How to test the HT12E/HT12D & Tx/Rx 433 MHz RF Module

Thread Starter

mkbutan

Joined Sep 30, 2008
277
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
 

Thread Starter

mkbutan

Joined Sep 30, 2008
277
what type of antenna for the Rx/Tx 433 RF Module to be use in the ckt. for 30-50 Mts. of distance
 

Eric007

Joined Aug 5, 2011
1,154
I think this should be asked in the Radio & communication forum or general electronics chat, isn't it?
 

Eric007

Joined Aug 5, 2011
1,154
I doubt this is the right place for this question!! General electronics chat and radio/communication forum may be very helpful...
 

Thread Starter

mkbutan

Joined Sep 30, 2008
277
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 here25012012371.jpg

25012012373.jpg

25012012374.jpg

25012012372.jpg

25012012375.jpg

25012012377.jpg
 

Thread Starter

mkbutan

Joined Sep 30, 2008
277
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
 

Attachments

Thread Starter

mkbutan

Joined Sep 30, 2008
277
pl help
sos
sos
sos
sos
sossssssssssssssssssssssssssssssssssssssssssss
 

bertus

Joined Apr 5, 2008
19,949
Hello,

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

Bertus
 

Thread Starter

mkbutan

Joined Sep 30, 2008
277
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
 

praondevou

Joined Jul 9, 2011
2,935
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?
 

Thread Starter

mkbutan

Joined Sep 30, 2008
277
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
 

praondevou

Joined Jul 9, 2011
2,935
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?
 
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