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

 

Talk about covering all bases???
Max.

 

Could I ask where you purchased the HT12E/D chips?
thank you
Mike

 

Could I ask where you purchased the HT12E/D chips?
thank you
Mike

http://robokitsworld.com/index.php?main_page=index&cPath=7_89

 

Hello,
better to use 5V suppply at 1.1mhom and 51kohms oscillator Resistor