infra red transmission problem

[carl]

Hi,

Im doing my project, trying to send a signal from the "HT12E encoder" to a
"HT12D decoder" ........... The problem is that i've been told that the
oscillator frequency on the transmitter and the receiver needs to be the
same is this true!? i have had a look at the data sheets and it dosen't
seem possible am i missing something??

Any advice on this subject would be a good help thanks, this is my first
time constructing something practical from the theory that i have learnt and
it is proving challenging in a good way though....

 

[Tim Dicus]

"carl" <carlosthejackle2001@yahoo.co.uk> wrote in message news:c0gpk7$ehv$1@hercules.btinternet.com...

Hi,

Im doing my project, trying to send a signal from the "HT12E encoder" to a
"HT12D decoder" ........... The problem is that i've been told that the
oscillator frequency on the transmitter and the receiver needs to be the
same is this true!? i have had a look at the data sheets and it dosen't
seem possible am i missing something??

Any advice on this subject would be a good help thanks, this is my first
time constructing something practical from the theory that i have learnt and
it is proving challenging in a good way though....

According to the Holtek datasheets and faq, the frequencies are different. The transmitter (HT12E encoder) should have a frequency
50 times that of the receiver (HT12D decoder).

References:
http://www.holtek.com/pdf/consumer/2_12d.pdf
http://www.holtek.com/pdf/consumer/2_12e.pdf
http://www.holtek.com/tech/faq/212_faq.htm

Hope that helps.

Tim