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For this, you shouldn't need to use any micro controller.
Just go through the following circuit and tutorial... If you found any difficulty to understand, edaboard is always there.
And do read the datasheet of HT-12E & HT-12D to know the concept why you need it.
& if you still want to use micro controller then you can replace HT-12E & Ht-12D from Rx & Tx side with Controller, and do the programming to fulfill the task of encoding.
How much data you need?
As per your goal, to make a remote controlled car this 4 pins are enough for you.
You can have total 2^4 = 16 combinations out of these 4 pins.
you require to send :
"1010" for forward
"0101" for backward
"0110" for left
"1001" for right
at Rx side give these 4output pins of HT-12D to Motor driver...
hope you get this
However, if your main task is the transmission of data or representation of a exceedingly large number of states, I might consider taking a different route.
Nordic manufactures several RF data transceivers, one particularly popular device is the nRF24L01+ which offers a standard SPI interface.
Difference is of max. capacity of sending Data.
with 4 pins you can send max. 16 combinations(2^4 data) [without any MCU]
with 8 pins you can send max. 296 combinations(2^8 data) [without any MCU]
For your application (wireless car) 4 pins are enough.
you need to use total 5 combination,
"0000" for stop
"1010" for forward
"0101" for backward
"0110" for left
"1001" for right
@ Nipuna, There is no difference between the one which you've post and the one which you've in your tutorials.
If you observe both of them carefully then in 8 pins Rx module you'll find 2 pins of Vcc, 2 pins of Gnds, 2 pins of Data, 1 for antenna & 1 for NC (no connection); & in the Rx module with 4 pins you'll find 1 Pin for Vcc, 1 pin for Data, 1 for Gnd & 1 for Antenna.
NO DIFFERENCE IS THERE.
I've used both, so you can handle your Rx modules with the tutorials you've without any hesitation.
As bigdogguru said you've select ASK module but whatever you select ASK/FSK module you can follow the same concept without being confused, just start it first; you'll get cleared once you get the blinking LEDs on Rx side.
The TX module will have Vcc - 5volts, Gnd- negetive, Data IN -from HT12E and Ant-Just a piece if wire..Just connect it respectively.
On RX module you'll see Vcc - 5volts, Gnd- negetive, Data out -from HT12D and Ant-Just a piece if wire...
For antenna any piece of wire about 15 cms will get good range. For testing on table no antenna is required.
Cheers
If your Rx-Tx are too near then the pin's length of the Antenna is enough to work as antenna for that particular distance.
As per my experience I've Received data without antenna from 7-8 feet.
And for the better range(I've got 25-30 meter) take a wire of same length(I've used 30cm) at both the side.
Make spiral shape through the antenna wire as to have a 30cm wire at remote/car side may be not a convenient option so make a spiral roll type shape from the wire of 30 cm, and then use it as antenna at both side.
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