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…