WiFi with ESP8266/ESP32 in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the WiFi.begin(ssid, password) function in ESP8266/ESP32 programming?

It starts the WiFi connection process by trying to connect the ESP device to the specified WiFi network using the given SSID and password.

beginner

How can you check if the ESP8266/ESP32 is connected to WiFi?

Use WiFi.status() == WL_CONNECTED. If true, the device is connected to the WiFi network.

beginner

What does WiFi.localIP() return?

It returns the IP address assigned to the ESP device by the WiFi network, which you can use to communicate with it.

intermediate

Why is it important to include delay() or yield() inside the WiFi connection loop?

Because it allows the ESP to handle background tasks and prevents the watchdog timer from resetting the device during connection attempts.

intermediate

What is the difference between WiFi.begin() and WiFi.config()?

WiFi.begin() connects to a WiFi network using DHCP by default. WiFi.config() lets you set a static IP address, gateway, and subnet before connecting.

Which function starts the WiFi connection on ESP8266/ESP32?

A WiFi.open()

B WiFi.connect()

C WiFi.start()

D WiFi.begin(ssid, password)

The correct function to start connecting to a WiFi network is WiFi.begin(ssid, password).

How do you check if the ESP device is connected to WiFi?

A WiFi.connected()

B WiFi.isConnected()

C WiFi.status() == WL_CONNECTED

D WiFi.check()

WiFi.status() returns the connection status. WL_CONNECTED means the device is connected.

What does WiFi.localIP() provide?

A The IP address assigned to the device

B The password of the WiFi network

C The SSID of the connected network

D The MAC address of the device

WiFi.localIP() returns the IP address assigned to the ESP device by the router.

Why should you use delay() or yield() inside the WiFi connection loop?

A To prevent the watchdog timer from resetting the device

B To speed up the connection

C To disconnect from WiFi

D To save battery power

Including delay() or yield() lets the ESP handle background tasks and avoids watchdog resets.

What is the purpose of WiFi.config()?

A To disconnect from WiFi

B To set a static IP address before connecting

C To start the WiFi connection

D To scan available networks

WiFi.config() lets you set a static IP, gateway, and subnet before connecting to WiFi.

Explain the steps to connect an ESP8266 or ESP32 to a WiFi network using Arduino code.

Think about how you start, check, and confirm the WiFi connection.

Describe the difference between using DHCP and static IP configuration on ESP8266/ESP32 WiFi connection.

Consider how the device gets its IP address.