External Devices
External devices extend the capabilities of the Circuit Playground Express. For Invention Bootcamp 2021, we use an external micro-OLED display, a SGP30 air quality sensor and a small DC fan.
Table of contents
I2C
I2C (Inter-Integrated Circuit) is a serial communication protocol that can simplify the connection between a microcontroller and external devices such as sensors and displays. You will also see I2C written IIC or \(\mathrm{I}^2\mathrm{C}\).
Some background on I2C and how to connect STEMMA/QT (Qwiic) connectors to the Circuit Playground Express are described on a separate page.
Micro-OLED display
Small Organic Light-Emitting Diode (OLED) displays are relatively inexpensive devices for text and graphical output from an Arduino board.
Read more about connecting a micro-OLED display to the Circuit Playground Express on a separate page.