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These little modules work great and are sold in a group of 5 for a great price. All 5 come bundled in a single anit-static bag, and were well packaged. Also, did you see that last line where Elego mentions they include "a little gift"? I missed that, and it was a pleasant surprise. No spoilers, but that little gift was a great help in connecting up those sensors. The range is listed to 500 cm but I started to get large margin of errors past 400 cm. I also couldn't read closer than 4 cm (not 2 cm). To get a more accurate reading within the 4 cm to 400 cm range, I found taking a moving average of the last 3 readings to be good enough to do the trick. If you're not picky, one reading is sufficient.
The PCB is well designed - it is the minimum size to hold the sonic sensors, rugged and firm. There are 4 pins; two for 5v and GND, 1 to TRIGGER it, and one to read the ECHO from. Usage is actually quite simple:
1. Send a pulse to the TRIGGER pin to start the ranging;
2. Measure the time in microseconds that it takes the ECHO pin to respond;
3. Divide the time taken by a constant (manufacturer provided; it is 58.0 for CM) to get the distance.
I'm not sure how much 鶹 will allow me to write in a review, but I'm including the minimalist sketch (no comments) below to get you started (for Arduino, sorry, I'm not familiar with Pi). This will loop the ranging while reporting the distance in CM to the SERIAL MONITOR window in the Arduino IDE every second:
--- Example Minimalist Sketch for HC-SR04 in Arduino --
/* HC-SR04 Sonic Ranging Sensor
5v to VCC
7 to Trig
8 to Echo
GND to GND */
void setup()
{
pinMode(7, OUTPUT);
digitalWrite(7, LOW);
Serial.begin(9600);
}
void loop()
{
unsigned long start;
digitalWrite (7, HIGH);
delayMicroseconds(10);
digitalWrite (7, LOW);
// Wait - for ECHO pulse
while (digitalRead(8) == 0);
start = micros();
while (digitalRead(8) == 1);
Serial.println ((micros() - start) / 58.0);
delay(1000);
}
--- End ---
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This item: Elegoo HC-SR04 Ultrasonic Module Distance Sensor for Arduino UNO MEGA2560 Nano Robot XBee ZigBee, Set of 5
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Product information
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From the brand
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ELEGOO STEM kits provide all the necessary components, sensors, wires, and boards for you to get started with programming, learning electronics, and creating IoT projects. We strive our best to make STEM education easy to learn and accessible to the young generation.
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Electronic Component
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ELEGOO STEM
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ELEGOO Stem Kit
Product Description
Operating Principle of Ultrasonic Sensor
As the name indicates, ultrasonic sensors measure distance by using ultrasonic waves. The sensor head emits an ultrasonic wave and receives the wave reflected back from the target. Ultrasonic Sensors measure the distance to the target by measuring the time between the emission and reception. The distance can be calculated with the following formula: Distance L = 1/2 × T × C where L is the distance, T is the time between the emission and reception, and C is the sonic speed. (The value is multiplied by 1/2 because T is the time for go-and-return distance.)
For Arduino Project with Ultrasonic Sensor
Elegoo Ultrasonic Sensor HC-SR04 is inexpensive and easy to use since we will be using a Library specifically designed for this sensor, which can be downloaded from elegoo.com. To use it for Arduino projects you would need an ELEGOO UNO R3 controller board.
Technical Specification
- Power Supply :+5V DC
- Quiescent Current : 3mA
- Working Current: < 5mA
- Effectual Angle: <15°
- Ranging Distance : 3cm - 450 cm/1″ - 10ft
- Resolution : 0.3 cm
- Measuring Angle: 30 degree
- Trigger Input Pulse width: 10uS
- Dimension: 45mm x 20mm x 15mm
Product Package
- 5 HC-SR04 Ultrasonic Sensors
- 10 Female-Male Dupont Cables
- 10 Female-Female Dupont Cables
- 1 Exquisite package box
- Protected with the thermoplastic film
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| Customer Reviews |
287
|
15,876
|
— |
7,551
|
— |
2,475
|
| Controller Board | NANO | UNO R3 | UNO R3 | MEGA 2560 | UNO R3 | / |
| Compatibility with Arduino | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Projects Tutorial Included | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Assembly Requirement | ✓ | No | ✓ | No | No | No |
| Reasons to Buy | ElegooKit APP; FPV Mode; Obstacle Avoidance; Line Tracking Mode | Tutorial of 24 Projects, Cost-effetive Starter Kit | ElegooKit APP; FPV Mode; Obstacle Avoidance; Line Tracking Mode | Tutorial of 33 Projects, Powerful Mega R3 Control Board | Tutorial of 33 Projects, Complete Stater Kit with UNO R3 | Tutorial of 34 Projects, Updated Version, Compatibility with Arduino IDE and STM32 |
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Customers say
The personal computer works very well with little modules that function great. Customers describe it as quality work and a great product. The sensors receive positive feedback, with users noting nice sensors and a very nice ultrasonic sensor. The device is easy to use and serves as an easy to use sensor. Customers are satisfied with the accuracy of measurements, though opinions on accuracy vary among users.
