experiments in AC dimming (DMX 4 Chan)
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##########################################################################################
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##########################################################################################
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# 4 Channel DMX Mains Dimmer
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# This is using an esp8366 (D1 Mini) sensing DMX512 Serial to a 2 channel
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# mains lighting contoller (1.2A/Channel)
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#
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# Contoller: https://www.aliexpress.com/item/32838426377.html
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# RS-485 TTL converter: https://www.aliexpress.com/item/1005005737922222.html
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#
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# V1.0 2025-09-06 First Rev (only tested one module, 2 channels at this stage, and incandescent)
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##########################################################################################
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#
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# NOTES
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# - Trialling with an incandescent bulb, 10% writes 26. Max value is 255 so this is 10%
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# - With an incandescent, I can't see any light output below about 15%
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# - Using GPIO2 as the UART TX on an ESP8266 is handy, as the onboard LED flashes with TX
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# - The dimmer needs to be set to DMX mode, and given an ID of 1-999 (not standalone or dynamic)
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# - there is no reason you can't run many dimmers off one ESP (limit may be in data speed lags?)
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# - The dimmer is pretty smooth, and it remembers values even if no data being transmitted.
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#
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# System Settings on Dimmer: (onboard buttons M and < held for 2 secs)
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# - Set "1 Channel" (d-1) and both channels will output the same levels. Or "2 Channel" (d-2)
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# - Set reverse phase dimming/trailing edge (C-R) or Forward/Leading Edge (C-F)
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# - Set minimum brightness on the dimmer, from b01-b40. Min is then 5% if b01
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# - Set the 3x 8 Segment display to automatically turn off (Bon/BoF) after a period
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# - pull both DE & RE high on the 485 converter to ensure data enabled (or wire to enable_pin)
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#
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# Other useful references
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# - Arduino DMX Controller https://www.youtube.com/watch?v=4PjBBBQB2m4
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# - ESP32 DMX Contoller with ESPixelstick (errors in his wiring diagram)
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# https://www.youtube.com/watch?v=GWZ63vsKzT8
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# - ESPHome DMX512 Custom component used here: https://github.com/andyboeh/esphome-dmx512
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# Includes good examples if you are expanding
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##########################################################################################
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##########################################################################################
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##########################################################################################
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# SPECIFIC DEVICE VARIABLE SUBSTITUTIONS
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# If NOT using a secrets file, just replace these with the passwords etc (in quotes)
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##########################################################################################
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substitutions:
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# Device Naming
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device_name: "esp-4chdmxdimmer1"
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friendly_name: "4 Channel DMX Dimmer 1"
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description_comment: "4 Channel Mains Lighting Dimmer using DMX512 protocol"
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device_area: "Lounge" # Allows ESP device to be automatically linked to an 'Area' in Home Assistant.
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# Project Naming
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project_name: "Generic ESP8266.D1 Mini" # Project Details
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project_version: "v1.0" # Project V denotes release of yaml file, allowing checking of deployed vs latest version
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# Passwords & Secrets
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api_key: !secret esp-api_key # unfortunately you can't use substitutions inside secrets names
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ota_pass: !secret esp-ota_pass # unfortunately you can't use substitutions inside secrets names
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static_ip_address: !secret esp-4chdmxdimmer1_ip
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# Device Settings
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#relay_icon: "mdi:lightbulb-group"
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log_level: "DEBUG" # Define logging level: NONE, ERROR, WARN, INFO, DEBUG (Default), VERBOSE, VERY_VERBOSE
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update_interval: "60s" # update time for for general sensors etc
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#########################################################################################
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# PACKAGES: Included Common Packages
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# https://esphome.io/components/packages.html
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##########################################################################################
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# Comment some of these out where not needed, eg MQTT, Web portal, SNTP, General Sensors
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##########################################################################################
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packages:
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common_wifi: !include
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file: common/network_common.yaml
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vars:
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local_device_name: "${device_name}"
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local_static_ip_address: "${static_ip_address}"
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local_ota_pass: "${ota_pass}"
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common_api: !include
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file: common/api_common.yaml
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vars:
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local_api_key: "${api_key}"
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#common_webportal: !include
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# file: common/webportal_common.yaml
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common_mqtt: !include
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file: common/mqtt_common.yaml
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vars:
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local_device_name: "${device_name}"
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common_sntp: !include
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file: common/sntp_common.yaml
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common_general_sensors: !include
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file: common/sensors_common.yaml
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vars:
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local_friendly_name: "${friendly_name}"
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local_update_interval: "${update_interval}"
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#########################################################################################
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# ESPHome
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# https://esphome.io/components/esphome.html
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#########################################################################################
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esphome:
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name: "${device_name}"
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friendly_name: "${friendly_name}"
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comment: "${description_comment}" # Appears on the esphome page in HA
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area: "${device_area}"
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project:
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name: "${project_name}"
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version: "${project_version}"
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#########################################################################################
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# ESP Platform and Framework
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# https://esphome.io/components/esp32.html
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#########################################################################################
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esp8266:
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board: esp01_1m
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#early_pin_init: False # Initialise pins early to known values. Recommended false where switches are involved. Defaults to True.
