Sensor Data Input

Projects General Guidance
4

const int trigPin = 7;

const int echoPin = 8;

void setup() {

Serial.begin(9600);
pinMode(4, OUTPUT);
}
void loop()

{

long duration, inches, cm;

pinMode(trigPin, OUTPUT);

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

pinMode(echoPin, INPUT);

duration = pulseIn(echoPin, HIGH);

inches = microsecondsToInches(duration);

cm = microsecondsToCentimeters(duration);

Serial.print(cm);

Serial.print("cm");

Serial.println();

delay(1000);

if (cm > 52)
{
digitalWrite (4,HIGH);
}

else if (cm < 46)

{
digitalWrite(4,LOW);
}

}

long microsecondsToInches(long microseconds)

{return microseconds / 74 / 2;

}

long microsecondsToCentimeters(long microseconds)

{return microseconds / 29 / 2;}

This is the code i am using in which i have to feed the centimeter limits in the if statement from the code itself .

but i want to put the centimeter limit by using a matrix keyboard.

Kindly help me with the modified code