GPS used is Holux M89. connected with Serial port (RX) using Multiplexer (74157). because we need to data from GSM and GPS both at different time intervals.

aruncharyyes, please send such that i can write......can you please provide me your email address so thati can send you the circuit. i am unable to attach a pdf file...

aruncharyyes we can do the interface of GSM and GPS with microcontroller with MAX232 as following circuit.7and 8 pin of MAX are connected to RXD andTXD of GSM respectively ,then...

Hey Dear Friend i have designed this circuit in which i have interfaced GSM Module Sim900D and GPS M89 Module with Atmel 89c51. Can anybdy write code for me?