Please Include i2C PCF8575 expansion modules

[Russ5612]

The GPIO Viewer is an excellent enhancement idea, thank you very much.

Please add the I2C PCF8575 I/O Expansion Modules, I have numerous projects that use multiple IO's and use up to 6 modules connected to a single ESP32

Many thanks
Russ

[thelastoutpostworkshop]

Thank you, so Pxx refers to GPIO xx (ex.: P12 is GPIO 12), is that right ?

[Russ5612]

You are correct.
These boards expand the GPIO of an ESP32 using the I2C bus.
See this PDF for more details https://www.ti.com/lit/ds/symlink/pcf8575.pdf

pcf8575 (1).pdf

So to summarize, the GPIO for each PCF8575 board is the same, the ESP32 works on the various board ID's to identify the specific GPIO

Some of my code:

1. Each board is given an id, below is YAML code which I use in ESPHome:
   pcf8574:
   • id: 'pcf8575_0' # Board 0
     address: 0x20
     i2c_id: bus_b
     pcf8575: True
   • id: 'pcf8575_1' # Board 1
     address: 0x21
     i2c_id: bus_b
     pcf8575: True
   • id: 'pcf8575_2' # Board 2
     address: 0x22
     i2c_id: bus_b
     pcf8575: True
   • id: 'pcf8575_3' # Board 3
     address: 0x23
     i2c_id: bus_b
     pcf8575: True
     I use them as extra inputs or outputs. Below is an abbreviated YAML code which I use in ESPHome, note "#" is for comments as "//" in Arduino IDE:
     binary_sensor:

• platform: gpio
  #restore_mode: RESTORE_INVERTED_DEFAULT_OFF
  name: "PCF8575 Pin Could you please add ESP8266 WeMos d1 mini? #20-00 - Motion Sensor A"
  pin:
  pcf8574: pcf8575_0 # Board 0

  Use pin number 00

  number: 00

  One of INPUT or OUTPUT

  mode: INPUT
  inverted: true

• platform: gpio
  name: "PCF8575 Pin Could you please add ESP8266 WeMos d1 mini? #20-01 - Motion Sensor B"
  pin:
  pcf8574: pcf8575_0 # Board 0

  Use pin number 01

  number: 01

  One of INPUT or OUTPUT

  mode: INPUT
  inverted: true

• platform: gpio
  name: "PCF8575 Pin LILYGO® TTGO T7 Mini32 V1.5 #21-00 - Switch Study 1=on/0=off"
  pin:
  pcf8574: pcf8575_1 # Board 1
  # Use pin number 00
  number: 00
  # One of INPUT or OUTPUT
  mode: INPUT
  inverted: true

  • platform: gpio
    name: "PCF8575 Pin LILYGO® TTGO T7 Mini32 V1.5 #21-01 - Sonoff Lounge 1=on/0=off"
    pin:
    pcf8574: pcf8575_1 # Board 1

    Use pin number 01

    number: 01

    One of INPUT or OUTPUT

    mode: INPUT
    inverted: true

  • platform: gpio
    name: "PCF8575 Pin Please add NodeMCU-ESP32 DEVKITV1 #22-00 - Lamp D 1=on/0=off"
    pin:
    pcf8574: pcf8575_2 # Board 2

    Use pin number 00

    number: 00

    One of INPUT or OUTPUT

    mode: INPUT
    inverted: true

  • platform: gpio
    name: "PCF8575 Pin Please add NodeMCU-ESP32 DEVKITV1 #22-01 - Lamp E 1=on/0=off"
    pin:
    pcf8574: pcf8575_2 # Board 2

    Use pin number 01

    number: 01

    One of INPUT or OUTPUT

    mode: INPUT
    inverted: true

switch:

• platform: gpio
  name: "PCF8575 Pin Could you please add ESP8266 WeMos d1 mini? #20-08 - Entrance Light"
  pin:
  pcf8574: pcf8575_0 # Board 0

  Use pin number 08

  number: 08

  One of INPUT or OUTPUT

  mode: OUTPUT
  inverted: true

• platform: gpio
  name: "PCF8575 Pin Please add NodeMCU-ESP32 DEVKITV1 #22-08 - Power to Alarm"
  pin:
  pcf8574: pcf8575_3 # Board 3

  Use pin number 08

  number: 08

  One of INPUT or OUTPUT

  mode: OUTPUT
  inverted: true

[Russ5612]

Sorry the positing did some strange font adjustments