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HC-SR04 Ultrasonic Sensor
- HC-SR04 Ultrasonic Sensor is a device that can measure the distance to an object by using sound waves. It measures distance by sending out a sound wave at a specific frequency and listening for that sound wave to bounce back. By recording the elapsed time between the sound wave being generated and the sound wave bouncing back, it is possible to calculate the distance between the sonar sensor and the object.
Technical Specification
- Power Supply :+5V DC
- Quiescent Current : 3mA
- Working Current: < 5mA
- Effectual Angle: <15Ā°
- Ranging Distance : 2cm - 450 cm
- Resolution : 0.3 cm
- Measuring Angle: 30 degree
- Note: The module should be inserted Fortunately, the circuit board re-energized, and avoid the high malfunction, if they have re-energized before they solve.
HC-SR04 Themodule works
- IO trigger ranging to at least 10us high signal;
- Module automatically sends eight 40kHz square wave, automatically detect whether a signal return;
- The signal to return, a high IO output, high duration of
- Test distance = ((Duration of high level)*(Sonic :340m/s))/2
Customer
Reviewed in the United States on January 17, 2025
Buen sistema
Olaf HernƔndez
Reviewed in the United States on May 14, 2024
I didn't test them at all yet. But they look good.
Ayrton Ronaldo Rojas Calla
Reviewed in the United States on May 10, 2024
Excelente atencion fecha de envio corresponde al lo publicado, recoemndable
Jim Wreyford
Reviewed in the United States on February 23, 2024
Have not used them yet but they look like they should work as advertised.
R1
Reviewed in the United States on November 17, 2023
2 of the boards were DOA, 1 of the sensors failed rapidly. 1 sensor appears to be returning arbitrary values. This particular purchase was a bust.I'd had such good luck with these sensors in the past that I didn't expect a failure at all of the sensor (there isn't much to them).In my application, I cut off the offset mounting ring and trim the rubber insulating grommet, install the sensor in the end of a piece of 3/4" PVC pipe, which then serves as a mount. To lock it in place, I made a ring of hot glue around the sensor edge protruding just slightly from the pipe, then buried it from behind in about a 1/2" of hot glue. I've made about a dozen of these rigs. Some have been running 1 sample per second for over a year with no problem.I may buy again to see if this was a fluke. I have not tried to return since I modified the mounts and have one sensor installed 200 miles from my home. I expect I'd need to return all three together, so just gonna suck it up and figure this was a "1 sensor for the price of 3" kind of deal... :D
John H.
Reviewed in the United States on November 16, 2023
Bought this to measure the remaining salt in my water softener. So far working great and seems to be holding up well in the salty environment. When using this unit with ESPHome's utrasonic platform, you have to set the pulse_time value to at least 20us. The default of 10us is too low, and will result in no or erratic values.
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