can gsm modem make a call?

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pratti

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i want to do home automation.i want to make a system which can make call to user in case of emergency like fire.and the voice to be used in the call should be stored in the micrcontroller.how can this be possible by gsm modem?how to proceed to achive this concept.
 

You can make call with gsm modem.
the voice to be used in the call should be stored in the micrcontroller
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You can't store voice in microcontroller, but there are chips which can store and play voice.
 

i want to make call through gsm modem and when the receiver receives the call then play the recorded voice like"fire fire fire".so how to make this system possible through calling in mobile phone?
 

As I already mentioned it can be done using MCU, SIM900 and APR33A3-C2 IC. APR33A3-C2 can store 8 voice messages and it can be played using micro. It can also be connected to SIM900 GPIOs and controlled by sending GPIO control commands from MCU to SIM900. I can write the code for it. You can contact me regarding the project at internetuser2k11(at)gmail(dot)com
 

i see the datasheet of APR33A3-C2 but i get confused how to make connection with SIM900.can u simple say me about its circuit diagram.
 

In the datasheet of APR33A3-C2 it shows trigger pins connected to buttons. Instead of connecting to buttons, connect it to MCU digital output pins or to SIM900 GPIO pins. If SIM900 is used to trigger the messages then you need to send GPIO control AT commands from MCU to SIM900 using UART.
 

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