EM-18 rfid reader and pic micocontroller

Discussion in 'Embedded Systems and Microcontrollers' started by Sajo Joseph, Nov 18, 2014.

  1. Sajo Joseph

    Thread Starter New Member

    Nov 17, 2014
    How to interface em-18 rfid reader module with pic microcontroller ?
  2. Sajo Joseph

    Thread Starter New Member

    Nov 17, 2014
    Does it requires MAX232?
  3. tshuck

    Well-Known Member

    Oct 18, 2012
    This would seem to suggest no, but the sketchy datasheet I found said it outputs RS-232, but this could well be from confusion between RS-232 and UART...

    Edit: this link seems a little more legitimate, I'd think it works on UART logic levels (especially since it works on 5V).
    Sajo Joseph likes this.
  4. ligo.george

    New Member

    Feb 2, 2013
    You don't want to use MAX232.
    EM-18 RFID reader works on 5V and I hope that you are using a 5V pic microcontroller. If so you can connect TX of EM-18 directly to RX of PIC.
    If you are using a 3.3V PIC, you should add additional voltage divider resistor to reduce 5V to 3.3V.
    Try the following link, it might help you.
    Interfacing EM-18 RFID Reader Module with PIC Microcontroller
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