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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

  1. I2C
  2. Micro-OLED display

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.