Cellphone controlled Land Rover: DTMF Technology
In this article, we will learn about the DTMF Technology on which, land-rover working. As we see remote controlled car which plays by many kids but have you noticed a thing that it works only in the confined area. It will not work if goes out its RF range. So, DTMF technology overcome this issue and makes this project more useful in many applications.
If you want to showcase your technical skill then Robotics is the best part among all.
As the project name is Cellphone controlled Land Rover so, here we are using two cellphone. One is attached to the project and other will be handled by us that will work as Remote.
You must have to enable auto call answering mode in the cellphone with enabling its dial tone too before attaching to project via audio jack.
Now, we will talk about its main blocks, are:
First of all, we call the phone which is attached to project and after ringing it will be connected automatically via auto answering mode. We have keypad 0 to 9 with *,# on cellphone and each digit has its own frequency. Dual Tone Multiple Frequency(DTMF) works here after connecting both cellphones. Now, if you press any button device works accordingly. Suppose you are pressing button 2 then device will run in straight mode or, backward mode or, right or, left mode according to the programming that you done on Micro-controller. Components Used:
DTMF Decoder IC(HT9170)
Microcontroller(ATMega 16)
Motor Driver IC(L293d)
Hex inverting gate(74LS04)
Capacitors, Resistors
DC Motor
Crystal Oscillator Working procedure
DTMF signal generates from the remote phone and then receive by other phone connected to device. Those signal send to DTMF decoder section where signal decodes and convert to hexadecimal number. For recognizing signal to Micro-controller, we need to have Hexa decimal numbers(Hex number) and after that signal send to Motor driver section. We are requiring here, motor driver IC and motor can accelerate without the IC but we are using it, why? because of amplifying the signal that receive from Micro-controller and given to driver IC for boosting the signal and proper response. According to the received signal motor moves left and right or, Forward and backward.
DTMF decoder, Micro-controller and Motor driver, here three are the main components for the project. Cellphone has 16 DTMF Tone pairs and DTMF decoder IC converts it into 4-bit code output. Applications
We can use this project in the following arena:Future Modification
If you are attaching camera with project then it can be a part of Spy robot. You must know a thing for adding a camera, you have to use RF frequency for getting output on monitor(Mini scale)and it depends also on distance but project will be more useful.
You can also add IR sensors for avoiding obstacles if device goes beyond limitation.
Password security could be implied on this project so, no one can operate it without having correct password.
Alarm phone dialer, is another useful future application available for this project.Conclusion
As i discussed above, that we operate many robotic car or, robotic project but never notice the applied technology behind it. Most of the robotics use with RF frequency range and the drawback of it, is limited working range. Only DTMF technology overcome this limitation and makes project more reliable.
References:
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