Fritzing

This guide shows you how to use PCF8574 with Raspberry PI. The PCF8574 is a 8 bits I/O port expander that uses the I2C bus. To the PCF8574 I will connect the relay module, this will allow control of the electrical device from the Raspberry PI. I will also show an example how to write a program to handle PCF8574 in C++ on Linux.

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This guide shows you how to use PCF8574 with Raspberry PI. The PCF8574 is a 8 bits I/O port expander that uses the I2C bus. To the PCF8574 I will connect the relay module, this will allow control of the electrical device from the Raspberry PI. I will also show an example how to write a program to handle PCF8574 in C++ on Linux.

 

Step 1: Components

Components I used in this example.

• Raspberry PI
• PCF8574
• Relay Module 250V 10A
• Some wires

 

See more:

Control any devices using Raspberry PI and PCF8574, relay module