This android has been integrated with a sound intensity indicator and a metal detector, which has been combined through a micro controller such that an alarm sounded upon triggering of either. PIC16F84 is the key element in this circuit. It is capable of traveling through a predefined random path and will search any metallic object as well as checks the noise level along the path. The metal detector used here is an inductive proximity sensor which is able to detect any metallic object placed in the vicinity of the sensor. Upon detecting the metallic object the sensor gives a high in the control output terminal. The sound level detector is based on LM 3914 which consists of ADC and decoder. The decoder outputs
gives indication of the sound level. We can choose the peak noise level out of these outputs. Upon reaching any of these two interrupts the it will stop the very place where it has been got the interrupt and will give alert up to when the metallic object is removed or the sound level is reduced below the peak value. Then it will continue the search.
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