Teensy 4.1 for Multiple Wiegand Door Access System

O

onlinegill

New member
Hi everyone,

I'm currently running a Wiegand rfid door access control system with my Arduino Mega, but I've hit the limits of what I can do with the available pins. I'm considering upgrading to a Teensy 4.1 to expand my system.

Each door in my setup requires 3 pins (2 for Wiegand RFID reader - D0 & D1, plus 1 for the relay). I need to add several more doors.

Has anyone used the Teensy 4.1 for this kind of application? How many doors could I realistically control with it? Any insight on pin assignments or limitations I should be aware of when working with multiple Wiegand readers?

Thanks in advance for your expertise!
 
Be aware that the I/O pins on the Teensy 4 .1 are NOT 5V compatible and MUST operate at 3.3V.
Putting 5V on any Teensy pin will likely KILL that pin and potentially the Teensy as well.

It might help if you stated which Wiegand rfid you are using and your circuit for driving the relay(s).
 
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