The WIZ850io is a compact Ethernet network module featuring the W5500 chip. It can be easily connected to Raspberry Pi Pico, Espressif microcontrollers like ESP32, ESP32C3, ESP32C6, ESP8266, or Arduino boards via SPI. With this module you can connect microcontroller to the Internet using a cable connection. SPI (Serial Peripheral Interface) is a synchronous serial communication protocol used for short-distance communication, primarily in embedded systems. It enables data transfer between a master device (such as a microcontroller) and one or more peripheral devices. It is a four-Wire interface: - MISO (Master In Slave Out): Carries data from the slave to the master. - MOSI (Master Out Slave In): Carries data from the master to the slave. - SCLK (Serial Clock): Generated by the master to synchronize data transfer. - SS (Slave Select): Selects which slave device the master communicates with.