Arduino for beginners and professional

for temp and humidity
UNO r2 wifi



=========Code========




DHTPIN 2
DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x3F, 16, 2);

void setup() {
Wire.begin();
lcd.begin(16,2); // Initialize the LCD
lcd.backlight(); // Turn on the backlight
dht.begin(); // Initialize the DHT sensor
}

void loop() {
delay(1000); // Wait a few seconds between measurements

float h = dht.readHumidity(); // Read humidity
float t = dht.readTemperature(); // Read temperature in Celsius

// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t)) {
lcd.setCursor(0, 0);
lcd.print("Failed to read");
lcd.setCursor(0, 1);
lcd.print("from DHT sensor!");
return;
}

// Display the temperature and humidity on the LCD
lcd.setCursor(0, 0);
lcd.print("Temp: ");
lcd.print(t);
lcd.print(" C");

lcd.setCursor(0, 1);
lcd.print("Humidity: ");
lcd.print(h);
lcd.print(" %");
}

=====Code end======

# inbuilt led control over webpage
# Arduino UNO r2 wifi


===≠========code==========
// Include the WiFiNINA library

// Replace with your network credentials
const char* ssid = "your ssid"; // Your WiFi
SSID
const char* password = "your password"; // Your WiFi password

WiFiServer server(80); // Create a server on port 80

// Pin where the LED is connected
const int ledPin = 8;

void setup() {
// Initialize serial communication
Serial.begin(9600);

// Set the LED pin as an output
pinMode(LED_BUILTIN, OUTPUT);
digitalWrite(LED_BUILTIN, LOW); // Ensure LED is off initially

// Connect to Wi-Fi
Serial.print("Connecting to Wi-Fi");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print(".");
}
Serial.println("\nConnected to Wi-Fi");

// Start the server
server.begin();
Serial.println("Server started");

// Print the IP address
Serial.print("IP Address: ");
Serial.println(WiFi.localIP());
}

void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (client) {
Serial.println("New client connected");

// Read the first line of the request
String request = client.readStringUntil('\r');
Serial.println(request);
client.flush();

// Match the request
if (request.indexOf("GET /LED=ON") != -1) {
digitalWrite(LED_BUILTIN, HIGH); // Turn LED on
} else if (request.indexOf("GET /LED=OFF") != -1) {
digitalWrite(LED_BUILTIN, LOW); // Turn LED off
}

// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close");
client.println();

// HTML content for the webpage
client.println("");
client.println("");
client.println("Arduino LED Control");
client.println("");
client.println("LED Control");
client.println("Click to control the LED:");
client.println("ON");
client.println("OFF");
client.println("");
client.println("");

delay(1000); // Give the web browser time to receive the data
client.stop(); // Close the connection
Serial.println("Client disconnected");
}
}

=======Code end==========

to wifi using inbuilt wifi on UNO r2
to develop wifi application
tuned for further interesting application over wifi

Billing system with raspberry pi 4
Thermal printer+ barcode scanner+ gsm module
With python script