WiFi with ESP8266/ESP32 in Arduino - Step-by-Step Execution

Concept Flow - WiFi with ESP8266/ESP32

Start

↓

Include WiFi library

↓

Set WiFi SSID and Password

↓

Begin WiFi connection

↓

Check connection status

↓

Connected

↓

Use WiFi connection

↓

End

This flow shows how the ESP connects to WiFi: include library, set credentials, start connection, check status, retry if needed, then use connection.

Execution Sample

Arduino

#include <WiFi.h>
const char* ssid = "MyWiFi";
const char* password = "pass1234";
void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
}
void loop() {}

This code starts WiFi connection on ESP32/ESP8266 using given network name and password.

Execution Table

Step	Action	WiFi Status	Output
1	Include WiFi library	Disconnected	No output
2	Set SSID and Password	Disconnected	No output
3	Call WiFi.begin(ssid, password)	Connecting	No output
4	Check WiFi.status()	Connecting	No output
5	Wait and retry	Connecting	No output
6	Check WiFi.status()	Connected	Connected to MyWiFi
7	Use WiFi connection	Connected	Ready for network tasks
8	Loop continues	Connected	No output

💡 WiFi.status() returns WL_CONNECTED, connection established successfully

Variable Tracker

Variable	Start	After Step 3	After Step 6	Final
WiFi.status()	Disconnected	Connecting	Connected	Connected
ssid	"MyWiFi"	"MyWiFi"	"MyWiFi"	"MyWiFi"
password	"pass1234"	"pass1234"	"pass1234"	"pass1234"

Key Moments - 2 Insights

Why does WiFi.status() return CONNECTING before it returns CONNECTED?

Because the ESP is trying to connect to the network; it takes some time to establish the connection as shown in steps 4 and 5 of the execution table.

What happens if the SSID or password is wrong?

The WiFi.status() will never return CONNECTED, it will stay in CONNECTING or eventually fail, so the code should handle retries or errors (not shown in this simple example).

Visual Quiz - 3 Questions

Look at the execution table, what is WiFi.status() at step 5?

A Connected

B Disconnected

C Connecting

D Failed

💡 Hint

Check the 'WiFi Status' column at step 5 in the execution table.

At which step does the ESP successfully connect to WiFi?

A Step 3

B Step 6

C Step 4

D Step 8

💡 Hint

Look for the step where WiFi.status() changes to Connected in the execution table.

If the password is incorrect, how would the variable tracker change?

A WiFi.status() would stay Connecting and never become Connected

B WiFi.status() would stay Disconnected

C WiFi.status() would become Connected immediately

D ssid variable would change

💡 Hint

Refer to the variable tracker and key moments about connection status when credentials are wrong.

Concept Snapshot

WiFi with ESP8266/ESP32:
- Include WiFi library
- Set SSID and password
- Call WiFi.begin(ssid, password)
- Check WiFi.status() until WL_CONNECTED
- Use connection for network tasks
- Handle retries if connection fails

Full Transcript

This visual execution shows how an ESP8266 or ESP32 connects to WiFi. First, the WiFi library is included. Then, the network name (SSID) and password are set. The program calls WiFi.begin() to start connecting. The WiFi.status() is checked repeatedly: it starts as Disconnected, then Connecting, and finally Connected when successful. If the credentials are wrong, the device stays Connecting or fails. Once connected, the ESP can use the network. Variables like WiFi.status() change over time, reflecting connection progress. This step-by-step helps beginners see how WiFi connection works on ESP devices.