IOT and networking devices :

Assignment:

1.Control a board from a local wireless network. Program a microcontroller to obtain and respond to information from the internet. Optionally, work with a partner to control a device over a remote server.

For this assignment I am controlling a buzzer and a LED with esp 32 over local server.

I have attaached the photo of the following.

1. Circuit
3. code
4. Video
5. Website screenshot

photo of the circuit:

Screenshot of the code

Video of the circuit

Code for copy-paste

#include
const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";
WiFiServer server(80);
String header;
String output26State = "off";
String output27State = "off";
const int output26 = 26;
const int output27 = 27;
unsigned long currentTime = millis();
unsigned long previousTime = 0;
const long timeoutTime = 2000;
void setup() {
Serial.begin(115200);
pinMode(output26, OUTPUT);
pinMode(output27, OUTPUT);
digitalWrite(output26, LOW);
digitalWrite(output27, LOW);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}

void loop(){
WiFiClient client = server.available();
if (client) {
currentTime = millis();
previousTime = currentTime;
Serial.println("New Client.");
String currentLine = "";
while (client.connected() && currentTime - previousTime <= timeoutTime) {
currentTime = millis();o read from the client,
char c = client.read();
Serial.write(c);
header += c;
if (client.available()) {
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("GET /26/on") >= 0) {
Serial.println("GPIO 26 on");
output26State = "on";
digitalWrite(output26, HIGH);
} else if (header.indexOf("GET /26/off") >= 0) {
Serial.println("GPIO 26 off");
output26State = "off";
digitalWrite(output26, LOW);
} else if (header.indexOf("GET /27/on") >= 0) {
Serial.println("GPIO 27 on");
output27State = "on";

digitalWrite(output27, HIGH);
} else if (header.indexOf("GET /27/off") >= 0) {
Serial.println("GPIO 27 off");
output27State = "off";
digitalWrite(output27, LOW);
}
// Display the HTML web page
client.println(""); client.println("");
client.println("");
client.println("");
client.println
client.println("
GPIO 26 - State " + output26State + "
");
if (output26State=="off") {
client.println("
ON

");
} else {
client.println("
OFF
");
}

client.println("
GPIO 27 - State " + output27State + "
");

if (output27State=="off") {
client.println("
ON

");
} else {
client.println("
OFF

");
}
client.println("");

client.println();

break;
} else {
currentLine = "";
} } else if (c != '\r') {
currentLine += c;
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}
Website screenshot:

Website screenshot: