MCP23017 I2C Port Expander

You can easily add more GPIO connections for an ESP8266 using a port expander. This example demonstrates how to do that with a common I2C port expander.

If you need a faster connection, see MCP23S17 SPI Port Expander.

References

• Source Code

• Sming (main)

• MCP23017 I2C Port Expander

SoC support

• esp32

• esp32c2

• esp32c3

• esp32s2

• esp32s3

• esp8266

• host

• rp2040