arduino_http_servo.ino

// Most of this code came from https://randomnerdtutorials.com/esp8266-web-server-with-arduino-ide/

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

const char* ssid     = "NiceTry";
const char* password = "ImNotStupid";

Servo servo;

WiFiServer server(80);

String header;

void setup() {
  Serial.begin(9600);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
  
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();
}

void RunServo(int angle) {
  if (angle == 90 && servo.attached()) {
    servo.write(89);
    delay(1000);
    servo.detach();  
  } else if (angle != 90) {
    if (!servo.attached()) {
      // Attach the servo to D4.
      servo.attach(2);
      delay(1000);
    }
    servo.write(angle);
  }
}

void loop(){
  WiFiClient client = server.available();

  if (client) {
    String currentLine = "";
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        header += c;
        if (c == '\n') {
          if (currentLine.length() == 0) {
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();

            if (header.indexOf("/left") > 0) {
              client.println("Servo-state: left");
              RunServo(180);
            } else if (header.indexOf("/right") > 0) {
              client.println("Servo-state: right");
              RunServo(0);
            } else if (header.indexOf("/off") > 0) {
              client.println("Servo-state: off");
              RunServo(90);
            }
            
            client.println();
            break;
          } else {
            currentLine = "";
          }
        } else if (c != '\r') {
          currentLine += c;
        }
      }
    }
    header = "";
    client.stop();
  }
}