I2C vs. SPI: Two Ways to Wire a Display

Chapter: 8 — Adding an OLED Display and Expressive Behaviors

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About This Poster

This chapter's OLED kit uses I2C, but SPI is the other protocol students will meet again outside this book — this poster gives a physical wiring reference for both.

How to Use

• Explore — click a protocol to see its wire count and how it's addressed.
• Quiz Me — test whether you can match a wiring fact to the right protocol.
• Edit mode — open main.html?edit=true to drag the zone corner handles and calibrate boundaries once the poster image is generated.

Zones

1. I2C Protocol — two shared wires, each device has an address
2. SPI Protocol — four wires per device, no addressing needed