Get rid of those long wires tat tangle all the time , there are different ways of making a wireless module using ready made rc cars n putting relays near the out put u can drive u r 12v motors ,then theres IR remote control though not tat much reliable n then theres dtmf tats thr cell phone n gprs communication, n the most simplest of them using rf modules , in consideration with all the above ways rf module is the most easiest n most cheapes (RS 550) nothing more .
This shows the transmitter(TX) n reciever (RX) which u get in electronic shops. TX 01 ASK MODULE and RX 02 ASK MODULE are used here n shown above .
our basic idea goes like this
The two ics HT12E n HT12D r the encoder n decoders of 4 adress bit this is used as we need to drive two motors ,where each motor takes in 2 adress bit (1 for forward rotation other for reverse ) so in all we need four adress bits
if u want to control more number of motors u need to change encoder and decoders. At place of those switches u can either use push buttons r dpdt switches (ckt of dpdt switch is show here click here)
now near the recieving end u use a motor driver bcoz u get 5V as output but motors need 12v to drive them(i have explained this here in much detail ) The ckts are shown over for transmitter and recieving end
D1 D2 D3 D4 will go to the input of motor driver (check the motor driver ckt) n from motor driver to the motors .
This ckt has been tested by me n was giving a ver good range also.The best place to buy is aplusindia.com it sells it for very cheap and u dnt get much cheaper than at this place.
Hope i have made it very clear .