CH422G I/O Expander¶
The CH422G component allows you to use the CH422G I/O expander in ESPHome. It uses an I²C Bus for communication. The I²C address is not configurable as the CH422G has a separate address for each internal register.
Once configured, you can use any of the 12 available GPIO pins in many places a GPIO pin is required. Within ESPHome they can be used in place of internal GPIO pins in many of ESPHome’s components such as the GPIO Binary Sensor or GPIO Switch. They are not usable for PWM or other situations requiring an internal GPIO pin.
Pins 0-7 correspond to the bidirectional I/O (segment) pins on the CH422G. Pins 8-11 correspond to the OC (digit) output pins 0-3.
Note
This I/O Expander chip is used in several Waveshare ESP32-S3 display boards.
# Example configuration entry
ch422g:
- id: ch422g_hub
# Individual outputs
switch:
- platform: gpio
name: CH422G Pin 0
pin:
ch422g: ch422g_hub
number: 0
mode:
output: true
inverted: false
Configuration variables:¶
id (Required, ID): The id to use for this
ch422g
component.
Pin configuration variables:¶
ch422g (Required, ID): The id of the
ch422g
component of the pin.number (Required, int): The pin number. Valid numbers are 0-11.
inverted (Optional, boolean): If the pin state should be inverted. Defaults to
false
.mode (Optional, string): A pin mode to set the pin at. One of
INPUT
orOUTPUT
, orOUTPUT_OPEN_DRAIN
.
Open drain mode is supported only on pins 8-11. Input is supported only on pins 0-7.