#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <Servo.h>

// WiFi parameters
const char* ssid = "SSID_HERE";
const char* password = "PWD HERE";

//use http port
#define LISTEN_PORT           80

// Create an instance of the server
WiFiServer server(LISTEN_PORT);

Servo myservo;
int pos;//servo position

void setup(void)
{
  // Start Serial
  Serial.begin(115200);

  //connect wifi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  //start server
  server.begin();
  Serial.println("ESP8266 Server started");

  //
  Serial.println(WiFi.localIP());
  myservo.attach(4);//GPIO4
}

void loop() {
  //examples->servo->sweep
  WiFiClient client = server.available();
   if (!client) {
    return;
  }
  while(!client.available()){
    delay(1);
  }
  if (client) {
     Serial.println("Client connected");
    while (client.connected()) {
      if (client.available()) {
        if (client.read() == '1') {
          for (pos = 0; pos <= 180; pos += 1)
          {
            myservo.write(pos);
            delay(15);
          }
          for (pos = 180; pos >= 0; pos -= 1)
          {
            myservo.write(pos);
            delay(15);
          }
        }
      }
    }
    client.stop();


  }
}