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Multiple slave devices to one arduino master...

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hey... i am trying to couple few sensors in arduino Uno.. my main aim is to use the lcd 1602 display a message as in "insert ur card".. thn rfid mfrc522 sacns the card.. n displays the message on lcd... also i need to activate the gsm sim900a modem and gps to take the location n speed and keep storing them...
i got success with getting the code individually but when i combine the code...

 

firstly the LCD and RFID when combined togethr only the lcd works and control is not passed to RFID and the same in case of GPS...

 

I have done quite research on this topis as well.. n i hav reached to one thing tht is SPI or I2c.. bt i dnt want to increase anothr hardware by using I2C...
so can i do something with SPI???

 

but even there is dbt with that cz.. SPI requires the ss pin , address of all the slave devices..
but i dont know the slave select pin for lcd , gsm and gps cz there is no CS or SS pin on their hardware... so which pin should i initialise as SS for them??
Can someone help asap... its little urgent as its my final yr projct..
i am attaching the code below fr reference...
Thanks in advance...

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    Hi,

     

    I can see you also have asked in the Arduino forum.

    Which connection have you used to check the modules individually?

    I suppose that the GPS module is serial, probably the GSM will be also available through serial connection, so I recommend you check that both works individually with softserial library instead of using hardware serial, then you can use two serial port, one for each module. The LCD probably is i2C or SPI, so if you use different port for each module, you should have no problem.

     

    Hope that helps

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  • 0

    Hi,

     

    I can see you also have asked in the Arduino forum.

    Which connection have you used to check the modules individually?

    I suppose that the GPS module is serial, probably the GSM will be also available through serial connection, so I recommend you check that both works individually with softserial library instead of using hardware serial, then you can use two serial port, one for each module. The LCD probably is i2C or SPI, so if you use different port for each module, you should have no problem.

     

    Hope that helps

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