Hc-sr04 Ultrasonic Distance Sensor
In this instructable I will show you how to make an ultrasonic sensor (hc-sr04) that measures distances up to 200 cm.


Step 1: Parts And Tools

Hc-sr04 Ultrasonic Distance Sensor
These are the parts and tools needed to make this project:

Step 2: Attach Ultrasonic Sensor

Hc-sr04 Ultrasonic Distance Sensor
Attach the ultrasonic sensor to the breadboard and attach 4 wires from the rails corresponding to the pins on the ultrasonic sensor.

Step 3: Connect The Arduino To Appropriate Pins

Hc-sr04 Ultrasonic Distance Sensor
Connect the trig. Pin to pin 12 on the arduino and the echo pin to pin 11 and connect the negative and positive pins to the negative and positive rails on the breadboard.

Step 4: Connect Negative And Positive Pins

Hc-sr04 Ultrasonic Distance Sensor
Connect the negative rail on the breadboard to the negative pin on the arduino and the positive rail on the breadboard to the 5 volt pin on the arduino.

Step 5: Get NewPing Library

NewPing library: https://code.google.com/p/arduino-new-ping/

Step 6: Upload Test Code

Hc-sr04 Ultrasonic Distance Sensor


#include
#define TRIGGER_PIN 12;
#define ECHO_PIN 11;
#define MAX_DISTANCE 200;

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

void setup() {
Serial.begin(115200);
}

void loop() {
delay(50);
unsigned int uS = sonar.ping();
Serial.print("Ping: ");
Serial.print(uS / US_ROUNDTRIP_CM);
Serial.println("cm");
}

Step 7: Test By Using Serial Monitor

Hc-sr04 Ultrasonic Distance Sensor
Open the serial monitor in the arduino IDE and Set the baud rate to 115200 and move your hand in front of the sensor and look at the serial monitor you should see the distance change on the serial monitor.

Step 8: Going Further... Adding An Led

Hc-sr04 Ultrasonic Distance Sensor

If you want to use an led to indicate the distance you can connect an led to pin 13 and negative and upload this code:
// ---------------------------------------------------------------------------
// Example NewPing library sketch that does a ping about 20 times per second.
// ---------------------------------------------------------------------------
#define ledPin 13
#include

#define TRIGGER_PIN 12 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN 11 // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

void setup() {
pinMode (ledPin, OUTPUT);
Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results.
}

void loop() {
delay(50); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
unsigned int uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).
Serial.print("Ping: ");
Serial.print(uS / US_ROUNDTRIP_CM); // Convert ping time to distance in cm and print result (0 = outside set distance range)
Serial.println("cm");

if (uS / US_ROUNDTRIP_CM > 20) { // This is where the LED On/Off happens
digitalWrite(ledPin,HIGH); // When the Red condition is met, the Green LED should turn off

}
else {
digitalWrite(ledPin,LOW);

}
if (uS / US_ROUNDTRIP_CM = 0){

}
else {
Serial.print(uS / US_ROUNDTRIP_CM);
Serial.println(" cm");
}
delay(500);
}

 
 

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