[AVR] gsm interfacing problem

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balvendrajat

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how can i interface gsm sim300/sim900 with atmega16 out of these please tell me detail
1 direct connection of Rx Tx and GND.
2 using max232.
4 using a voltage divider circuit.
please give me detail of all these method
 

there is no need of max232 you can connect your module TX pin to atmega 16 RX pin and module RX pin to atmega 16 TX pin and GND to GND pin connection will do your work

and please search before posting this question answered so many time in this forum
 
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if i directly connect tx pin of mcu to Rx pin of module then there will a chance of damage of module so please give me a resistor divider circuit
 

balvendrajat said:
if i directly connect tx pin of mcu to Rx pin of module then there will a chance of damage of module so please give me a resistor divider circuit
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please refer the sim300 user manual and no chance to damage of module you can use direct connection..
 

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