Dual frequency remote using 2 RF modules
I am trying to make a manual robotic car controlled by wireless remote and for the "wireless remote" I wanted to make a dual frequency remote not using DTMF but two RF modules with frequency 315 and 433 MHz and, HT 12D and HT 12E as decoder and encoder for the modules.
Can anybody please help me with how can I mix these two frequencies and transmit simultaneously for a single command, say "move forward" so there is a special frequency(a mixture of those 2 RF modules) and for some other command there is some other frequency.
Thanx
its a bad idea.
why do you want to do it in this way ?
so how can i make a dual frequency remote control for a unique frequency ?
The 12E has three inputs for data, so you use one for left hand and the second for right hand. There is a transmit enable, this you can fire up with an oscillator, so it goes TX on, Tx off, TX on. ..
At the receive the 12 D has seven address lines and three data lines. So if you use the first input, this is equivalent to address one, and the second to address two. So putting an oscillator that makes these go to 1 in turn, will produce a series of 1s on data output 1 or two depending which one is being sent. The pulses need to be turned into DC and amplified to steer your robot.
Frank
Sorry, I am not able to understand.
can you please provide me with any schematic or a link or a video so that I could read or take reference from there.
thanks alot
Look at the data sheets for the HT 12D/E. Try Google for them.
Frank
i read data sheets of HT 12D/E.
but its still a confusion that how can i mix two rf frequencies and transmit them simultaneously, for different functions of my bot there should be a different frequency combination.
Why do you want to use two frequencies? Why don't you use one frequency only?
Because there is a competition and its mentioned that it should be a dual frequency remote so that it should not match with my opponents frequency.
OK. Then you don't transmit on both frequencies simultaneously. You transmit on one frequency and your opponent transmits on another frequency.
At the competition, you will have to set which frequency you transmit.
Nobody knows on which frequency the other person is using, mainly there are only 4 modules 315,350,395,and 433 MHz but by the use of encoder i can select an address which would be unique so if other person is transmitting at same frequency as mine then also it won't interfere so i can accomplish the task with 1 RF module but the problem statement states it should be a dual frequency remote.
How many "opponents" will you have at one time ?
If its only one opponent at one time, then you need to design for only 2 frequencies to be sure not to interfere.
No. If you and your opponent use the same frequency, you will interfere with each other, even if you use different addresses. You must use different frequencies.
You transmit on one frequency. Your opponent transmits on one different frequency.
Ohk thank you. I'll make two remote controllers if my opponent is using one frequency than ill use the other one, that's the only option left I guess.