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36 customers mention functionality, 34 positive, 2 negative
29 customers mention build quality, 25 positive, 4 negative
13 customers mention sensor quality, 10 positive, 3 negative
Cheap little sensors that are pretty accurate. Easy to program and lots of sample projects online for these things.Read more
Great motion sensor! Accuracy wasn't as great but does the job well.Read more
A sensor widely used a mast have....Read more
...At the end of the day they are just cheap sensors so you do get what you pay for but everything they said about what it would do it did in fact do.Read more
11 customers mention ease of use, 11 positive, 0 negative
accurate, and easy to use, looks solidRead more
...free downloadable arduino libraries make using these so easy. my goal: to implement an array of these things to yield 360° 'vision'...Read more
...Usage is actually quite simple: 1. Send a pulse to the TRIGGER pin to start the ranging; 2....Read more
...I don't know. But, it was easy enough to just code an averaging routine....Read more
7 customers mention accuracy of measurements, 6 positive, 1 negative
...Worked fine. Got steady measurements. Well worth it.Read more
19 customers mention accuracy, 13 positive, 6 negative
Cheap little sensors that are pretty accurate. Easy to program and lots of sample projects online for these things.Read more
All sensor modules checked out okay. IR and laser (used with eye protection) are probably the better suited for instrumentation....Read more
Great motion sensor! Accuracy wasn't as great but does the job well.Read more
...The work very well and seem quite capable of detecting the surface of a water column without issue....Read more
Sonic rangers to the rescue
These little modules work great and are sold in a group of 5 for a great price. All 5 come bundled in a single anit-static bag, and were well packaged. Also, did you see that last line where Elego mentions they include "a little gift"? I missed that, and it was a pleasant surprise. No spoilers, but that little gift was a great help in connecting up those sensors. The range is listed to 500 cm but I started to get large margin of errors past 400 cm. I also couldn't read closer than 4 cm (not 2 cm). To get a more accurate reading within the 4 cm to 400 cm range, I found taking a moving average of the last 3 readings to be good enough to do the trick. If you're not picky, one reading is sufficient. The PCB is well designed - it is the minimum size to hold the sonic sensors, rugged and firm. There are 4 pins; two for 5v and GND, 1 to TRIGGER it, and one to read the ECHO from. Usage is actually quite simple: 1. Send a pulse to the TRIGGER pin to start the ranging; 2. Measure the time in microseconds that it takes the ECHO pin to respond; 3. Divide the time taken by a constant (manufacturer provided; it is 58.0 for CM) to get the distance. I'm not sure how much 鶹 will allow me to write in a review, but I'm including the minimalist sketch (no comments) below to get you started (for Arduino, sorry, I'm not familiar with Pi). This will loop the ranging while reporting the distance in CM to the SERIAL MONITOR window in the Arduino IDE every second: --- Example Minimalist Sketch for HC-SR04 in Arduino -- /* HC-SR04 Sonic Ranging Sensor 5v to VCC 7 to Trig 8 to Echo GND to GND */ void setup() { pinMode(7, OUTPUT); digitalWrite(7, LOW); Serial.begin(9600); } void loop() { unsigned long start; digitalWrite (7, HIGH); delayMicroseconds(10); digitalWrite (7, LOW); // Wait - for ECHO pulse while (digitalRead(8) == 0); start = micros(); while (digitalRead(8) == 1); Serial.println ((micros() - start) / 58.0); delay(1000); } --- End ---
Top reviews from Canada
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- Reviewed in Canada on October 21, 2016Verified Purchase
These little modules work great and are sold in a group of 5 for a great price. All 5 come bundled in a single anit-static bag, and were well packaged. Also, did you see that last line where Elego mentions they include "a little gift"? I missed that, and it was a pleasant surprise. No spoilers, but that little gift was a great help in connecting up those sensors. The range is listed to 500 cm but I started to get large margin of errors past 400 cm. I also couldn't read closer than 4 cm (not 2 cm). To get a more accurate reading within the 4 cm to 400 cm range, I found taking a moving average of the last 3 readings to be good enough to do the trick. If you're not picky, one reading is sufficient.
