GPS and GSM module interface

HARDWARE

HARDWARE

1>STR 912 board

2>ublox lea 5h GPS module

3>SIM 300 gsm module

SOFTWARE

1>eclipse toolchain

2>open OCD

SYSTEM FUNCTION

If the system acknowledge a valid GPS FIX then a SMS is sent to mobile user by the system with GPS module latitude,longitude,time stamp and velocity information.

PROTOCOLS USED

sim 300 =>AT commands

GPS module => NEMA protocol

INTERFACE BETWEEN MODULE'S AND CONTROLLER

 UART => BAUD RATE  = 9600 

         STOP BITS  = 1

         START BITS = 1

         DATA LENGTH  = 8 bits

ALGORITHM

1> When the system starts then the GPS module is turned ON .

2> GPS module is configured to send only latitude,longitude,timestamp and velocity parameters using NEMA protocol.

3> WAIT till you get valid latitude and longitude.

4> Configure SIM300 module in text mode followed by mobile number and SMS containing valid parameters.

5> STOP

ANALOG ADD-ON BOARD

Analog Add-On Board

The Analog add-on board has the following features:

• Temperature Sensor
• Buzzer
• LED array
• DIP switches
• USART
• Anti-Tamper and Wakeup unit

Only the buzzer is used to indicate fall.

The schematic of the add-on board can be found here : File:Analog Schematic.pdf