PCF8574 I/O Expander¶
Once configured, you can use any of the 8 pins (PCF8574) or 16 pins (PCF8575) as pins for your projects. Within ESPHome they emulate a real internal GPIO pin and can therefore be used with many of ESPHome’s components such as the GPIO binary sensor or GPIO switch.
Any option accepting a Pin Schema can theoretically be used, but some more complicated components that do communication through this I/O expander will not work.
# Example configuration entry pcf8574: - id: 'pcf8574_hub' address: 0x21 pcf8575: False # Individual outputs switch: - platform: gpio name: "PCF8574 Pin #0" pin: pcf8574: pcf8574_hub # Use pin number 0 number: 0 # One of INPUT or OUTPUT mode: OUTPUT inverted: False
id (Required, ID): The id to use for this PCF8574 component.
address (Optional, int): The I²C address of the driver. Defaults to
pcf8575 (Optional, boolean): Whether this is a 16-pin PCF8575. Defaults to
Pin configuration variables:¶
pcf8574 (Required, ID): The id of the PCF8574 component of the pin.
number (Required, integer): The pin number.
inverted (Optional, boolean): If all read and written values should be treated as inverted. Defaults to
mode (Optional, string): A pin mode to set for the pin at. One of