distance_sensor_for_esp1_StationPoint.ino

//Author: Vivekanand Dhakane
//Updated on: 28/4/2020

#include <ESP8266WiFi.h>

#define trigPin 0                 //trig Pin to GPIO0
#define echoPin 2                 //Echo Pin to GPIO2
int count;
////////////////
char ssid[] = "ShriRamNiwas";           // SSID of your AP
char pass[] = "password";         // password of your AP
IPAddress server(192, 168, 4, 15);  // IP address of the AP
WiFiClient client;
////////////////
int Total_dist;
double present_time, diff, last_time;
void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  ////////////////////
  WiFi.mode(WIFI_STA);              // starting ESP in Station Point Mode
  WiFi.begin(ssid, pass);           // connects to the WiFi AP
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
}

void loop() {

  float duration, distance;
  last_time = present_time;
  present_time = millis();
  diff = present_time - last_time;

  //Send pulse on trig Pin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(1000);
  digitalWrite(trigPin, LOW);
  //wait for echo
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;

  //digitalWrite(control, LOW);

  if (distance >= 200 || distance <= 0) {
    Serial.println("Out of range");
  }
  else {
    Serial.print(distance);
    Serial.println("cm");
    Serial.print(duration);
    Serial.println("s");
    
    //sending Message to server
    client.connect(server, 80);
    client.print("Tk" + (String)distance + "\r"); //sending message format "Tk65\r"
    client.flush();
    client.stop();


  }
  delay(10000); //Delay of 10 seconds

}