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MAX6956 I/O Expander
====================
.. seo::
:description: Instructions for setting up MAX6956 port expanders in ESPHome.
:image: max6956.jpg
:keywords: MAX6956
The MAX6956 component allows you to use MAX6956 I/O expanders
(`datasheet <https://datasheets.maximintegrated.com/en/ds/MAX6956.pdf>`__) in ESPHome. It uses :ref:`I²C Bus <i2c>` for communication.
The ``max6956`` exists in 2 versions 20 or 28 ports, depending on the packaging.
Once configured, you can use any of the 20 or 28 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. Interrupt-on-change for inputs is not possible.
Pins can also be individualy configured as led driver and used with Light components. Current value can be set globaly or for each pin, through 16 possible levels. Driving RGB
led requires 3 pins.
Any option accepting a :ref:`Pin Schema <config-pin_schema>` can theoretically be used.
Component/Hub
-------------
.. figure:: images/max6956.jpg
:align: center
:width: 80.0%
MAX6956 I/O Expander.
The ``max6956`` is an :ref:`I²C Bus <i2c>` slave. Its address is configured using A0 and A1 hardware pins from 0x40 to 0x4F.
.. code-block:: yaml
max6956:
- id: max6956_1
address: 0x40
i2c_id: bus_a
Configuration variables:
************************
- **id** (**Required**, :ref:`config-id`): The id to use for this ``max6956`` component.
- **address** (*Optional*, int): The I²C address of the driver.
Defaults to ``0x40``.
- **i2c_id** (*Optional*): The I²C Bus ID
Defaults to ``false``
- **brightness_global** (*Optional*): Set the value of the current to be sink by all pins configured as led driver.
Defaults to ``0``
- **brightness_mode** (*Optional*): Define if the current to be sink will be confgured globaly or per pin configured as led driver.
Defaults to ``global``
Binary Sensor Example
---------------------
``max6956`` pins can be use as binary sensor. Individual pullup are supported.
.. code-block:: yaml
# Example configuration : pin as input with pullup
i2c:
id: bus_a
sda: GPIO13
scl: GPIO16
scan: false
max6956:
- id: max6956_1
address: 0x40
i2c_id: bus_a
# Individual input
binary_sensor:
- platform: gpio
name: "MaxIn Pin 4"
id: In_4
pin:
max6956: max6956_1
number: 4
mode:
input: true
pullup: true
inverted: False
Switch Example
--------------
``max6956`` pins can be use as switch.
.. code-block:: yaml
# Example configuration : pin as output
i2c:
id: bus_a
sda: GPIO13
scl: GPIO16
max6956:
- id: max6956_1
address: 0x40
i2c_id: bus_a
# Individual output
switch:
- platform: gpio
name: "MaxIn Pin 8"
id: In_8
pin:
max6956: max6956_1
number: 8
mode:
output: true
inverted: False
Led driver Example
------------------
``max6956`` can control a constant-current sink to drive leds, with 16 equal steps from 1.5mA to 24mA.
.. code-block:: yaml
# Example configuration : pin as led driver, current globaly
i2c:
id: bus_a
sda: GPIO13
scl: GPIO16
switch:
- platform: template
name: "Led"
id: MaxOut4
optimistic: true
turn_on_action:
- output.turn_on: maxOut_pin4
turn_off_action:
- output.turn_off: maxOut_pin4
number:
- platform: template
name: "Global brightness"
id: global_brightness
optimistic: true
min_value: 0
max_value: 15
initial_value: 1
step: 1
mode: slider
on_value:
- max6956.set_brightness_global:
id: max6956_1
brightness_global: !lambda return x;
max6956:
- id: max6956_1
address: 0x40
i2c_id: bus_a
brightness_mode: global
brightness_global: 5
#output to use
output:
- platform: max6956
pin: 4
id: maxOut_pin4
#led binded to output
light:
- platform: monochromatic
id: Light_1
output: maxOut_pin4
.. code-block:: yaml
# Example configuration : pin as led driver, current managed individualy (RBG led)
i2c:
id: bus_a
sda: GPIO13
scl: GPIO16
max6956:
- id: max6956_1
address: 0x40
i2c_id: bus_a
brightness_mode: segment
switch:
- platform: template
name: "Led Red"
id: MaxOut4
optimistic: true
turn_on_action:
- output.turn_on: maxOut_pin4
turn_off_action:
- output.turn_off: maxOut_pin4
- platform: template
name: "Led Green"
id: MaxOut5
optimistic: true
turn_on_action:
- output.turn_on: maxOut_pin5
turn_off_action:
- output.turn_off: maxOut_pin5
- platform: template
name: "Led Blue"
id: MaxOut6
optimistic: true
turn_on_action:
- output.turn_on: maxOut_pin6
turn_off_action:
- output.turn_off: maxOut_pin6
number:
- platform: template
name: "Number Red"
id: number_LedRed
optimistic: true
min_value: 0
max_value: 100
initial_value: 10
step: 1
mode: slider
on_value:
- output.set_level:
id: maxOut_pin4
level: !lambda return x/100;
- platform: template
name: "Number Green"
id: number_LedGreen
optimistic: true
min_value: 0
max_value: 100
initial_value: 10
step: 1
mode: slider
on_value:
- output.set_level:
id: maxOut_pin5
level: !lambda return x/100;
- platform: template
name: "Number Blue"
id: number_LedBlue
optimistic: true
min_value: 0
max_value: 100
initial_value: 10
step: 1
mode: slider
on_value:
- output.set_level:
id: maxOut_pin6
level: !lambda return x/100;
output:
- platform: max6956
pin: 4
id: maxOut_pin4
- platform: max6956
pin: 5
id: maxOut_pin5
- platform: max6956
pin: 6
id: maxOut_pin6
light:
- platform: rgb
id: Light_1
default_transition_length: 0.1s
gamma_correct: 1
red: maxOut_pin4
green: maxOut_pin5
blue: maxOut_pin6
See Also
--------
- :ref:`i2c`
- :doc:`switch/gpio`
- :doc:`/components/binary_sensor/index`
- :doc:`binary_sensor/gpio`
- :doc:`light/binary`
- :doc:`light/rgb`
- :apiref:`max6956/max6956.h`
- :ghedit:`Edit`
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