DTMF controlled robot - querries

dtmf controlled robot

hie I m Tejas doing my final year and m planning to take up DTMF controlled circuit application for eg. a wireless robot or a door lock etc.
First of all i m newbie and dont have exact knowledge on dis.
I want to know dat will dis circuit require using two cell phones one used as a remote and the other one on the robot or will a single mobile phone used as a remote and a DTMF decoder circuit on robot work?
In the first case will i have to make calls to the other cell phone on the robot everytime for controlling it and how will d robot be den controlled??
In the latter case how will i control d robot using a single phone and a DTMF decoder?Is it something like i have to just press d number keys without actually making a call??
Can u pls pls Help me out i m really confused.
God bless you and waiting for ur earliest reply.
thanks

mobile phone controlled robot

if you are using mobile fone why don't you try AT Commands and use SMS for controling feature

You have to use two mobile phones and yes you have to connect a call every time whenever you wanna control you robot.

It Can't be done with single mobile and some other circuit
other circuit is mobile .

In my opinion try using AT Commands and use SMS for control.

dtmf + mobile control robot

thanks buddy
can u help me to understand den how will d DTMF controlled circuit if used in a door lock work??
it will reply a single cell phone used as a remote and a DTMF decoder circuit connected to lock isnt it??
also i find d sms controlled system very interesting but i dont know what is AT commands and other basic information dat is a must for d project can u pls help me from where will a get all such precise and exact information.
Also if everytime i need to make a call den ppl will definately raise a point for shelling out cash for moving a robot everytime??
i really thank u for ur reply and hope to be in touch if i have more querries.
thanks
-Tejas