reflected back, the ultrasonic module outputs an echo signal, so it can determine the distance of object from the
time difference between trigger signal and echo signal.
Ultrasonic sensor has a wide range of sensitivity, no blind area, and no interference with obstacles.
As the following picture shown, it is our keyestudio ultrasonic module. It has two something like eyes.
One is transmitting end, the other is receiving end.
TECH SPECS:
Operating Voltage: 5V
（
DC
）
Operating Current: 15mA
Operating Frequency: 40khz
Maximum Detection Distance: 3-5m
Minimum Detection Distance: 3-4cm
Sensing Angle: less than 15 degrees
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