RF module wireless data transmission without encoder and decoder using 8051.

[nancy]

I’m working on a project of wireless data transmission using RF 434 MHz Module and i’ve not used encoder or decoder. I’m not able to recieve data .What should I do?

Can anyone plz tell me the connections of Encoder,Decoder with microcontroller and RF module and also its programming in C??

PLz help me,its urgent.

[D.V.G. Krishna]

have you checked the  tranmit enable pin low in ht12e ic

 

you can refer EG lab circuits

[Dexter]

RF    TX AND RX circuit working module wysiwyg_imageupload:3273:

 

 

wysiwyg_imageupload:3275:

this may help u

[milan]

i m tring to use rf module with encoder decoer, bt the 12e and 12d directly not working and transmitter receiver are also not working, what  should the problem????

[AJISH ALFRED]

 

Hi all,

If you are not specific on data encription and decreption, there is a simple method for rf communication.

Just connect the datain pin of rf transmitter module to the tx pin of uart. Set the baud rate at 1200 kbps and send data. In receiver side you can connect the dataout pin of rf receiver to the rx pin of uart.

No need for encoder and decoder ICs unless you are using more than one transmitters or receivers.

[Anonymous]

wats the use of 0.01uf capacitor between vcc and ground in circuit for decoder.

[Amrith]

0.01uf  capacitor used in the circuit is called as decoupling capacitor.

[Amrith]

Hi mililan,

There is a procedure to send data using HT12E encoder, before you press any data switch at HT12E you must first press transmission enable pin(TE) & the press data switch.

[D.V.G. Krishna]

some body told me to use very less baud rate like 1200,600,300

 

and the data transmission must me continious so 

 

trnsmit some predefined data.like 10101010 or 11001100 as your wish

 

so by default the SBUF is loadded with this default data

 

and load some specified data as per the events

 

that main logic is the signal transmission should not be broken

 

but i preffer to go for serial trancevers which do not need any encoders or decoders 

[Amrith]

Hi,

Setting lower baud rates does not solve the issues using Tx & Rx modules without encoder & decoder. Lot of care has to be taken care while writing code.

[AJISH ALFRED]

 

Hi Milan,

Make sure that you’ve done the following,

1) Pull up the address bit of both encoder and decoder

2) Pull up the data bits also

It may work some people eventhough without it, but somehow!!

3) Make sure the each address bits are at the same voltage (logic 0 or 1) on both encoder and decoder.

 

Also keep in mind that your module can transmit data atmost 3kbps only.

[srinivas sr]

hey guys im interfacing RF 434 module with atmega32.. can we interface it without using encoder and decoder

[Narendra kumar.U.M]

hi …

this is narendra 

I needed to interface RFmodules with 89s51, and i need to check rf modules without serial communication….is it possible or not………….please reply me

 

[rahul]

can send me code and circuit diagram as early as possible plz.

[sukhman]

ello
I got the circuit of rf robot car ,it used 20 pin at89c51 , but I want to use 40 pin 8051, please tell how to do it

[Author]

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