Enterprise Internet of Things Handbook

SPI

The Serial Peripheral Interface (SPI) protocol allows a sensor and a controller to exchange data via two communication lines. SPI is a bus which supports multiple sensors or actuators being controlled on a single bus. The protocol uses three pins connected between the sensor and controller.

For example, the Bosch BME280 temperature humidity pressure sensor supports the SPI protocol to communicate between the controller and sensor. Read more about BME280 here: https://www.bosch-sensortec.com/bst/products/all_products/bme280.