The two circuits shown are actually equally suited to IR or RF as the means of transmitting and receiving data wirelessly.

how, i am not getting how to connect IR led with it, with polarity?

 

We can start with the transmitter side. Post a schematic of your IR transmitter circuit and I can then tell you which pins ton your IR transmitter circuit to connect to which of the three pin connector on the HT12E encoder circuit shown in the link in post #18.

hgmjr

 

Here is the TX. side tell me simple schematic for it..............

 

My request was for a schematic of your IR transmitter circuit showing your IR emitter and its part number and its driver. When I see your circuit for the IR emitter and its driver then I can instruct you on how to connect it to the HT12E device.

hgmjr

 

Hi again,
Please you give me the right schematic, i have copied it from its 12E data sheet.
, and the IR led has no part no. on it.!!

 

Hi,

today i got Tx & Rx, i am sure of its freq. i think it is of 433Mhz.....

now please help......!!

Thanks

 

Take a look at the example circuits shown here and see if they help.

hgmjr

 

Hi again,

I have buy RX & TX in my local market.

I am sorry to ask so many question!!

Let start with beginning, i am making this wireless switch for my robotic car in this there will be 4 gear motor operated by this holtek decoder (right,left, forward, reverse...)

i have assembled the circuit in my breadboard, it seem to not working i have taken 5V power supply , the encoder osc. have 950Kohms(=1Mohms) variable resistance & in decoder it is of 50Kohms variable resistance.........

In encoder & decoder all add. pins are left open and the transmission enable is set to low active the data pins one of them is kept low directly to GND ( no Diode Used), & Dout is given to TX

in decoder part the Valid transmission is set to High active with V cc directly....
and all add. are left open the Data pins are connected to led's ....



Now i want to know first how to check whether the RX & tx is working without HT 12e/d............


Thanks..!!

 

Testing the transmitter module and receiver module as a standalone pair (without the HT12E or HT12D) should be a matter of powering them and feeding a squarewave signal into the data input on the transmitter and monitoring the data output of the receiver. This would be a good opportunity to also check the range.

hgmjr

 

I don't have Oscilloscope(CRO).....can i put an LED??

 

OK, after using 2 LED from GND & Vcc to dta output there are no changes i have seen both led were glowing....on touching the tX data pin to GND & Vcc there are no changes...!!


Note: i have not used resistance in sereies with the led's...


Now i am using a npn switching transistor, when there is no data i.e. the Tx is open the Rx data out blink(on/off) when i touch the data in of Tx to gnd & vcc the output of Rx is contiously glowing.........

Now pls help..

 

I s there any wrong statement in my post??

 

Hello guys & gals,

Now my holtek 12E/D with 433Mhz Tx & Rx are working..........
it was sily mistake in assembling it..........


Thanks for the help..