🌡️ Pull Request: Add DHT22 Temperature Monitoring with ESP32 & ThingSpeak

Domains/IoT/MiniProjects/DHT22+ESP32/code.ino

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+#include <DHT.h>
+#define dataPin  4
+#define DHTTYPE DHT22
+#include <WiFi.h> 
+#define WIFI_SSID "Wokwi-GUEST" 
+#define WIFI_PASSWORD "" 
+#include "ThingSpeak.h" 
+#define myChannelNumber [Give your channel no u created at thing speak]
+#define myWriteAPIKey ["Give your API key"] 
+unsigned long dataMillis = 0; 
+int data1;
+WiFiClient client; 
+DHT dht(dataPin , DHTTYPE);
+
+void setup() {
+  Serial.begin(115200);
+  dht.begin();
+  // put your setup code here, to run once:
+  WiFi.begin (WIFI_SSID,WIFI_PASSWORD); 
+  ThingSpeak.begin(client);
+
+
+  Serial .print("Connecting to Wi-Fi"); 
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500); 
+    Serial.print("-"); 
+  }
+}
+
+void loop() {
+   data1 = dht.readTemperature(); 
+
+
+  // put your main code here, to run repeatedly:
+  ThingSpeak.setField(1, data1); 
+   if (millis() - dataMillis > 20000) 
+  { 
+    Serial.printf("data1 value: %.2f\n", data1); 
+
+    int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey); 
+    if ( x == 200){ 
+    Serial.println("Channel update successful."); 
+    } 
+    else{ 
+    Serial.println("Problem updating channel. HTTP error code " + String(x)); 
+  } 
+  } 
+
+
+  delay(200);
+
+}

Domains/IoT/MiniProjects/DHT22+ESP32/readme.md

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+# 🌡️ DHT22 Temperature Monitoring with ESP32 & ThingSpeak
+
+This project connects a **DHT22 temperature sensor** to an **ESP32** and uploads real-time data to **ThingSpeak** over Wi-Fi.  
+You can visualize the temperature readings online in your ThingSpeak channel dashboard.
+
+---
+
+## 🧠 Project Overview
+
+The **DHT22 sensor** measures the temperature, and the **ESP32** sends the readings to **ThingSpeak** via the internet every 20 seconds.  
+This setup is useful for IoT-based environmental monitoring, weather stations, or smart home systems.
+
+---
+
+## ⚙️ Components Required
+
+- ESP32 board  
+- DHT22 Sensor  
+- Jumper Wires  
+- Breadboard  
+- Internet connection  
+
+---
+
+## 🔌 Circuit Connections
+
+| DHT22 Pin | ESP32 Pin |
+|------------|------------|
+| VCC        | 3.3V       |
+| DATA       | GPIO 4     |
+| GND        | GND        |
+
+---
+
+Author 
+
+Shirsha Nag
+
+Contributor