'anbul 2004 
dia (ASI) 
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88 (1), pp. 
Is — Delhi, 
ibution | of 
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Calcutta. 
don. 
lath, Delhi. 
idon Press, 
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drigins, Us 
Penguin. 
iction of the 
'ehborhood. 
Humphrey, 
late Mughal 
Monumental 
. American 
970. Delhi: 
riod. Three 
Robotics And Remotely Operated Vehicles 
P. A. Kulkarni 
S. G. Karad 
MAE, Alandi, Pune, India. 412105. pakulkarni@mitpune.com, shivajikarad@mitpune.com 
Abstract - In this paper, we present controlling of a Robot using DTMF technique. Reliable 
surveillance is a need of the current environment. The system should be easy to operate, efficient, cost 
effective & flexible for further improvements. We have designed a robotic system whose direction of 
motion can be controlled by simple cordless phone, which makes us e of DTMF codes. In these 
days remotely operated vehicles are mostly needed in military applications. It is difficult for robots 
that are going to be used in military technology to become fully / artificially intelligent. Our tele 
video controlled robot is also one type of telepresence robot. The operator controls it using the handset 
of the cordless phone. It has a wireless camera that transmits an actual video at the operator’s 
monitor. The system consists of main blocks: cordless phone, micro controller (89C5 7), 
DTMF 
decoder (MT8870D), Xcam 2(wireless camera), driver control logic, peripheral control logic, power 
supply unit & TV monitor. 
I. INTRODUCTION 
The MT8870D is a complete DTMF 
receiver integrating both the band split filter and 
digital decoder functions. The filter section uses 
switched capacitor techniques for high and low 
group filters; the decoder uses digital counting 
techniques to detect and decode all 16 DTMF 
tone-pairs into a 4-bit code. External component 
count is minimized by on chip provision of a 
differential input amplifier, clock oscillator and 
latched three-state bus interface. 
The main features of DTMF MT8870D are as 
follows 
* Complete DTMF Receiver 
* Low power consumption 
* Internal gain setting amplifier 
* Adjustable guard time 
* Power-down mode 
* Inhibit mode 
Main applications are as follows 
* Receiver system 
* Paging systems 
* Repeater systems/mobile radio 
* Credit card systems 
* Remote control 
* Telephone answering machine 
I. A. Block Diagram: 
The block diagram mainly consists of the 
following sections: 
L.A.1. Cordless Telephone 
Desired goal of our project is to achieve 
wireless control. To achieve this goal we use the 
cordless phone. The operator using the handset 
will transmit the specific control signal. 
I.A.2. DTMF Decoder (MT 8870D)