Hi Friends,

Now a day 433 Mhz RF Module is very commonly used in all Embedded or Robotics Application.

Most all of use are using HT12E and HT12D IC for this application and there is one problem happening to all of you and that is Latch problem.

This Encoder Decoder IC don't Provide Latch facility so we have to continuously press the key (Switch) to continue some phenomena.Let if we are using this module to turn on one light of our Home then it should work like once i will press the switch and riles  it then light will turn on and if i will press switch another time then Light should be turned off.... 

But if we will use this HT12E and HT12D then it will not five us Latching or denouncing....

So the Light will only work when and when switch is pressed as we riles the switch light will turn off.

So in this case one way is that to use a Ready ST12E & ST12D IC from Sunrom.com  which will provide Latching facility also.

Other way is to make this project on Micro controller.We can use PIC or ATMEL any MCU which provides UART.

Directly Connect your TX module's TX PIN and MCU's UART TX pin and other side RX module's RX pin with other MCU's UART RX pin.

Now you can simply write uart program and send whole string via RF Module and can do any of the stuff what ever you want.

I have tested this thing on PIC16F886 with 1200 Baud rate....If any one have any kind of query regarding hardware and software please reply here....