Hi there, I'm fairly new to hardware, but good as a programer.
I'm trying to make a "rfid multiple door controller".
Currently I've achieved to read an rfid chip trough UART (serial input) on the raspberry.
Also I'm able to lock/unlock doors.
The problem is how to add 2 and more rfid readers?
Since the rfid reader is communicating with the PI trough a Serial port, I need to have a multiple serial ports.
I've searched hours of how to do this, and couldn't find a simple solution.
In this topic for example there are 3 solutions barely described.
http://www.raspberrypi.org/phpBB3/viewt ... ut#p451200
Can anyone describe me some of these in details (how to connect, are there any libraries to use), or propose different solution???
I'm aiming to do the task at the lowest cost possible, but if there is way simpler solution for a reasonable price it is ok.
Hope someone can help