//#define CAYENNE_DEBUG         // Uncomment to show debug messages
#define CAYENNE_PRINT Serial  // Comment this out to disable prints and save space
#include "CayenneDefines.h"
#include "BlynkSimpleEsp8266.h"
#include "CayenneWiFiClient.h"



#define echoPin 5 // Echo Pin
#define trigPin 4 // Trigger Pin
#define VIRTUAL_PIN V1


// Cayenne authentication token. This should be obtained from the Cayenne Dashboard.
char token[] = "token";
// Your network name and password.
char ssid[] = "ssid";
char password[] = "password";

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);
  Cayenne.begin(token, ssid, password);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
}

void loop()
{
  Cayenne.run();


  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");
 
 }
 else {
 /* Send the distance to the computer using Serial protocol, and
 turn LED OFF to indicate successful reading. */
 Serial.println(distance);
 
 }
 
 //Delay 50ms before next reading.
 delay(50);  
}

CAYENNE_OUT(VIRTUAL_PIN)
{
  Cayenne.virtualWrite(VIRTUAL_PIN, distance);
}