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CHAPTER I 1 INTRODUCTION 1.1 DESCRIPTION OF PROJECT The basic idea employed here is to devise a wireless controlled and manual monitored Robot which is able to sense abnormal and some specific conditions in the working environment. Dynamic : Complete system is active motion Versatile : Multitasking functions in applications Surveillance : Monitoring and observation Robot : Movement, sensing, intelligence and control The wireless control involves radio frequency land rover system, remote controlled arm. The wireless manual monitoring necessitates wireless real time video capturing with audio support. The environmental sensing entails abnormal high temperature sensing, environment abnormal illumination sensing and high sensitive metal detection (both ferrous and non-ferrous). 2 1.2 BASIC PRINCIPLE INVOLVED WIRELESS REMOTE CONTROLLED LAND ROVER The commands to the land rover is from radio frequency transmitter (SCTX2B), which transmits the signal processed for corresponding switching pulse at 35MHz frequency range. It is received at radio frequency receiver (SCRX2FS), and this is processed and given to corresponding driver circuitry to drive the motors. WIRELESS REMOTE CONTROLLED ARM The commands to the arm is from radio frequency transmitter (TX02), which transmits the signal processed for corresponding switching pulse at 35MHz frequency range. It is received at radio frequency receiver (RX02), and this is processed and given to microcontroller to drive the motors. TEMPERATURE SENSOR In Temperature sensor unit, a reverse biased Germanium diode is used. At room temperature the reverse resistance of diode being very high (over 10KΩ) hence produces no effect on transistor. At abnormal high temperature reverse resistance of diode drops and switches the transistor to sound alarm. 3 METAL DETECTOR The circuit in High sensitive Metal detector works on the principle of detecting the amplitude of a waveform. This is called Amplitude Modulation. When a metal object is placed near the detecting coil, some of the magnetic flux passes into the object and creates a current called eddy-current. This uses-up some of the magnetic flux and thus less flux is available for the receiving secondary coil. Low voltage at receiving coil drives feedback transistor circuits and sounds alarm. AUTOMATIC ILLUMINATION SYSTEM In Automatic illumination system the LDR acts as sensor which activates/deactivates the relay (connected to doom light) depending on light illumination of environment. At no light illumination environment resistance of LDR is high of megaOhms and activates the relay to switch on doom light array. At light illumination environment resistance of LDR drops and deactivates the relay. 4 1.3 APPLICATIONS Surveillance in inaccessible areas of earth where humans can’t work. Bomb detection and disaster management (e.g. earthquake areas). Surveillance in abandoned mines where humans are restricted. Surveillance for safety and maintenance operation in A/C ventilators and similar functions (where Robot requires minor modification). 1.4 ADVANTAGES Multi tasking in applications and reliable in long operation. Wireless live video cum audio capturing and play back. Capable of detecting ferrous as well as non-ferrous metals. Capable of working in low light illumination environment. Environment sensing capabilities. 1.5 DISADVANTAGES Requires continuous manual monitoring and control. Prone to radio frequency noises and radio interferences. Bombs cannot be detected other than from ground surface. Highly complicated design and time consuming construction. 5