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Description
Ultrasonic sensor operating in the range from 2 cm to 400 cm. It is powered with voltage of 5 V. The output is a signal whose duration is proportional to the measured distance.
Specification
- Supply voltage: 5 V
- Average current consumption: 15 mA
- Measuring range: from 2 cm to 400 cm
- Angle of measurement: 15 °
- Output: frequency signal
- Color: red
- Dimensions: 45 x 20 x 15 mm
Details inthe documentation.
Method of application
To begin the measurement, you must specify the output pulse voltage on the pin TRIG (high state 5V) for 10 s. The module measures distances using sound wave with a frequency of 40 kHz. To the microcontroller, a signal is sent, in which distance depends on the duration of high state and it can be calculated by the formula:
test distance = (high level time × velocity of sound (340m/s) / 2
where:
- test distance - the measured distance
- high level time - duration of high state
- velocity of sound - velocity of sound waves' emission in air - 340 m/sec
In short, to get the result in centimeters, use the formula:
distance[cm]= ( high level time[us]* 34 ) / 1000 / 2
The measurement procedure is shown in the figure below.
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