programmed and erased too many times.

A 16 × 2 LCD is an electronic display, which is very commonly used in many devices and circuits. These screens are preferred to 7 segment screens.

The operating principle of the GPS module is, it always transmits data in series in the form of phrases. The length and latitude values of the location are found in the sentence. To communicate through USART or UART you only need three basic signals: TXD, RXD and GND - so you can UART interface with 8051 microcontroller.

The main intention here is to find the exact location of the GPS receiver in terms of length and latitude. The GPS module provides the output data in RS232 logic level format. To convert the RS232 format to TTL format, a MAX232 line converter is used. It is connected between the GPS module and the AT89C51 microcontroller. The GPS connection with the 8051 connection block diagram is shown in the diagram above. The location values have been displayed on an LCD screen which is connected to the microcontroller.
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