HC-SR04 Description
This product is the second generation of the popular HC-SR04 Low-Cost Ultrasonic Sensor. Unlike the first generation HC-SR04 which can only operate between 4.8V to 5V DC, this new version has a much wider input voltage range, allowing it to work with the controller operating on 3.3V.
HC-SR04 ultrasonic sensor provides a very low-cost and easy method of distance measurement. It measures distance using sonar, an ultrasonic (well above human hearing) pulse is transmitted from the unit, and distance-to-target is determined by measuring the time required for the echo return. Output from the sensor is a variable-width pulse that corresponds to the distance to the target.
HC-SR04 Features
Wide operating voltage range: 3.0 – 5VDC
Provides precise, non-contact distance measurements within a 2cm to 4m range
Communication: Positive TTL pulse
15 mA operating current
4-pin header, no soldering required
HC-SR04 Applications
This sensor is used to measure speed as well as the direction between two objects.
It is used in wireless charging.
Medical ultrasonography.
This is used to detect objects & avoid obstacles using robots such as biped, pathfinding, obstacle avoidance, etc.
Depth measurement.
Humidifiers.
