Skip to content

Instantly share code, notes, and snippets.

@elktros
Created March 17, 2021 11:30
Show Gist options
  • Save elktros/47b1085889566e4211d7101ade4fcc3b to your computer and use it in GitHub Desktop.
Save elktros/47b1085889566e4211d7101ade4fcc3b to your computer and use it in GitHub Desktop.
Code for ESP32 Web Controlled Servo.
#include <WiFi.h>
const int servoPin = 16; /* GPIO16 */
const char* ssid = "ESP32-WiFi"; /* Add your router's SSID */
const char* password = "12345678"; /*Add the password */
int dutyCycle = 0;
//int position1 = 0;
/* Setting PWM properties */
const int PWMFreq = 50;
const int PWMChannel = 0;
const int PWMResolution = 8;
const int MAX_DUTY_CYCLE = (int)(pow(2, PWMResolution) - 1);
WiFiServer espServer(80); /* Instance of WiFiServer with port number 80 */
/* 80 is the Port Number for HTTP Web Server */
/* A String to capture the incoming HTTP GET Request */
String request;
void setup()
{
Serial.begin(115200);
ledcSetup(PWMChannel, PWMFreq, PWMResolution);
/* Attach the LED PWM Channel to the GPIO Pin */
ledcAttachPin(servoPin, PWMChannel);
ledcWrite(PWMChannel, dutyCycle);
Serial.print("\n");
Serial.print("Connecting to: ");
Serial.println(ssid);
WiFi.mode(WIFI_STA); /* Configure ESP32 in STA Mode */
WiFi.begin(ssid, password); /* Connect to Wi-Fi based on the above SSID and Password */
while(WiFi.status() != WL_CONNECTED)
{
Serial.print("*");
delay(100);
}
Serial.print("\n");
Serial.print("Connected to Wi-Fi: ");
Serial.println(WiFi.SSID());
delay(100);
/* The next four lines of Code are used for assigning Static IP to ESP32 */
/* Do this only if you know what you are doing */
/* You have to check for free IP Addresses from your Router and */
/* assign it to ESP32 */
/* If you are comfortable with this step, */
/* please un-comment the next four lines and make necessary changes */
/* If not, leave it as it is and proceed */
//IPAddress ip(192,168,1,6);
//IPAddress gateway(192,168,1,1);
//IPAddress subnet(255,255,255,0);
//WiFi.config(ip, gateway, subnet);
delay(2000);
Serial.print("\n");
Serial.println("Starting ESP32 Web Server for Servo Control...");
espServer.begin(); /* Start the HTTP web Server */
Serial.println("ESP32 Servo Web Server Started");
Serial.print("\n");
Serial.print("The URL of ESP32 Servo Web Server is: ");
Serial.print("http://");
Serial.println(WiFi.localIP());
Serial.print("\n");
Serial.println("Use the above URL in your Browser to access ESP32 Servo Web Server\n");
}
void loop()
{
WiFiClient client = espServer.available(); /* Check if a client is available */
if(!client)
{
return;
}
Serial.println("New Client!!!");
boolean currentLineIsBlank = true;
while (client.connected())
{
if (client.available())
{
char c = client.read();
request += c;
Serial.write(c);
/* If you've gotten to the end of the line (received a newline */
/* character) and the line is blank, the http request has ended, */
/* so you can send a reply */
if (c == '\n' && currentLineIsBlank)
{
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
client.println("<!DOCTYPE html>");
client.println("<html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
/* CSS Styling for Text and Slider */
client.println("<style>body { font-family: \"Courier New\"; margin-left:auto; margin-right:auto; text-align:center;}");
client.println(".slidecontainer { width: 100%;}");
client.println(".slider { -webkit-appearance: none;");
client.println("width: 30%; height: 20px; background: #d3d3d3;");
client.println("outline: none; opacity: 0.7; -webkit-transition: .2s; transition: opacity .2s;}");
client.println(".slider:hover { opacity: 1; }");
client.println(".slider::-webkit-slider-thumb { -webkit-appearance: none;");
client.println("appearance: none; width: 15px; height: 28px;");
client.println("border-radius: 30%; background: #4CAF50; cursor: pointer;}");
client.println(".slider::-moz-range-thumb { width: 25px; height: 25px; background: #4CAF50; cursor: pointer;}</style>");
client.println("<script src=\"https://code.jquery.com/jquery-3.6.0.min.js\"></script>");
/*Actual Web Page */
client.println("</head><body><h2>ESP32 Web Controlled Servo</h2>");
client.println("<p>Drag the slider to rotate the Servo.</p>");
client.println("<input type=\"range\" min=\"0\" max=\"180\" class=\"slider\" id=\"servoRange\" onchange=\"servo(this.value)\"/>");
client.println("<p>Angle: <span id=\"servoPos\"></span></p>");
client.println("<script>");
client.println("var slider = document.getElementById(\"servoRange\");");
client.println("var output = document.getElementById(\"servoPos\");");
client.println("output.innerHTML = slider.value;");
client.println("slider.oninput = function(){output.innerHTML = this.value;}");
client.println("$.ajaxSetup({timeout:1000}); function servo(angle) { ");
client.println("$.get(\"/servovalue=\" + angle); {Connection: close};}</script>");
client.println("</body></html>");
/* The request will be in the form of
* GET /servovalue=143 /HTTP/1.1*/
if(request.indexOf("GET /servovalue=") != -1)
{
int position1 = request.indexOf('='); /* Find out the position of '=' in the request string */
String angleStr = request.substring(position1+1); /* Next 2/3 characters inform the desired angle */
int angleValue = angleStr.toInt();
dutyCycle = map(angleValue, 0, 180, 5, 32);
ledcWrite(PWMChannel, dutyCycle);
}
client.println();
break;
}
if(c == '\n')
{
currentLineIsBlank = true;
}
else if(c != '\r')
{
currentLineIsBlank = false;
}
//client.print("\n");
}
}
delay(1);
request = "";
//client.flush();
client.stop();
Serial.println("Client disconnected");
Serial.print("\n");
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment