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Thread: Telephone controlled Remote switch (AT89C2051)

  1. 02-06-2007 02:16 PM #1
    Binu
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    Default Telephone controlled Remote switch (AT89C2051)

    This Project is used to control our household electrical devices from any where through the cell phone. The circuit consists of a DTMF tone detector and a powerful 8 bit Microcontroller AT89S52. The microcontroller controls all the system. In this project we control total six devices.
    The Microcontroller senses the DTMF signal through the DTMF decoder IC MT8870 and it switch on/off the corresponding devices according to the user need. The circuit has an inbuilt phone ring sensor circuit and the system will take over the phone control if it was not taken manually.Press the corresponding numbers to turn on/off the devices, for ex: press 1 to turn on/off device 1, press 0 to switch off all devices, press 9 to switch on all devices, press 8 to disconnect the telephone.
    Program: tele.zip

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  2. 01-09-2007 03:37 PM #2
    rama123
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    how the microcotroller understand the command such as i am giving a number 1 and it switch on the devices with the help of the phone because when we ring the phone the microconyroller only tap the phone and how i give him acommand?

    hello
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  3. 02-09-2007 11:57 AM #3
    Binu
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    when you ring from another phone the microcontroller will automatically take the phone and you should dial the number to control the device. if you dial 1 from the phone then the microcontroller wil switch on the first device. like this all the devices can be controlled.

    J.Binu
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  4. 22-09-2007 04:13 PM #4
    PIDEER
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    Does this project have a PCB??
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  5. 22-09-2007 05:07 PM #5
    Binu
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    Yes, I will post here soon.

    J.Binu
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  6. 26-09-2007 07:03 PM #6
    PIDEER
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    ok..kindly do so,it will help us a lot
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  7. 26-09-2007 07:34 PM #7
    Binu
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    You can now download the PCB from the projects page.

    J.Binu
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  8. 27-09-2007 05:17 AM #8
    PIDEER
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    there is one m ore doubt in your project.Regarding the coding.What is the INCLUDE reg_52.pdf(i know it is regarding 8052,but what is its use???), and where can i get it??thanx for all your help
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  9. 27-09-2007 05:39 AM #9
    PIDEER
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    Also, we were not able to get MT8870 DIP, but got CMD 8870.Will there be any difference??
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  10. 27-09-2007 08:36 AM #10
    Binu
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    Include reg_52.pdf is the header file, which have the address of all registers. you can get it from here http://www.8051projects.info/forum/t...p?TOPIC_ID=173

    You can use CMD8870 instead of mt8870.

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