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	{{#seo:\|title=~~아두위키~~ : ~~초음파 센서~~(HC-SR04)\|keywords=~~아두이노~~, ~~초음파센서~~, HC-SR04\|description=~~아두이노에서 초음파 센서를 사용하는 방법~~}}		{{#seo:\|title=ArduWiki : Ultrasonic Sensor (HC-SR04)\|keywords=Arduino, Ultrasonic Sensor, HC-SR04\|description=How to use an ultrasonic sensor with Arduino}}
	[[File:초음파대표이미지1.jpg\|center\|class=coders70]]		[[File:초음파대표이미지1.jpg\|center\|class=coders70]]
	This is a sensor that measures distance using ultrasonic waves. The accuracy may vary depending on the environment. The process of measuring the distance value goes as follows:		This is a sensor that measures distance using ultrasonic waves. The accuracy may vary depending on the environment. The process of measuring the distance value goes as follows:

ArduWiki: Created page with "{{#seo:|title=아두위키 : 초음파 센서(HC-SR04)|keywords=아두이노, 초음파센서, HC-SR04|description=아두이노에서 초음파 센서를 사용하는 방법}} class=coders70 This is a sensor that measures distance using ultrasonic waves. The accuracy may vary depending on the environment. The process of measuring the distance value goes as follows: '''[Ultrasonic emission -> Reflection of ultrasonic waves -..."

2024-03-24T05:21:04Z

Created page with "{{#seo:|title=아두위키 : 초음파 센서(HC-SR04)|keywords=아두이노, 초음파센서, HC-SR04|description=아두이노에서 초음파 센서를 사용하는 방법}} center|class=coders70 This is a sensor that measures distance using ultrasonic waves. The accuracy may vary depending on the environment. The process of measuring the distance value goes as follows: '''[Ultrasonic emission -> Reflection of ultrasonic waves -..."

새 문서

{{#seo:|title=아두위키 : 초음파 센서(HC-SR04)|keywords=아두이노, 초음파센서, HC-SR04|description=아두이노에서 초음파 센서를 사용하는 방법}}
[[File:초음파대표이미지1.jpg|center|class=coders70]]
This is a sensor that measures distance using ultrasonic waves. The accuracy may vary depending on the environment. The process of measuring the distance value goes as follows:

'''[Ultrasonic emission -> Reflection of ultrasonic waves -> Detection of the returning ultrasonic waves].'''

== '''Sensor Operating Principle''' ==

# Ultrasonic waves are generated through the trig pin.
# Immediately after the ultrasonic emission stops, the echo pin maintains a HIGH state.
# When the emitted ultrasonic waves return and are detected, the echo pin is changed to LOW.
# The time it takes for the ultrasonic waves to travel and return is obtained using pulseIn(echoPin, HIGH);.
# This time is then used in a formula to calculate the distance.

== '''Measuring Distance''' ==
{| class="wikitable"
| colspan="1" rowspan="1" |Ultrasonic Speed
| colspan="1" rowspan="1" |340m/s
|-
| colspan="1" rowspan="1" |Round-trip time of ultrasonic waves
| colspan="1" rowspan="1" |x
|-
| colspan="1" rowspan="1" |Distance to the object
| colspan="1" rowspan="1" |y
|}
<math>y = \frac{17}{10^3}x[cm]</math>

== '''Specifications''' ==

* Operating Voltage: 5V
* Operating Current: 15mA
* Operating Frequency: 40Hz
* Ultrasonic Frequency: 40kHz
* Maximum Detection Distance: 4m
* Minimum Detection Distance: 2cm
* Measurement Angle Range: 15 degrees
* Trigger Input: 10µs TTL pulse

== '''Required Hardware''' ==

* Ultrasonic Sensor (HC-SR04)
* Arduino Board
* Jumper Cables

== '''Connection''' ==
Trig and Echo can be connected to any desired pin number (in this document, pins D3 and D4 are used).
[[File:초음파 센서 연결.png|center|class=coders100]]
{| class="wikitable"
| colspan="1" rowspan="1" |HC-SR04
| colspan="1" rowspan="1" |Arduino UNO
|-
| colspan="1" rowspan="1" |GND
| colspan="1" rowspan="1" |GND
|-
| colspan="1" rowspan="1" |VCC
| colspan="1" rowspan="1" |5V
|-
| colspan="1" rowspan="1" |Trig
| colspan="1" rowspan="1" |D3(changeable)
|-
| colspan="1" rowspan="1" |Echo
| colspan="1" rowspan="1" |D4(changeable)
|}

== '''Example Code''' ==
This example checks the distance on the serial monitor.<syntaxhighlight lang="c++" line="1">
#define trigPin 3
#define echoPin 4

// Variable to hold the round-trip time of ultrasonic waves
double pulseTime;

void setup()
{
// Set the mode of each pin
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);

// Initialize serial communication at 9600 baud rate
Serial.begin(9600);
delay(2000);
Serial.println("Connection successful");
delay(500);

// Initialize trig signal
digitalWrite(trigPin, LOW);
}

void loop()
{
// Start ultrasonic signal
digitalWrite(trigPin, HIGH);

// Generate ultrasonic waves for 10µs as per sensor specifications
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

// Measure round-trip time of ultrasonic waves
pulseTime = pulseIn(echoPin, HIGH);

// Calculate distance to the object
double distance_cm = pulseTime * 17 / 1000;
double distance_m = distance_cm / 100;

// Display error if the measurement is out of the sensor's specifications
if ((distance_cm < 400) && (distance_cm > 2))
{
Serial.print("Distance (cm) = ");
Serial.println(distance_cm);
Serial.print("Distance (m) = ");
Serial.println(distance_m);
Serial.println("--------------------------------------------------");
}
else
{
Serial.println("Out of sensor range");
}
delay(1000);
}

</syntaxhighlight>

Ultrasonic Sensor(HC-SR04) - 편집 역사

2025년 3월 27일 (목) 05:42에 ArduWiki님의 편집