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Miboxer TRI-C1WR Dimmer Module

Miboxer TRI-C1WR Dimmer Module

Device Type: dimmer
Electrical Standard: global
Difficulty: Chip needs replacement, 5/5

Miboxer TRI-C1WR Dimmer Module

PCB Top

PCB Bottom

General Notes

The Miboxer TRI-C1WR Dimmer Module uses the UART to communicate with Tuya MCU. This dimmer comes with a CB2S chip and requires replacement in order to be used with ESPHome. It is still possible to convert these switches to ESPHome by replacing the CB2S chip with an Espressif ESP8685-WROOM-03-H2/H4 or Wireless Tag WT32C3-01N or an esp8266 ESP-02 chip and this process will require heat gun, soldering tools and moderate soldering skill, for all chip replacements can be made easier with low melt solder as well, these were replaced with official espressif ESP8685-WROOM-03-H4 modules

Flashing

Flash using ESP Web install and select ESP32-C3 option.

To put ESP32-C3 in flash mode EN needs to be pulled high and GPIO9 need to be pulled low. May take a 2-3 attempts, but just disconnect and reconnect 3V3 while keeping GPIO9 pulled low and click the retry button again until it works.

The datasheet references GPIO8 which needs to be pulled low during flashing, best to solder a push switch or something that can act as a reset switch to allow ESP32-C3 to boot in flashing mode.

Test Board

ESP32 PinUSB Serial PinComments
3V33V3Connect to dedicated 3V3 1A power supply if encountering brown out
GGND
IO9GroundRound contact pad on back of board, pull low BEFORE attaching 3V3
IO83V3Could not find this pin, but it didn't seem to be required
TXRX
RXTX
EN3V3Pull high to enable ESP32 (do not leave floating)

Running

For normal operation connect EN to VCC (pull high) to enable the C3 chip. GPIO9 has an internal pullup and it needs to be high on power up for the module to boot so try and avoid that pin similar to GPIO0 on ESP8266.

ESP32's are power hungry on boot and the USB to serial adapter might not be able to provide enough power for that. Use a stable 3.3v power supply that can supply more than 1A.

GPIO Pinout for ESP32-C3

PinFunction
GPIO20RX
GPIO21TX

Getting it up and running

The Dimmer Module is a TuyaMCU device, however as the main CB2S chip needs to be replaced with a Espressif ESP8685-WROOM-03-H2/H4 or Wireless Tag WT32C3-01N or an esp8266 ESP-02 chip, which is easily flashed before soldering. After that, you can use ESPHome's OTA functionality to make any further changes.

Configuration for ESP-IDF

substitutions:
  device_ssid: "Tuya Dimmer"
  device_name: tuyadimmer
  device_description: "Miboxer TRI-C1WR Dimmer Module ESP32-C3 ESP-IDF"
  friendly_name: "Miboxer TRI-C1WR Dimmer Module"
  main_device_id: "tuyadimmer" # Put the name that you want to see in Home Assistant.
  light_icon: "mdi:lightbulb-spot"
  project_name: "miboxer.tri-c1wr-esp-idf"
  project_version: "1.0"


esphome:
  name: ${device_name}
  comment: ${device_description}
  platformio_options:
    board_build.flash_mode: dio
  project:
    name: "${project_name}"
    version: "${project_version}"


esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: esp-idf
  
# OTA flashing
ota:
  - platform: esphome


wifi: # Your Wifi network details
  
# Enable fallback hotspot in case wifi connection fails  
  ap:


# Enabling the logging component
logger:


# Enable Home Assistant API
api:


# Enable the captive portal
captive_portal:


uart:
  rx_pin: GPIO20
  tx_pin: GPIO21
  baud_rate: 9600


# Register the Tuya MCU connection
tuya:


sensor:
  # WiFi Signal sensor.
  - platform: wifi_signal
    name: ${friendly_name} Signal strength
    update_interval: 60s
    internal: true
  # Uptime Sensor
  - platform: uptime
    name: "${friendly_name} Uptime"
    id: uptime_sensor
    update_interval: 360s
    on_raw_value:
      then:
        - text_sensor.template.publish:
            id: uptime_human
            state: !lambda |-
              int seconds = round(id(uptime_sensor).raw_state);
              int days = seconds / (24 * 3600);
              seconds = seconds % (24 * 3600);
              int hours = seconds / 3600;
              seconds = seconds % 3600;
              int minutes = seconds /  60;
              seconds = seconds % 60;
              return (
                (days ? to_string(days) + "d " : "") +
                (hours ? to_string(hours) + "h " : "") +
                (minutes ? to_string(minutes) + "m " : "") +
                (to_string(seconds) + "s")
              ).c_str();


