Regresa a codigos

/*
**  HC-SR04 Ping distance sensor:
** VCC to arduino 5v 
** GND to arduino GND
** Echo to Arduino pin 7 
** Trig to Arduino pin 8
*/

#define echoPin 7 // Echo Pin
#define trigPin 8 // Trigger Pin
#define LEDPin 13 // Onboard LED

int maximumRange = 200; // Maximum range needed
int minimumRange = 0; // Minimum range needed
long duration, distance; // Duration used to calculate distance

void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(LEDPin, OUTPUT); // Use LED indicator (if required)
}

void loop() {
/* The following trigPin/echoPin cycle is used to determine the
 distance of the nearest object by bouncing soundwaves off of it. */
 digitalWrite(trigPin, LOW);
 delayMicroseconds(2);

 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10);
 
 digitalWrite(trigPin, LOW);
 duration = pulseIn(echoPin, HIGH);
 
 //Calculate the distance (in cm) based on the speed of sound.
 distance = duration/58.2;
 
 if (distance >= maximumRange || distance <= minimumRange){
   /* Send a negative number to computer and Turn LED ON 
   to indicate "out of range" */
   Serial.println("-1");
   digitalWrite(LEDPin, HIGH); 
 }
 else {
   /* Send the distance to the computer using Serial protocol, and
   turn LED OFF to indicate successful reading. */
   Serial.println(distance);
   digitalWrite(LEDPin, LOW); 
 }
 
 //Delay 50ms before next reading.
 delay(50);
}