PCA9635

The pca9635 component allows you to use the PCA9635 16-channel 8-bit I²C LED driver in ESPHome. It uses the I²C Bus for communication.

This chip is very similar to the popular PCA9685, but it offers 8-bit resolution (0-255 steps) rather than 12-bit.

To use the channels of this component, you first need to setup the global pca9635 hub and give it an id, and then define the individual output channels.

Component/Hub

# Example configuration entry
pca9635:
  id: pca9635_hub
  address: 0x15

Configuration variables:

• address (Optional, int): The I²C address of the driver. Defaults to 0x15. Depending on your hardware strapping (A0-A6 pins), this may vary. Common addresses include 0x15 or 0x70 (All-Call).

• id (Optional, ID): The id to use for this pca9635 component. Use this if you have multiple PCA9635s connected at the same time.

• i2c_id (Optional, ID): The id of the I²C bus to use.

PCA9635 Output

The pca9635 output platform allows you to use a single channel of the driver as a Float Output.

Individual outputs

output:
  - platform: pca9635
    pca9635_id: pca9635_hub
    channel: 0
    id: led_output_1

Configuration variables:

channel (Required, int): Choose the channel of the PCA9635 for this output. Must be in range from 0 to 15.

pca9635_id (Optional, ID): Manually specify the ID of the PCA9635 hub. Use this if you have multiple PCA9635s you want to use at the same time. id (Required, ID): The id to use for this output component.

All other options from Output (e.g., inverted, min_power, max_power).

Examples

Using as a Dimmable Light

The most common use case is connecting LEDs to the PCA9635 and controlling them as a light in Home Assistant.

i2c:
  sda: GPIO21
  scl: GPIO22

pca9635:
  id: my_driver
  address: 0x15

output:
  # Define the output for Channel 0
  - platform: pca9635
    id: output_channel_0
    channel: 0
    pca9635_id: my_driver

light:
  # Link the output to a Light entity
  - platform: monochromatic
    name: "Kitchen Light"
    output: output_channel_0
    default_transition_length: 0.5s

Using as an RGB Light

You can combine three channels to create a full RGB light.

output:
  - platform: pca9635
    id: r_out
    channel: 0
  - platform: pca9635
    id: g_out
    channel: 1
  - platform: pca9635
    id: b_out
    channel: 2

light:
  - platform: rgb
    name: "Living Room Strip"
    red: r_out
    green: g_out
    blue: b_out