How to connect gsm modem sim300

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chandankumar1331

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Referring to old thread https://www.edaboard.com/threads/199301/
avrsanju said:
hai all,gsm modem sim300+pic without max232...(iam using 3.7 volt cellphone battery for pic and modem.) can i communicate properley with modem and viceversa?.i do not interested to use max 232,advice me pls.:!:
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hi i am building GSM sim 300 module for my my project .but i dun have any schematic and circuit diagram . can you help me .
thanks
 
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If your SIM300 has TTL (5V type) pins for Rx and Tx then cross connect that is

SIM300 Tx > PIC Rx
SIM300 Rx > PIC Tx
SIM300 GND to PIC GND

(PIC should be 5V type).

If your SIM300 doesn't have TTL UART pins but have RS232 port (DB9 connector) then put a MAX232 between PIC and DB9 connector of SIM300.

If you need any help in coding then mention it.
 

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