HT12E and FM Transmitter

[Noer Bany Yusuf]

Thanks for all the answers, among the gentlemen of all if anyone has the electronic circuit of the data transmitter and receiver? I really needed to be used in IC HT12E and HT12D. frequency around 27Mhz like a remote control toy car. thank's before.

---------- Post added at 22:22 ---------- Previous post was at 22:16 ----------

in addition to electronic circuits if there are any other electronic circuit that includes only transmitter and receiver only? (For use in HT12E ic and HT12D.)

 

[Noer Bany Yusuf]

Re: ht12d

Hi All,

I want to make IR Remote Control Transmission and
Reception System with HOLTEK HT12D and HT12E ENCODER and Decoder IC's.

I am downloaded Data sheet of Both Components and read datasheets.

Do I Need any Amplification at Transimitter Side or 555 Timer???

Please guide me.


Karan

I think you need 38Khz generator of 555 ic. see the electronic circuitry on the following web pages.

**broken link removed**.


good luck.:grin:

 

[jasper20]

hello.. u have said that v can use the encoder ic for transmission.can u say the pin details of this ic connection with max232.i.e which pin of the max232 has to be connected to which pin of the encoder ic

 

[deepakrajchris]

Re: RF module with HT12D/HT12E

How to calculate the value of Rosc . . .Is there an formula for That???

 

[ckshivaram]

see the data sheet of the decoder and encoder, while explaining the graph they have explained about Rosc.

 

[ghvharish]

see the data sheet of the decoder and encoder, while explaining the graph they have explained about Rosc.

in ht12e
for the pins 15 and 16 i had applied 75k
does my ic works??

- - - Updated - - -

ie for oscillator pins

 

[Krishna Patil]

Typical Bitrate of HT12E is 1kbps so bandwidth for ASK is 2*Bit rate which is 2KHz. But it is mentioned in data sheet as 2Mhz?

I'm using a 433 Mhz Tx/Rx Pair for RF Communication. Typically we use 1Mohm as Rosc ? can I use a 10M ohm resistor to reduce fosc and get a lower data rate which reduces bandwidth and increases receiver sensitivity which ultimately increases range of RF transmission ?

Also can I use Rosc below 470k so that I get a faster transmission in the short range ? Since RF transmitter supports data rate upto 9.6kbps . So fosc can be 28.8Khz

Can I get a graph of how data rate supported decreases with distance ? Is it possible to calculate by experimentation?