How to connect Arduino to Internet for IoT?

 In the world of Internet of Things (IoT) development, Arduino has emerged as a popular choice for enthusiasts and professionals alike due to its versatility and ease of use. One of the key capabilities of Arduino is its ability to connect to the internet, opening up a world of possibilities for remote monitoring, control, and data exchange for building Arduino based IoT projects. In this blog post, we'll explore three methods for connecting Arduino to the internet: using the Arduino Ethernet Shield, WiFi Shield, and Arduino Yun. We'll also compare their price and performance to help you choose the best option for your project.

1. Arduino Ethernet Shield:

The Arduino Ethernet Shield allows Arduino boards to connect to the internet using wired Ethernet connections. It features a Wiznet W5100 Ethernet controller and provides a standard RJ45 Ethernet jack for connecting to the local network. Setting up the Ethernet Shield involves connecting it to the Arduino board and configuring network settings using the Ethernet library.

ethernet shield

 Price: The Arduino Ethernet Shield is relatively affordable, typically costing around $10 to $20, depending on the vendor and region.

Performance: The Ethernet Shield offers reliable and stable internet connectivity, making it suitable for applications where a wired connection is preferred or where WiFi signals may be unreliable or unavailable.

2. WiFi Shield:

The WiFi Shield enables Arduino boards to connect to WiFi networks, offering flexibility and convenience for wireless IoT applications. It typically includes an onboard WiFi module, such as the ESP8266 or ESP32, and connects to the Arduino board via SPI communication. Setting up the WiFi Shield involves configuring network credentials and using the appropriate libraries for WiFi communication.

arduino wifi shield

Price: WiFi Shields vary in price depending on factors such as the type of WiFi module used and additional features. Generally, they range from $15 to $30 or more.

Performance: WiFi Shields provide the convenience of wireless connectivity, making them ideal for applications where mobility or placement flexibility is required. However, they may be susceptible to signal interference or range limitations depending on the environment.

3. Arduino Yun:

The Arduino Yun is a unique Arduino board that combines the capabilities of a traditional Arduino microcontroller with a Linux-based processor and built-in WiFi connectivity. This combination allows the Arduino Yun to run Arduino sketches while also supporting advanced networking and communication features. The Arduino Yun features a dedicated Atheros AR9331 WiFi system-on-chip (SoC) for WiFi connectivity.

arduino yun
 Price: The Arduino Yun is priced higher compared to traditional Arduino boards and shields, typically ranging from $50 to $70.

Performance: The Arduino Yun offers the best of both worlds, providing the flexibility of Arduino programming combined with the power of Linux-based networking. It's well-suited for projects that require advanced internet connectivity features or integration with web services.


  • Price: Arduino Ethernet Shield is the most budget-friendly option, followed by WiFi Shields, with Arduino Yun being the most expensive.

  • Performance: Ethernet Shields offer reliable wired connectivity, WiFi Shields provide the flexibility of wireless communication, and Arduino Yun combines Arduino programming with advanced networking capabilities.

In conclusion, the choice between Arduino Ethernet Shield, WiFi Shield, or Arduino Yun depends on factors such as project requirements, budget, and preferred connectivity method. Whether you opt for wired or wireless connectivity, Arduino provides versatile solutions for connecting your projects to the internet, opening up endless possibilities for IoT innovation.

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