Hi,
how to test the HT12E/HT12D ICs ; and Rx/Tx 433 MHz RF Module.
as i have constructed one ckt with this IC's and RF Module pl help

 

what type of antenna for the Rx/Tx 433 RF Module to be use in the ckt. for 30-50 Mts. of distance

 

I think this should be asked in the Radio & communication forum or general electronics chat, isn't it?

 

I doubt this is the right place for this question!! General electronics chat and radio/communication forum may be very helpful...

 

Post the complete circuit diagram of what you have built.

 

What module are you using?

The antenna could be a monopole, length 17cm.

 

What application are you using these modules for? Circuit diagram would be helpful

 

hi
thanks
the following are the ckt. of the project ie. Wireless Water Level Indicator
which I have constructed on the S/L bread board the photo of the same is here

 

the pdf of the ckt

 

I think this should be asked in the Radio & communication forum or general electronics chat, isn't it?

thanks u r right
pl help me to transfer the same to Radio & Communication

 

What module are you using?

The antenna could be a monopole, length 17cm.

RF tx/rx-433
with ht12d/e

 

Hi,
how to test the HT12E/HT12D ICs ; and Rx/Tx 433 MHz RF Module.
as i have constructed one ckt with this IC's and RF Module pl help
__________________

what type of antenna for the Rx/Tx 433 RF Module to be use in the ckt. for 30-50 Mts. of distance
__________________


the following are the ckt. of the project ie. Wireless Water Level Indicator
which I have constructed on the S/L bread board the photo of the same is here

 

I doubt this is the right place for this question!! General electronics chat and radio/communication forum may be very helpful...

sir i have posted the same in Radio and Communication
http://forum.allaboutcircuits.com/showthread.php?p=454015#post454015

 

Post the complete circuit diagram of what you have built.

http://forum.allaboutcircuits.com/showthread.php?p=454015#post454015

 

pl help
sos
sos
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sossssssssssssssssssssssssssssssssssssssssssss

 

Hello,

RF and a breadboard are a bad combination.
The capacitance of the connection strips inside the breadboard will destroy the RF performance.

Bertus

 

hello,

rf and a breadboard are a bad combination.
The capacitance of the connection strips inside the breadboard will destroy the rf performance.

Bertus

thanks
i am soldering it and will see the result

 

Hello,

RF and a breadboard are a bad combination.

In general, yes.

On the other hand, all RF circuitry is already on the transmitter module. The breadboard shouln't be the problem, unless something is wired the wrong way.

@mkbutan

Looking at your transmitter circuit from post #14, did you check the voltage levels at the digital (!) inputs of the encoder?

What TX module is this again? Is there no enable pin or similar?

What exactly is the circuit not doing?

 

In general, yes.

On the other hand, all RF circuitry is already on the transmitter module. The breadboard shouln't be the problem, unless something is wired the wrong way.

@mkbutan

Looking at your transmitter circuit from post #14, did you check the voltage levels at the digital (!) inputs of the encoder?

What TX module is this again? Is there no enable pin or similar?

What exactly is the circuit not doing?

sir,
as Mr.bertus said i have dis assembled the ckt.
but as u can see the ckt. it was not transmitting the data to the μcontroller board i.e.- P89V51RD2 and was not displaying anything on the LCD.
can u guide me its my first project with RF and μcontroller
thanks

 

Did you check if the data at the outputs of the HT12D are the same as at the inputs of the HT12E?

You have to separate the circuit into groups.

First check if the input signals to the encoder are ok. Then check the signal to the transmitter module. Assuming that the transmitter/receiver modules are working (something you would need some more sophisticated instruments to to check) then check the signal out of the receiver module. Then the data out of the decoder.

Troubleshooting is done in steps and dividing a circuit in to smaller subcircuits, each of them needs to be checked individually.

Do you have an oscillsocope?