The ultrasonic sensor is one of those types of electronic devices that are mainly used for the detection of a target object with the help of ultrasonic waves. The main usage of the sensor is that it will convert the reflected sound waves into the electrical waves and the sensor starts to give different signals. The transmitting speed of an ultrasonic wave is much faster than the other types of sound waves, which means it is one of the best-suited waves for the detection of targeting object. The sensor usually contains two main components in it. The first one is the transmitter which helps in the emission of signals using piezoelectric crystals and the second one is the receiver which helps to receive those signals and alert the user about it. 

However, there are many different types of ultrasonic sensors available in the market. The main difference between all of them is the sensitivity in them. From all of them Ultrasonic Sensor HC-SR04 is consider as the best one because it has the more accurate detection of the object. Along with that, it also has an accurate measurement of distance and has a high-density SMD board. Therefore, if you were looking a sensor for security systems, robotics barrier, vehicle detection then this would be your first preference. You can easily buy this product from our website or from the local market as well.