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SMS CONTROLLER WITH WAVECOM MODEM----PLS HELP

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mushu_mist

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Dear all,

I making one project which will send SMS if any sensor is triggered & Switch some device on/off if I send SMS to the MODEM. I am using Wavecom FASTRACK SUPREME 10,WM22221 Modem with ATMEGA 32 AVR micro controller. Now I am facing the problem while making Hardware. I doudts are,
1. Do I need any RS232 Converter in between Modem & Microcontroller?
2. What should be the connection diagram for Microcontroller to MODEM?
3. What is the pin Assignment for the output data pin of the said MODEM?

I am totally confused.Please help me if you have any Idea. Any help will be appriciated.

Regards

MUSHFIQUE
 

For the first point you need a Max 232.

For the second point

Rx microcontroller<-----pin (12) Max 232 (13)pin<----Tx Modem
Tx microcontroller----->pin (11) Max 232 (14)pin---->Rx Modem

Also see Max232, modem and microcontroller datasheets.
 

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