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Olga Lebedeva
2025-08-19 13:54:11
It does what it should, but does not work with 3.3V.
Cecil Clontz
2025-08-06 18:29:03
The first thing you notice is that these are very nicely packaged rather than the typical plastic bags. They also come with both M-F jumper wires and F-F jumper wires. The sensors work as expected and the quality of the PCB looks good. Even the solder joints look great. I would buy these again.
Wayne Fernandez
2025-07-27 12:58:17
These are not cheap knockoffs. They come in a very high end packaging. They work brilliantly. Any library I've tried with them works great. They don't give erroneous readings like some of the cheap clones do. These are better quality than the Elegoo ones that I purchased before these. By a good bit too. Highly recommend. Will be stocking up on these.
Customer
2025-06-26 15:50:13
What i like is items like this are available for a good price. fun to mess with.
Scott I.
2025-05-17 17:47:29
I mainly got these ultasonic sensors to play with and learn more about electronics. I have been able to hook them up to my Arduino for testing purposes and they work as expected. The range and accuracy is inline with the specs (~.5 inches to 15+ feet). I hope to add them to little autonomous cars that have light and proximity sensors.Even though my experience is somewhat limited, these have been good for my education purpose so far. I happy with these and would recommend to others looking for a set of ultrasonic sensors.
Todd K. Moyer
2025-05-16 17:08:06
This ultrasonic ranging module is easy to apply, and seems quite well-made, especially considering the price.The sensors do not come with a datasheet or instructions of any kind. An internet search for "HC-SR04" should work to find the datasheet.I do think it may be frustrating to try to measure distances of 4-5 m, as is claimed for this module, unless you have a very specific, controlled environment that is free from objects that may confuse the sensor. I did confirm that it can measure distances down to about 20 mm, though it becomes critical to know precisely what the plane of the measurement is. I used the edge of the silver transducer enclosure, but the real transducer is buried inside. You may be able to calibrate that offset out, with some careful characterization.Check out the attached oscilloscope screen shot to see the basic operation of this module. It only needs 4 connections, VCC/GND for power, and a trigger pulse input, which produces an echo pulse output. The echo pulsewidth is proportional to the distance between the module and the object being ranged.The trigger pulsewidth does not seem to be critical, but it is specified to be 10 us minimum. I tried widths as low as 1 us and found that it worked reliably. At 500 ns, operation was intermittent. I would not recommend going below 10 us, per the datasheet. The 'scope photo shows a 1 ms trigger pulse. The echo pulse seems to consistently come 2.2 ms after the falling edge of the trigger pulse.The 'scope photo scenario was measuring a distance of about 280 mm. My setup was not intended to produce very accurate distances, but to show the operation over a range of distances. The resulting echo pulsewidth was averaging 1.616 ms, which given the formula in the datasheet, leads to a distance measurement of 275 mm, which seems reasonable.In my testing current consumption of the module was about 3 mA with a 5 V power supply.
PRODUCT REVIEWER
2025-05-04 12:40:31
This product is most easily used with a microcontroller that allows high-speed input and output of electrical signals. There are four wires that need to be hooked up to use it - two are power and ground, the other two are the trigger and the echo. This device works line sonar on a submarine. It sends out acoustic "pings" above the limits of human hearing under command, and then listens for the return from the reflection of the transmitted noise of of something in front of the sensor. Under program control of the microcontroller and with some simple math, the distance can be calculated.I used the Arduino NANO microcontroller to test (also available on Amazon for 9 USD) the sensors. The setup involved connecting 4 pins on a bread board, and then writing the code below:int TRIG = 14;int ECHO = 15;int DURATION;float DISTANCE;void setup() { pinMode(TRIG, OUTPUT); pinMode(ECHO, INPUT); Serial.begin(115200);}void loop() { digitalWrite(TRIG, HIGH); delay(1); digitalWrite(TRIG, LOW); DURATION = pulseIn(ECHO, HIGH); DISTANCE = DURATION / 58.2; Serial.println(DISTANCE); delay(200);}That's it! All of the action in the code is in the 7 lines inside the loop function. Send out a 1 millisecond pulse, measure the time until it returns, convert that time to distance. Easy Peasy.Here's the output of the program:14:37:38.571 -> 7.3414:37:38.803 -> 7.3414:37:39.001 -> 7.4214:37:39.200 -> 7.4214:37:39.432 -> 7.4214:37:39.631 -> 7.42For a total outlay of 12 bucks and a couple of minutes of assembly, this is an easy to use, absolute bargain of a solution. I should mention the build quality is great, and the silk screen is easy to use and interpret. Would buy again (but now I have 5!)
Monte
2025-02-01 11:19:30
These work great! I got them for my son and I to complete our “auto-opening trash can lid†that we saw on tiktok and overall it was a great success! These are relatively easy to use and hooking up to my arduino board (VCC to 5v and Grnd to Grnd - Trigger and Echo to their your chosen digital pins) - They can read as close as 20mm and up to 4000mm (not confirmed max distance) There’s really a wealth of information on these (HC-SR04) on the web as well as coding and programming tools to get you started depending on your specific project, but getting something built that is really cool AND functional was so easy! Hands down would get these again! 10/10 a win!
LEE BASHAM
2025-01-30 17:23:54
Used these to make a small radar reversing system.
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