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  • Using the Sim900/sim900A mini module with Arduino UNO

    now it's work.. thank you so much for your help. Now arise on more question> is ground of TTL pin should be common with the power supply of GSM module (power jack 5v)?? in other words i just have to connect TTL ground pin with the Arduino ground pin or not? please reply me.. if you don't understand what i ask>then reply me "AGAIN"... but Give me some response. i will be waiting for your response.

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  • Using the Sim900/sim900A mini module with Arduino UNO

    please guide how to use TTL rs232? or do you have other test code for checking GSM module is working properly or not?

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  • Using the Sim900/sim900A mini module with Arduino UNO

    I could not understand , please tell me which one connection is used to interface Ardiuno either RS232 port (which have 3 pins Rx,Tx,Gnd) or Rs232 TTL.Please check my GSM module either it has TTL or not? Link for GSM image.http://www.evselectro.com/gadgets-and-gifts-sim-900d-1905?keyword=gsm&category_id=0Please reply me.

    I could not understand , please tell me which one connection is used to interface Ardiuno either RS232 port (which have 3 pins Rx,Tx,Gnd) or Rs232 TTL.Please check my GSM module either it has TTL or not? Link for GSM image.http://www.evselectro.com/gadgets-and-gifts-sim-900d-1905?keyword=gsm&category_id=0Please reply me.

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  • hidep commented on Erfinden's instructable Interfacing SIM900A GSM Modem with Arduino8 months ago
    Interfacing SIM900A GSM Modem with Arduino

    I tried this code but it’s not working. Might be i have to RS232 with TTL.Please check my GSM module either it has TTL or not? Link for GSM image.http://www.evselectro.com/gadgets-and-gifts-sim-900d-1905?keyword=gsm&category_id=0Please reply me.

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