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GSM Module and RF Receiver together with single ATMEGA8

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dpksign

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HELLO guys


i want to make wireless burglar alarm system using PIR sensor .

this system consist following part :

1. Transmitter with PIR sensor
Transmitter circuit consist atmega8 and PIR sensor and 434Mhz Transmitter. When PIR sensor detect any human motion it send the signal to receiver side.

2 . Receiver with Hooter
it consist atmega8 , relay ,hooter and RF 434Mhz Receiver. It also consist GSM MODULE WHICH make call when hooter start ringing.But here i am got stuck . Gsm is not working .

I attached only Tx pin of atmega8 to RX pin of GSM . Rx of MCu is connected with 434Mhz receiver.

so anybody know what is the key problem in it .. ???
 

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