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You are here: Home / Topics / Use of MAX232 IC

Use of MAX232 IC

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Microcontroller › PIC › Use of MAX232 IC

  • This topic has 2 replies, 3 voices, and was last updated 13 years, 8 months ago by Aviral Sharma.
Viewing 3 posts - 1 through 3 (of 3 total)
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  • October 1, 2011 at 6:28 am #1287
    Jaden Ng
    Participant

    Hi,

     

    I just read 2 of the articles

    http://www.engineersgarage.com/embedded/pic-microcontroller-projects/rfid-interfacing-circuit-code

    http://www.engineersgarage.com/microcontroller/8051projects/interface-rfid-AT89C51-circuit

     

     

    I’m abit confused with why the pic18 dont need a max232 IC when rfid communicate with controller but why the AT89c51 need a max232 ic.what is TTL btw?

    October 8, 2011 at 4:27 am #6685
    nikhiljain
    Participant

    very good question Jaden. If you’ll look at the Images of both the projects on their first page, you’ll notice that in case of AT89C51, the RFID reader is mounted on a PCB which itself contains a MAX232 and converts TTL to RS232 logic. While in case of PIC18, the RFID reader is directly connected to the microcontroller on the breadboard and gives TTL logic straight away.

    In case of AT89C51:

    [RFID Reader (TTL) –> MAX232(RS232)] –> MAX232(TTL) –> Microcontroller

     

    In case of PIC18:

    [RFID Reader(TTL)] –> Microcontroller

     

    The Square bracket represents RFID Module in both the cases. So you can use either of the configuration in any of the case, only thing you need to take care is that you provide TTL logic to the controller.

    October 8, 2011 at 10:35 am #6686
    Aviral Sharma
    Participant

    thanks for the explanation nikhiljain.

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