ABSTRACT
MISSILE DETECTION BY ULTRASONIC MEANS AND ACTIVATE THE DESTROYER This ultrasonic proximity detector comprising independent, battery or AC powered transmitter and receiver sections make use of a pair of matched ultrasonic piezo ceramic transducers operating at around 40 kHz each. This circuit is used in getting reflected signals of 40 KHz from the object (like a missile) to feed that to a program to the microcontroller to switch on appropriate load while the program is executed at the microcontroller end. When the microcontroller receives the signal from ultrasonic receiver it activates the door gun by triggering the gate of MOSFET through a transistor. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components