HC-SR04 ultrasonic

Ultrasounds are acoustic signals whose frequencies are above the range of frequencies sensitive to the human ear. Ultrasonic sensors are capable of measuring the distance they are from an object by means of an echo measurement system.

These sensors are made up of a transducer that emits a short pulse of ultrasonic energy, when the pulse is reflected by an object, the sensor captures the echo produced by means of a receiver, and through a signal processing system, calculates the distance at which it is from said object.

Due to their characteristics, ultrasonic sensors can be found in applications such as level measurement (in tanks containing different products in liquid form), collision monitoring in parking systems, position control in fields such as robotics, plastics industry, tank filling control.

The main advantages of these sensors are that they do not need physical contact to be able to detect objects, they have a good value for money and compared to other technologies, ultrasound-based devices are compact and lightweight. The HC-SR04 consists of an ultrasonic emitter and receiver operating at a frequency of 40kHz. The sensor is powered by 5V, so it can be powered directly from Arduino, and can detect objects up to 5 meters with a resolution of 1cm.

Input Voltage: 5V
Static Current: <2mA
Operating frequency: 20KHz-400KHz
Sensor angle: <15°
Sensing Distance: 2cm~450cm
Accuracy: 0.3cm
Trigger signal input: 10us TTL impulse
Size: 4.5cm x 2.0cm x 1.3cm