The PCB is well designed - it is the minimum size to hold the sonic sensors, rugged and firm. There are 4 pins; two for 5v and GND, 1 to TRIGGER it, and one to read the ECHO from. Usage is actually quite simple:
1. Send a pulse to the TRIGGER pin to start the ranging;
2. Measure the time in microseconds that it takes the ECHO pin to respond;
3. Divide the time taken by a constant (manufacturer provided; it is 58.0 for CM) to get the distance.
I'm not sure how much 鶹 will allow me to write in a review, but I'm including the minimalist sketch (no comments) below to get you started (for Arduino, sorry, I'm not familiar with Pi). This will loop the ranging while reporting the distance in CM to the SERIAL MONITOR window in the Arduino IDE every second:
--- Example Minimalist Sketch for HC-SR04 in Arduino --
/* HC-SR04 Sonic Ranging Sensor
5v to VCC
7 to Trig
8 to Echo
GND to GND */
void setup()
{
pinMode(7, OUTPUT);
digitalWrite(7, LOW);
Serial.begin(9600);
}
void loop()
{
unsigned long start;
digitalWrite (7, HIGH);
delayMicroseconds(10);
digitalWrite (7, LOW);
// Wait - for ECHO pulse
while (digitalRead(8) == 0);
start = micros();
while (digitalRead(8) == 1);
Serial.println ((micros() - start) / 58.0);
delay(1000);
}
--- End ---
Images in this review
Top reviews from other countries
-
Cliente 鶹Reviewed in Italy on December 11, 2024
Riempimento vasca
Verified Purchase - Frank W.Reviewed in the United States on January 19, 2018
Measures distance to water accurately. I'm using it to caclulate bridge clearance. Works OUTSIDE! (in a plastic box)
Verified Purchase
Complete project description follows but the keys for the Ultrasonic Distance Sensor: 1) it's been running in a plastic box, outside, for almost a month with no problem. The Arduino wakes us every 15 minutes and takes a measurement, transmits it, then goes back to sleep. 2) it is measuring the distance TO WATER! I even turned the swim jets in my pool on to test turbulence and it works fine.Frank W.Measures distance to water accurately. I'm using it to caclulate bridge clearance. Works OUTSIDE! (in a plastic box)
Reviewed in the United States on January 19, 2018
Green Pond Bridge Boat Clearance
At ‘very low tide’ the clearance under Green Pond Bridge in Cape Cod is 6’6” or less and that is too low for the boat I use. The tide charts for Falmouth, MA are theoretical and can vary as much as 18” from what is actually happening at the bridge. This system monitors the clearance and transmits the information on the internet.
All of these parts were purchased from 鶹.
Transmitter
An (Arduino) Elegoo UNO R3 board is connected to an Elegoo HC-SR04 Ultrasonic Distance Sensor. The UNO and the sensor calculate the distance from a fixed dock to the sea level, then transmit that data using a MakerFocus NRF24L01 Wireless Transceiver to the Receiver described below. The Transmitter sits on the end of a dock where there is no power, so the UNO, Transceiver and Distance Sensor are powered by the energyShield 2. This battery has special capabilities – it wakes everything up every 15 minutes. The system takes a couple readings of the distance to the water then transmits that data, then the battery shuts it all off. The data transmitted includes information from the battery – time, date, and voltage.
I have been testing this unit at home (in Dallas) and it has been operating outside, for about 20 days. Based on battery drain it looks like it will operate for about 4-5 months before it needs a recharge. When the temperature drops below zero the system still works fine but the voltage reported in the battery seems low.
All of this is housed in a plastic box printed for the purpose with a FlashForge 3d Printer Creator Pro, using eSun White ABS+ filament
Picture below.
Receiver
An (Arduino) Elegoo MEGA 2560 R3 is connected to another NRF24 Transceiver to receive the data. The MEGA does the math to convert the distance from the dock to the water, to the bridge clearance. Then the information is displayed on an Elegoo UNO R3 Touch Screen (that also works fine on the Mega).
Picture below. A small plastic frame for the Receiver was also printed on the 3d printer
Web Server
Finally, the information in the MEGA is transmitted over a serial bus to a Hiletgo ESP8266 NodeMCU ESP-12E Internet WIFI Development Board (Also operates using Arduino IDE programming). This board is connected to the MEGA via the XCSOURCE Logic Level Converter and powered by a UCEC MB102 Breadboard Power Supply Module. All mounted on an Elegoo Breadboard. The ESP8266 is programmed to be a web server. It connects to the internet through the modem/router provided by AT&T.
Picture of my cell phone below.
Images in this review
-
Giulio Tech 12Reviewed in Italy on April 9, 2025
Ottimi sensori qualita/prezzo
Verified Purchase - E.M. TullufsenReviewed in the United States on February 23, 2026
Great
Verified Purchase - D. KrakowieckiReviewed in the United States on November 9, 2025
Works great
Verified Purchase
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