Arduino for Beginners · Sensors, I2C/SPI buses and the final project
A brief look at SPI and what next: ESP32/WiFi/IoT as a preview
Sensors, I2C/SPI buses and the final project
Introduction
The final lesson of the chapter closes the topic of buses: you briefly meet SPI (four lines MOSI, MISO, SCK, SS/CS, full-duplex communication, master-slave) and compare it with I2C — when to pick which. The second half previews the next step: the ESP32 with built-in WiFi and Bluetooth, 3.3V logic, station and access point modes, and the basics of IoT (sending data via HTTP/MQTT, deep sleep). It is an introductory overview, without writing full code.