Amazon.com: AITRIP 10pcs PCF8574 IO Expansion Board I/O Expander I2C-Bus Evaluation Development Module for Arduino & Raspberry Pi : Industrial & Scientific
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5pcs PCF8574 PCF8574T I/O for I2C Port Interface Support Cascading Extended Module|interface i2c|interface modulec c - AliExpress
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I2C Port Expander Board (Arduino code included!) from Celtic Engineering Solutions on Tindie
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![Nettigo: PCF8574 Module - 8-bit I/O Expander for I2C Bus [Yā nǔ shén]](https://nettigo.eu/system/images/2080/original.jpg?1488806860 "Nettigo: PCF8574 Module - 8-bit I/O Expander for I2C Bus [Yā nǔ shén]")
Nettigo: PCF8574 Module - 8-bit I/O Expander for I2C Bus [Yā nǔ shén]