# Restart Buttons
button:
  - platform: restart
    id: "restart_device"
    name: "${friendly_name} Restart"
    entity_category: "diagnostic"
  - platform: safe_mode
    id: "restart_device_safe_mode"
    name: "${friendly_name} Restart (Safe Mode)"
    entity_category: "diagnostic"


# Dimmer Function
light:
  - platform: "tuya"
    name: "${friendly_name}"
    id: ${main_device_id}
    dimmer_datapoint: 22
    switch_datapoint: 20
    min_value: 10
    max_value: 1000
    icon: "${light_icon}"


# Disable Dimming Function
switch:
  - platform: "tuya"
    id: "${main_device_id}_mode"
    name: "${friendly_name} Switch Only Mode"
    switch_datapoint: 102


# Minimum Brightness
number:
  - platform: "tuya"
    name: "${friendly_name} Minimum Brightness"
    number_datapoint: 103
    min_value: 0
    max_value: 255
    step: 1
substitutions:
  device_ssid: "Tuya Dimmer"
  device_name: tuyadimmer
  device_description: "Miboxer TRI-C1WR Dimmer Module ESP32-C3 ESP-IDF"
  friendly_name: "Miboxer TRI-C1WR Dimmer Module"
  main_device_id: "tuyadimmer" # Put the name that you want to see in Home Assistant.
  light_icon: "mdi:lightbulb-spot"
  project_name: "miboxer.tri-c1wr-arduino"
  project_version: "1.0"


esphome:
  name: ${device_name}
  comment: ${device_description}
  project:
    name: "${project_name}"
    version: "${project_version}"
  platformio_options:
    board_build.flash_mode: dio


esp32:
  board: esp32-c3-devkitm-1
  framework:
    type: arduino
    version: 2.0.5
    platform_version: 5.2.0
  
# OTA flashing
ota:
  - platform: esphome


wifi: # Your Wifi network details
  
# Enable fallback hotspot in case wifi connection fails  
  ap:


# Enabling the logging component
logger:


# Enable Home Assistant API
api:


# Enable the captive portal
captive_portal:


# Enable the Web Server component 
webserver:


uart:
  rx_pin: GPIO20
  tx_pin: GPIO21
  baud_rate: 9600


# Register the Tuya MCU connection
tuya:


sensor:


  # Uptime Sensor
  - platform: uptime
    name: "${friendly_name} Uptime"
    id: uptime_sensor
    update_interval: 360s
    on_raw_value:
      then:
        - text_sensor.template.publish:
            id: uptime_human
            state: !lambda |-
              int seconds = round(id(uptime_sensor).raw_state);
              int days = seconds / (24 * 3600);
              seconds = seconds % (24 * 3600);
              int hours = seconds / 3600;
              seconds = seconds % 3600;
              int minutes = seconds /  60;
              seconds = seconds % 60;
              return (
                (days ? to_string(days) + "d " : "") +
                (hours ? to_string(hours) + "h " : "") +
                (minutes ? to_string(minutes) + "m " : "") +
                (to_string(seconds) + "s")
              ).c_str();
    # ESP32 Temperature
  - platform: template
    name: ${friendly_name} ESP32 Internal Temperature
    id: temp
    lambda: return temperatureRead();
    unit_of_measurement: °C
    accuracy_decimals: 2


# Restart Buttons
button:
  - platform: restart
    id: "restart_device"
    name: "${friendly_name} Restart"
    entity_category: "diagnostic"
  - platform: safe_mode
    id: "restart_device_safe_mode"
    name: "${friendly_name} Restart (Safe Mode)"
    entity_category: "diagnostic"


# Dimmer Function
light:
  - platform: "tuya"
    name: "${friendly_name}"
    id: ${main_device_id}
    dimmer_datapoint: 22
    switch_datapoint: 20
    min_value: 10
    max_value: 1000
    icon: "${light_icon}"


# Disable Dimming Function
switch:
  - platform: "tuya"
    id: "${main_device_id}_mode"
    name: "${friendly_name} Switch Only Mode"
    switch_datapoint: 102


# Minimum Brightness
number:
  - platform: "tuya"
    name: "${friendly_name} Minimum Brightness"
    number_datapoint: 103
    min_value: 0
    max_value: 255
    step: 1
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