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...
