HT12E and HT12D remote control

Discussion in 'Wireless & RF Design' started by Joshff91, Feb 14, 2015.

  1. Joshff91

    Thread Starter New Member

    Feb 14, 2015
    2
    0
    Hi

    I cant get the Data LED's, at the decoder, to respond to my input from the encoder, any ideas? thanks. Pictures underneath...

    I have recently purchased a few HT12E and HT12D ICs. i made a remote circuit using - letslearnelectronics.blogspot.in/2012/07/introduction-to-encoding-and-decoding_1610.html?view=sidebar

    I have also been using holtek data sheets
    HT12E - holtek.com/pdf/consumer/2_12ev120.pdf
    HT12D - holtek.com/pdf/consumer/2_12dv120.pdf

    I can get the valid transmission (VT) LED to energise and de-energise using a switch @ the TE pin on the encoder side of the circuit, or i can get it to permanently energise by connecting the TE pin to ground (active low) - this works as expected from reading both data sheets. However i cannot get the four LED's which are connected to the decoders data line to respond to the input from the encoder. They are permanently on. I have looked at many versions of this circuit online and they all seem to be the same. They all reccomend using switches on the data input @ the encoder.

    Like i said all 4 of my leds stay energised....

    Any help would be great thanks IMG_16142 copy.jpg IMG_16141 copy.jpg circuit diagram (1) copy.jpg
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,570
    2,381
    Talk about covering all bases???:(
    Max.
     
  3. mkjohnson52

    New Member

    Jan 27, 2013
    1
    0
    Could I ask where you purchased the HT12E/D chips?
    thank you
    Mike
     
  4. Joshff91

    Thread Starter New Member

    Feb 14, 2015
    2
    0
  5. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
    2,831
    89
    Hello,
    better to use 5V suppply at 1.1mhom and 51kohms oscillator Resistor
     
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