PCF8574 IO Expansion Board I/O Expander I2C-Bus Evaluation Development Module
Do you have too few IO pins, but do you have an I2C bus at your disposal? Then you can use this module to create more (standard) pins.
De PCF8574 works on both 3.3V and 5V. (output equal to input voltage)
Specifications:
- Voltage: 2.5 – 6V DC
- Jumpers present to set I2C address
- 8 extra pins per module
- Pin can be used as input and output
- Pull-up resistors for I2C bus already present
- Possible to link multiple modules together for more pins (up to 8 modules*)
- Chip:  PCF8574(T) or PCF8574A(T)
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