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board_flash_mode: dout # Default is dout
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restore_from_flash: true # restore some values on reboot
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mdns:
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disabled: false # Disabling will make the build file smaller (and it is still available via static IP)
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preferences:
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flash_write_interval: 0s
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#########################################################################################
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# ESPHome Logging Enable
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# https://esphome.io/components/logger.html
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#############################################
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logger:
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level: "${log_level}" #INFO Level suggested, or DEBUG for testing
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baud_rate: 0 #set to 0 for no logging via UART, needed if you are using it for other serial things (eg PZEM)
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#esp8266_store_log_strings_in_flash: false
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#tx_buffer_size: 64
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#########################################################################################
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# STATUS LED
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# https://esphome.io/components/status_led.html
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#########################################################################################
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#status_led:
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# pin:
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# number: GPIO2
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# inverted: yes
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#########################################################################################
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# UART COMPONENT
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# https://esphome.io/components/uart/
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#########################################################################################
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uart:
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# Needed for the DMX component.
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# This UART talks to the RS485 adaptor
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# There is no receiving, it is a one way send
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id: uart_bus
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baud_rate: 250000
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tx_pin:
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number: GPIO2 #ESP8266
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allow_other_uses: true # For ESPHome >= 2023.12.0
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stop_bits: 2
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##########################################################################################
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# LIGHT COMPONENT
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# https://esphome.io/components/light/
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##########################################################################################
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light:
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- platform: monochromatic
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name: "Test Lights Chan 1"
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output: dmx_1
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id: light_test_1
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default_transition_length: 5s
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gamma_correct: 1
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restore_mode: RESTORE_DEFAULT_ON
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- platform: monochromatic
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name: "Test Lights Chan 2"
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output: dmx_2
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id: light_test_2
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default_transition_length: 5s
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gamma_correct: 1
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restore_mode: RESTORE_DEFAULT_ON
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- platform: monochromatic
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name: "Test Lights Chan 3"
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output: dmx_3
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id: light_test_3
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default_transition_length: 5s
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gamma_correct: 1
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restore_mode: RESTORE_DEFAULT_ON
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- platform: monochromatic
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name: "Test Lights Chan 4"
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output: dmx_4
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id: light_test_4
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default_transition_length: 5s
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gamma_correct: 1
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restore_mode: RESTORE_DEFAULT_ON
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##########################################################################################
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# SENSOR COMPONENT
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# https://esphome.io/components/sensor/
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##########################################################################################
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##########################################################################################
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# CUSTOM COMPONENT DMX512
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# https://github.com/andyboeh/esphome-dmx512
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##########################################################################################
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external_components:
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- source: github://andyboeh/esphome-dmx512
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dmx512:
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id: dmx
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uart_id: uart_bus
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#enable_pin: GPIOXX (Optional, I've wire them to be always active)
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tx_pin:
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number: GPIO2
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allow_other_uses: true # For ESPHome >= 2023.12.0
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uart_num: 1
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##########################################################################################
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# OUTPUT COMPONENT
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# https://esphome.io/components/output/ledc.html
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##########################################################################################
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output:
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- platform: dmx512
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channel: 1 # The ID we set the device to
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universe: dmx # The ID of the DMX512 Component
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id: dmx_1
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- platform: dmx512
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channel: 2 # The ID we set the device to
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universe: dmx # The ID of the DMX512 Component
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id: dmx_2
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- platform: dmx512
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channel: 3 # The ID we set the device to
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universe: dmx # The ID of the DMX512 Component
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id: dmx_3
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- platform: dmx512
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channel: 4 # The ID we set the device to
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universe: dmx # The ID of the DMX512 Component
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id: dmx_4
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