Security System Based on Ultrasonic Sensor Technology
Shinu N Yoannan · IOSR Journal of Electronics and Communication Engineering · 2013
In this paper we design and implement a security system with an ultrasonic sensor module to enhance the system's reliability.The ultrasonic sensor contains a transmitter and a receiver and the module is placed in a rotating motor.It is assumed that an ultrasonic sensor is set in a rotating motor to cover a wide range.The Ultrasonic transmitter periodically emits ultrasonic signals into an open area.A rotating motor is used to allow the sensor to cover whole 360 degrees.If the signal ever hits any physical objects, it will be reflected back and the receiver part of the sensor will then capture it.The microcontroller unit (MCU) will constantly check for the receiver output of the ultrasonic transmitter.If the receiver output is high, the MCU will perform distance analysis of the object from the sensor using the fact that ultrasonic waves travel in air at 340m/s.The time taken for the waves to hit the object and return can be calculated as the time taken for the receiver output to be high after the transmitter has been initiated to send ultrasonic waves.Once the distance is calculated, MCU checks whether the object is within the range threshold specified within the MCU for initiating the alert.If the object is within the range threshold, the MCU initiates a sound alarm and also the global system for mobile communications (GSM) modem to send short message service (SMS) or call to the concerned person.