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CogWikiEditor: Created page with " = Wi-Fi and TCP/IP Communication Using ESP32 and DHT11 = == Aim == To connect an ESP32 to a Wi-Fi network and transmit temperature and humidity data from a DHT11 sensor to a remote computer using TCP/IP communication. == Components Required == {| class="wikitable" |- ! Sr. No. ! Component ! Quantity |- | 1 | ESP32 Development Board | 1 |- | 2 | DHT11 Sensor | 1 |- | 3 | USB Data Cable | 1 |- | 4 | Patch Cords | As required |- | 5 | Computer with Arduino IDE | 1 |- |..."

2026-10-02T17:07:16Z

Created page with " = Wi-Fi and TCP/IP Communication Using ESP32 and DHT11 = == Aim == To connect an ESP32 to a Wi-Fi network and transmit temperature and humidity data from a DHT11 sensor to a remote computer using TCP/IP communication. == Components Required == {| class="wikitable" |- ! Sr. No. ! Component ! Quantity |- | 1 | ESP32 Development Board | 1 |- | 2 | DHT11 Sensor | 1 |- | 3 | USB Data Cable | 1 |- | 4 | Patch Cords | As required |- | 5 | Computer with Arduino IDE | 1 |- |..."

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= Wi-Fi and TCP/IP Communication Using ESP32 and DHT11 =

== Aim ==

To connect an ESP32 to a Wi-Fi network and transmit temperature and humidity data from a DHT11 sensor to a remote computer using TCP/IP communication.

== Components Required ==

{| class="wikitable"
|-
! Sr. No.
! Component
! Quantity
|-
| 1
| ESP32 Development Board
| 1
|-
| 2
| DHT11 Sensor
| 1
|-
| 3
| USB Data Cable
| 1
|-
| 4
| Patch Cords
| As required
|-
| 5
| Computer with Arduino IDE
| 1
|-
| 6
| Remote Computer
| 1
|}

== Theory ==

An IoT device collects data using sensors and transmits it to other devices through a communication network.

Wi-Fi enables wireless connectivity between the ESP32 and the local network.

TCP/IP is a communication protocol suite used for data exchange between devices.

* '''TCP:''' Provides reliable and ordered data transmission.
* '''IP:''' Provides addressing and routing of data packets.
* '''TCP Client:''' Initiates a connection and sends data.
* '''TCP Server:''' Listens for incoming connections and receives data.

The DHT11 sensor measures temperature and humidity. The ESP32 reads these values and transmits them to a remote computer.

== Pin Connections ==

{| class="wikitable"
|-
! ESP32 Pin
! DHT11 Pin
! Description
|-
| 3V3
| VCC
| Power supply
|-
| GPIO 4
| DATA
| Sensor data
|-
| GND
| GND
| Ground
|}

== Connection Diagram ==

<pre>
DHT11 Sensor
|
| DATA
|
GPIO 4
|
ESP32
|
Wi-Fi
|
Remote Computer
|
TCP Server
</pre>

== Program 1: Python TCP Server ==

Run this program on the remote computer.

<syntaxhighlight lang="python">
import socket

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

server.bind(("0.0.0.0", 5000))
server.listen(1)

print("Waiting for connection...")

while True:
conn, addr = server.accept()
print("Connected:", addr)

with conn:
while True:
data = conn.recv(1024)

if not data:
break

print(data.decode().strip())
</syntaxhighlight>

== Program 2: ESP32 TCP Client ==

Install the DHT sensor library in Arduino IDE before uploading the program.

Replace the Wi-Fi name, password, and server IP address with your own network details.

<syntaxhighlight lang="cpp">
#include <WiFi.h>
#include <DHT.h>

#define DHTPIN 4
#define DHTTYPE DHT11

const char* ssid = "YOUR_WIFI_NAME";
const char* password = "YOUR_WIFI_PASSWORD";

const char* serverIP = "192.168.1.100";
const int serverPort = 5000;

DHT dht(DHTPIN, DHTTYPE);
WiFiClient client;

void setup() {
Serial.begin(115200);
dht.begin();

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}

Serial.println("Wi-Fi Connected");
Serial.println(WiFi.localIP());
}

void loop() {
if (!client.connected()) {
if (!client.connect(serverIP, serverPort)) {
Serial.println("Server connection failed");
delay(3000);
return;
}
}

float t = dht.readTemperature();
float h = dht.readHumidity();

if (!isnan(t) && !isnan(h)) {
client.print("Temperature: ");
client.print(t);
client.print(" C, Humidity: ");
client.print(h);
client.println(" %");

Serial.println("Data transmitted");
}

delay(3000);
}
</syntaxhighlight>

== Procedure ==

# Connect the DHT11 sensor to the ESP32.
# Connect the ESP32 to the computer using a USB cable.
# Open Arduino IDE and select the appropriate ESP32 board and COM port.
# Install the DHT sensor library.
# Enter the Wi-Fi credentials and remote computer IP address.
# Run the Python TCP server on the remote computer.
# Upload the ESP32 program.
# Open the Serial Monitor at 115200 baud.
# Observe the temperature and humidity readings transmitted to the remote computer.

== Expected Output ==

'''ESP32 Serial Monitor'''

<pre>
Wi-Fi Connected
192.168.1.105
Data transmitted
Data transmitted
Data transmitted
</pre>

'''Remote Computer'''

<pre>
Waiting for connection...
Connected: ('192.168.1.105', 50000)
Temperature: 28.0 C, Humidity: 65.0 %
Temperature: 28.0 C, Humidity: 64.0 %
</pre>

The values shown are illustrative examples.

== Result ==

The ESP32 was configured to connect to a Wi-Fi network and transmit DHT11 temperature and humidity readings to a remote computer using TCP/IP communication.

== Viva Questions ==

# What is Wi-Fi?
# What is TCP/IP?
# What is the difference between TCP and UDP?
# What is a TCP client?
# What is a TCP server?
# What is the role of an IP address?
# What is the function of the DHT11 sensor?
# What is the purpose of the WiFiClient class?
# Why is TCP considered reliable?
# How can sensor data be sent to an IoT cloud platform?

MDM331AID/Experiment 5 - Revision history

CogWikiEditor at 00:54, 8 October 2026

CogWikiEditor at 16:27, 7 October 2026

CogWikiEditor at 17:15, 2 October 2026