![]() The accuracy of the sensor depends on a number of factors, including the angle at which the sound waves hit the object, the surface of the object, and any interference in the environment. The HC-SR04 sensor can measure distances ranging from 2 centimeters to 4 meters (or 0.8 inches to 13 feet). In other words, the object is 17.15 centimeters away from the sensor. Therefore, if the HC-SR04 sensor measures a time of flight of 1 millisecond, the distance between the sensor and the object is calculated as follows:ĭistance = 343 m/s x 0.001 s / 2 = 0.1715 meters The speed of sound in air is approximately 343 meters per second (or 1125 feet per second). Where Speed of Sound is the speed at which sound waves travel through air, and Time of Flight is the time it takes for the sound waves to travel from the sensor to the object and back again. The distance is calculated using the following formula:ĭistance = Speed of Sound x Time of Flight / 2 The HC-SR04 sensor uses this time of flight to calculate the distance between the sensor and the object. This time is referred to as the “time of flight”. The sensor measures the time it takes for the sound waves to travel from the sensor to the object and back again. The receiver in the HC-SR04 sensor then picks up the returning sound waves. When the sound waves hit the object, they bounce back towards the sensor. These sound waves travel through the air until they reach an object. When the HC-SR04 sensor is triggered by a pulse, the transmitter emits a burst of high frequency sound waves. The transmitter emits high frequency sound waves, while the receiver listens for the sound waves that bounce back. ![]() The HC-SR04 ultrasonic sensor consists of two main parts: a transmitter and a receiver. By measuring the time it takes for the sound waves to return, the distance between the sensor and the object can be calculated. They send out high frequency sound waves, which bounce off objects and return to the sensor. Ultrasonic sensors work on the principle of sound waves. How Does HC-SR04 Ultrasonic Distance Sensor Work? ![]()
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