Sonar Sensor - දුර මනින සංවේදකය

Sonar Sensor කියන්නෙ ඉතින් Arduino එකෙන් Robots හදන්න කැමති අයට නැතුවම බැරි දෙයක්නෙ. ඔන්න එහෙනම් ගෙනාවා ඒ ගැන ලිපියක්.

මුලින්ම වයර් අමුනගන්න පහත ආකාරයට.

මෙන්න Code එක.

const int trigPin = 2;


const int echoPin = 4;


 


void setup() {


// initialize serial communication:


Serial.begin(9600);


}


 


void loop()


{


// establish variables for duration of the ping, 


// and the distance result in inches and centimeters:


long duration, inches, cm;


 


// The sensor is triggered by a HIGH pulse of 10 or more microseconds.


// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:


pinMode(trigPin, OUTPUT);


digitalWrite(trigPin, LOW);


delayMicroseconds(2);


digitalWrite(trigPin, HIGH);


delayMicroseconds(10);


digitalWrite(trigPin, LOW);


 


// Read the signal from the sensor: a HIGH pulse whose


// duration is the time (in microseconds) from the sending


// of the ping to the reception of its echo off of an object.


pinMode(echoPin, INPUT);


duration = pulseIn(echoPin, HIGH);


 


// convert the time into a distance


inches = microsecondsToInches(duration);


cm = microsecondsToCentimeters(duration);




Serial.print(inches);


Serial.print("in, ");


Serial.print(cm);


Serial.print("cm");


Serial.println();




delay(100);


}


 


long microsecondsToInches(long microseconds)


{


// According to Parallax's datasheet for the PING))), there are


// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per


// second).  This gives the distance travelled by the ping, outbound


// and return, so we divide by 2 to get the distance of the obstacle.


// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf


return microseconds / 74 / 2;


}


 


long microsecondsToCentimeters(long microseconds)


{


// The speed of sound is 340 m/s or 29 microseconds per centimeter.


// The ping travels out and back, so to find the distance of the


// object we take half of the distance travelled.


return microseconds / 29 / 2;


}

දැන් Serial Monitor එක දාලා බලන්න සංවේදකයෙන් දුර මනින ආකාරය.