HC-SR04 Ultrasonic Distance Measuring Sensor Module
HC-SR04 Ultrasonic Distance Measuring Sensor Module.
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For distance measurement not exceeding 450cm, this popular HC-SR04 is a good choice by many makers and hobbysts for its low cost, stable performance and high ranging accuracy.
A short ultrasonic pulse is transmitted at the time 0, reflected by an object. The senor receives this signal and converts it to an electric signal. The next pulse can be transmitted when the echo is faded away. This time period is called cycle period. The recommend cycle period should be no less than 50ms. If a 10μs width trigger pulse is sent to the signal pin, the Ultrasonic module will output eight 40kHz ultrasonic signal and detect the echo back.
The measured distance is proportional to the echo pulse width and can be calculated by the formula above. If no obstacle is detected, the output pin will give a 38ms high level signal
- Power Supply : 5V DC
- Quiescent Current : <2mA
- Effectual angle : <15°
- Ranging distance : 2cm – 450 cm
- Resolution : 0.3 cm
- Ultrasonic Frequency : 40kHz