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HT12E and HT12D Problem


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Abhinav.Chaurey

Tue Feb 09 2010, 12:36AM

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Hello all,

i am building two remote control sets one for my room appliances and second for my rover. I am using HT12E and HT12D with 315 Mhz RF modules. now i am in big problem. When i use one pair of Rx and TX at one time then they work well , but when i turn on one Rx and two Tx the Rx stops receiving signals and VT LED turns off. i am using different addresses for both Tx.

Please help to solve my problem.

Thank you

Abhinav.Chaurey

Tue Feb 09 2010, 08:29AM

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Someone please help.

Ajay Bhargav

Tue Feb 09 2010, 11:40AM

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are you sending data from both tx at same time?

are they capable of handling collision?

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Abhinav.Chaurey

Tue Feb 09 2010, 11:44AM

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hi ajay thanks for reply
yes i am sending data from both Tx at same time.
how to know that Rx is capable of handling collision?

Abhinav.Chaurey

Wed Feb 10 2010, 08:22AM

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Please some one help me

DavesGarage

Wed Feb 10 2010, 09:56AM

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From what I can gleen from the datasheets, the ROSC resistor sets the communication frequency for the encoder. Are you using the same resistor for both transmitters? If so, you probably are confusing the decoder, since it would be reading from both transmitters at the same time.

Try changing the ROSC for a pair of encoder/decoder to a different value - Remember to keep the same ROSC for the pair, just different than the other pair.

Now the decoder is matched to its encoder, and hopefully will not try and read when the other pair's transmitter is transmitting...

-Dave
"Basic research is what I am doing when I don't know what I am doing"