How to test the HT12E/HT12D & Tx/Rx 433 MHz RF Module

Discussion in 'Radio and Communications' started by mkbutan, Jan 23, 2012.

  1. mkbutan

    mkbutan Thread Starter Active Member

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    Hi,
    how to test the HT12E/HT12D ICs ; and Rx/Tx 433 MHz RF Module.
    as i have constructed one ckt with this IC's and RF Module pl help
     
    #1
  2. mkbutan

    mkbutan Thread Starter Active Member

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    what type of antenna for the Rx/Tx 433 RF Module to be use in the ckt. for 30-50 Mts. of distance
     
    #2
  3. Eric007

    Eric007 Active Member

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    I think this should be asked in the Radio & communication forum or general electronics chat, isn't it?
     
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  4. Eric007

    Eric007 Active Member

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    I doubt this is the right place for this question!! General electronics chat and radio/communication forum may be very helpful...
     
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  5. praondevou

    praondevou Well-Known Member

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    Post the complete circuit diagram of what you have built.
     
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  6. praondevou

    praondevou Well-Known Member

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    What module are you using?

    The antenna could be a monopole, length 17cm.
     
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  7. mossman

    mossman Member

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    What application are you using these modules for? Circuit diagram would be helpful
     
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  8. mkbutan

    mkbutan Thread Starter Active Member

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    hi
    thanks
    the following are the ckt. of the project ie. Wireless Water Level Indicator
    which I have constructed on the S/L bread board the photo of the same is here 25012012371.jpg

    25012012373.jpg

    25012012374.jpg

    25012012372.jpg

    25012012375.jpg

    25012012377.jpg
     
    #8
  9. mkbutan

    mkbutan Thread Starter Active Member

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    the pdf of the ckt
     
    #9
  10. mkbutan

    mkbutan Thread Starter Active Member

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    thanks u r right
    pl help me to transfer the same to Radio & Communication
     
    #10
  11. mkbutan

    mkbutan Thread Starter Active Member

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    RF tx/rx-433
    with ht12d/e
     
    #11
  12. mkbutan

    mkbutan Thread Starter Active Member

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    Hi,
    how to test the HT12E/HT12D ICs ; and Rx/Tx 433 MHz RF Module.
    as i have constructed one ckt with this IC's and RF Module pl help
    __________________

    what type of antenna for the Rx/Tx 433 RF Module to be use in the ckt. for 30-50 Mts. of distance
    __________________


    the following are the ckt. of the project ie. Wireless Water Level Indicator
    which I have constructed on the S/L bread board the photo of the same is here
     
    #12
  13. mkbutan

    mkbutan Thread Starter Active Member

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    #13
  14. mkbutan

    mkbutan Thread Starter Active Member

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    #14
  15. mkbutan

    mkbutan Thread Starter Active Member

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    pl help
    sos
    sos
    sos
    sos
    sossssssssssssssssssssssssssssssssssssssssssss
     
    #15
  16. bertus

    bertus Administrator

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    Hello,

    RF and a breadboard are a bad combination.
    The capacitance of the connection strips inside the breadboard will destroy the RF performance.

    Bertus
     
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  17. mkbutan

    mkbutan Thread Starter Active Member

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    thanks
    i am soldering it and will see the result
     
    #17
  18. praondevou

    praondevou Well-Known Member

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    In general, yes.

    On the other hand, all RF circuitry is already on the transmitter module. The breadboard shouln't be the problem, unless something is wired the wrong way.

    @mkbutan

    Looking at your transmitter circuit from post #14, did you check the voltage levels at the digital (!) inputs of the encoder?

    What TX module is this again? Is there no enable pin or similar?

    What exactly is the circuit not doing?
     
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  19. mkbutan

    mkbutan Thread Starter Active Member

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    sir,
    as Mr.bertus said i have dis assembled the ckt.
    but as u can see the ckt. it was not transmitting the data to the μcontroller board i.e.- P89V51RD2 and was not displaying anything on the LCD.
    can u guide me its my first project with RF and μcontroller
    thanks
     
    #19
  20. praondevou

    praondevou Well-Known Member

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    Did you check if the data at the outputs of the HT12D are the same as at the inputs of the HT12E?

    You have to separate the circuit into groups.

    First check if the input signals to the encoder are ok. Then check the signal to the transmitter module. Assuming that the transmitter/receiver modules are working (something you would need some more sophisticated instruments to to check) then check the signal out of the receiver module. Then the data out of the decoder.

    Troubleshooting is done in steps and dividing a circuit in to smaller subcircuits, each of them needs to be checked individually.

    Do you have an oscillsocope?
     
    #20
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