P2 Servo, ESP32 dan Web Server

Pendahuluan

Pada percobaan ini, akan dilakukan pengontrolan pergerakan servo berbasis web.

Kegiatan 1 : Persiapan Rangkaian Servo dengan ESP32

Kegiatan 1 : Persiapkan Rangkaian Servo dengan ESP32

a. GND servo (kabel Coklat) ke GND ESP32

b. Power servo (Kebel Merah) ke 3.3v /5 v ESP32

c. Signal servo (Kabel Kuning) ke GPIO13

Kegiatan 2 : Install ESP32 Arduino Servo Library

Kegiatan 2 : Menginstal ESP32 Arduino Servo Library

Langkah-langkah untuk menginstal library di Arduino IDE Anda

Klik di sini untuk mengunduh library 2. Buka zip folder, Anda akan mendapatkan folder ESP32-Arduino-ServoLibrary-Master\
Ganti nama folder Anda menjadi ESP32_Arduino_Servo_Library
Pindahkan folder ESP32_Arduino_Servo_Library ke folder library instalasi Arduino IDE Anda
Terakhir, buka kembali Arduino IDE Anda

Kegiatan 3 : Uploud Sketch/Kode Program

Kegiatan 3 : Menguploud Sketch/kode program

a. Kode Program sebagai berikut :

/*********

Servo, ESP32 dengan Web Server

*********/

#include <WiFi.h>

#include <Servo.h>

Servo myservo; // create servo object to control a servo

// twelve servo objects can be created on most boards

// GPIO the servo is attached to

static const int servoPin = 13;

// Replace with your network credentials

const char* ssid = "Rifqi's Galaxy A50s";

const char* password = "rifqites";

// Set web server port number to 80

WiFiServer server(80);

// Variable to store the HTTP request

String header;

// Decode HTTP GET value

String valueString = String(5);

int pos1 = 0;

int pos2 = 0;

// Current time

unsigned long currentTime = millis();

// Previous time

unsigned long previousTime = 0;

// Define timeout time in milliseconds (example: 2000ms = 2s)

const long timeoutTime = 2000;

void setup() {

Serial.begin(115200);

myservo.attach(servoPin); // attaches the servo on the servoPin to the servo object

// Connect to Wi-Fi network with SSID and password

Serial.print("Connecting to ");

Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

// Print local IP address and start web server

Serial.println("");

Serial.println("WiFi connected.");

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

server.begin();

}

void loop(){

WiFiClient client = server.available(); // Listen for incoming clients

if (client) { // If a new client connects,

currentTime = millis();

previousTime = currentTime;

Serial.println("New Client."); // print a message out in the serial port

String currentLine = ""; // make a String to hold incoming data from the client

while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected

currentTime = millis();

if (client.available()) { // if there's bytes to read from the client,

char c = client.read(); // read a byte, then

Serial.write(c); // print it out the serial monitor

header += c;

if (c == '\n') { // if the byte is a newline character

// if the current line is blank, you got two newline characters in a row.

// that's the end of the client HTTP request, so send a response:

if (currentLine.length() == 0) {

// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)

// and a content-type so the client knows what's coming, then a blank line:

client.println("HTTP/1.1 200 OK");

client.println("Content-type:text/html");

client.println("Connection: close");

client.println();

// Display the HTML web page

client.println("<!DOCTYPE html><html>");

client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");

client.println("<link rel=\"icon\" href=\"data:,\">");

// CSS to style the on/off buttons

// Feel free to change the background-color and font-size attributes to fit your preferences

client.println("<style>body { text-align: center; font-family: \"Trebuchet MS\", Arial; margin-left:auto; margin-right:auto;}");

client.println(".slider { width: 300px; }</style>");

client.println("<script src=\"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js\"></script>");

// Web Page

client.println("</head><body><h1>ESP32 with Servo</h1>");

client.println("<p>Position: <span id=\"servoPos\"></span></p>");

client.println("<input type=\"range\" min=\"0\" max=\"180\" class=\"slider\" id=\"servoSlider\" onchange=\"servo(this.value)\" value=\""+valueString+"\"/>");

client.println("<script>var slider = document.getElementById(\"servoSlider\");");

client.println("var servoP = document.getElementById(\"servoPos\"); servoP.innerHTML = slider.value;");

client.println("slider.oninput = function() { slider.value = this.value; servoP.innerHTML = this.value; }");

client.println("$.ajaxSetup({timeout:1000}); function servo(pos) { ");

client.println("$.get(\"/?value=\" + pos + \"&\"); {Connection: close};}</script>");

client.println("</body></html>");

//GET /?value=180& HTTP/1.1

if(header.indexOf("GET /?value=")>=0) {

pos1 = header.indexOf('=');

pos2 = header.indexOf('&');

valueString = header.substring(pos1+1, pos2);

//Rotate the servo

myservo.write(valueString.toInt());

Serial.println(valueString);

}

// The HTTP response ends with another blank line

client.println();

// Break out of the while loop

break;

} else { // if you got a newline, then clear currentLine

currentLine = "";

}

} else if (c != '\r') { // if you got anything else but a carriage return character,

currentLine += c; // add it to the end of the currentLine

}

// Clear the header variable

header = "";

// Close the connection

client.stop();

Serial.println("Client disconnected.");

Serial.println("");

}

b. Uploud ke ESP32 Anda

Kegiatan 4 : Menghubungkan Device Browser dalam 1 Akses Point ESP32

perhatikan :

const char* ssid = "Rifqi's Galaxy A50s";

const char* password = "rifqites";

didalam program yang anda uploud, anda diminta untuk menginputkan ssid / identitas akses point yang anda akan gunakan dan pasword akses point anda.

Skema koneksi web server adalah sebagai berikut :

Kegiatan 5 : Amati dan lengkapi tabel percobaan

Amati dan lengkapi Tabel Pengamatan Berikut (gunakan busur untuk mengukur derajat putaran pada poros servo (minimal 5 percobaan)