ESPHome template for the Milfra MFA05 Motion-sensing wall switch.

milfra-mfa05.base.yaml

#---
#substitutions:
#  https://esphome.io/guides/configuration-types.html#substitutions
#  device_name: garage-overhead # hostname & entity_id
#  motion_on_time: '15s' # time to leave the relay on after motion is sensed 
#  motion_off_holdoff: '2s'  # how long to ignore motion if turned off a short press of the button
#  button_hold_for_hold_on_time: '2s'  # how long to press and hold the button to switch to hold-on mode



# This is for the Milfra MFA05 single-button PIR-motion relay switch

# This config implements local control of the relay using the button or detected motion

# We have two main modes: motion-sensing mode, and hold-on mode

# In motion-sensing mode:
# If there is motion, the relay is turned on
# When the motion stops, the relay waits motion_on_time before turning the lights off
# A button press also turns off the relay
# Once the relay is off, we ignore motion events for a hold-off period, so we don't re-trigger to quickly
# If the button is held down, you switch to hold-on mode

# In hold-on mode:
# The light stays on indefinately
# Pressing the button turns the relay off (and takes us back to motion-sensing mode)

# The green LED is used to indicate the relay output state
# The blue LED is used to indicate that we're in the most-motion hold-off mode
# The blue LED is also used for indicating device status (wifi)


## example config (for using this template

#substitutions:
  ## https://esphome.io/guides/configuration-types.html#substitutions
  #device_name: pantry # hostname & entity_id
  #motion_on_time: '120' # time (in seconds) to leave the relay on after motion is sensed 
  #motion_off_holdoff: '5'  # how long (in seconds) to ignore motion if turned off via button or motion ending
  #button_hold_for_hold_on_time: '1s'  # how long to press and hold the button to switch to hold-on mode

#<<: !include milfra-mfa05.base.yaml

## end example config



esphome:
  name: ${device_name}
  platform: ESP8266
  board: esp8285

wifi:
  # https://esphome.io/components/wifi
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  
logger:
  # https://esphome.io/components/logger
  level: INFO
  #level: VERBOSE

ota:

web_server:

captive_portal:

api:
  #password: !secret esphome_api_password
  # https://esphome.io/components/api
  #reboot_timeout: 0s #disable auto-reboot if homeassistant is not connecting
 
light: 
  - platform: status_led
    id: led2
    pin:
      # Blue LED
      number: GPIO13
      inverted: true

# The green LED appears to mask the blue 
# It also appears to be overridden by the relay
output:
- platform: gpio
  # Green LED
  id: led1
  pin: GPIO16
        
switch:
- platform: gpio
  name: "${device_name}_Relay"
  id: relay
  restore_mode: ALWAYS_OFF
  pin: GPIO12
  on_turn_on:
    - output.turn_off: led1
  on_turn_off:
    - output.turn_off: led1
    

binary_sensor:
  - platform: gpio
    id: button
    pin:
      number: GPIO0
      mode: INPUT_PULLUP
      inverted: true
    on_click:
      - script.execute: press_action
    on_multi_click:
      - timing:
        - ON for at least ${button_hold_for_hold_on_time}
        then:
          - script.execute: hold_on_action

      
  - platform: gpio
    name: ${device_name}_Motion_Sense
    device_class: "motion"
    pin:
      number: GPIO5
      inverted: true
      mode: INPUT_PULLUP
    on_press:
      then:
        - logger.log:
            format: "state %d, motion high"
            args: [ 'id(motion_state)' ]
        -  if: 
            condition:
              lambda: |-
                return ( id(motion_state) == 0 || id(motion_state) == 1);
            then:
              - script.stop: motion_stopped
              - script.stop: motion_holdoff
              - light.turn_off: led2
              - globals.set:
                  id: motion_state
                  value: "1"
              - switch.turn_on: relay
          
    on_release:
      #- output.turn_off: led1
      then:
        - logger.log:
            format: "state %d, motion low"
            args: [ 'id(motion_state)' ]
        - if:
            condition:
              lambda: |-
                return ( id(motion_state) == 1 || id(motion_state) == 4 ) ;
            then:
              - script.stop: motion_holdoff
              - script.execute: motion_stopped
              - light.turn_off: led2

  - platform: gpio
    name: ${device_name}_Light_Sense
    device_class: "light"
    pin:
      number: GPIO14
      mode: INPUT
      
globals:
   - id: motion_state
     type: int
     restore_value: no
     initial_value: '0'
     # 0 = off
     # 1 = on by motion
     # 2 = off after motion, in hold-off
     # 3 = hold-on state
     # 4 = quick on via button when no motion
   - id: motion_keep_on_seconds_remaining
     type: int
     restore_value: no
     initial_value: '0'
   - id: motion_hold_off_seconds
     type: int
     restore_value: no
     initial_value: '0'
      
      
script:
  # immediately stops the timer and turns everything off
  # only runs if we're turned on by motion or a quick press
  - id: motion_stopped
    mode: restart
    then:         
          - light.turn_off: led2 # the hold-on light
          - globals.set:
              id: motion_state
              value: "1"
          - globals.set:
              id: motion_keep_on_seconds_remaining
              value: ${motion_on_time}
          - while: 
              condition:
                lambda: |-
                  return(id(motion_keep_on_seconds_remaining) > 0);
              then:
                - logger.log:
                    format: "off after motion, seconds_remaining %d"
                    args: [ 'id(motion_keep_on_seconds_remaining)' ]
                - lambda: |-
                    id(motion_keep_on_seconds_remaining) -= 1;
                - delay: 1s
          - switch.turn_off: relay
          #now the relay is off, but we need to do a hold-off delay, in case turning off the lights re-triggers us
          - script.execute: motion_holdoff
  - id: motion_holdoff
    mode: restart
    then:         
          - light.turn_on: led2 # the hold-on light
          - globals.set:
              id: motion_hold_off_seconds
              value: ${motion_off_holdoff}
          - globals.set:
              id: motion_state
              value: "2"
          - while: 
              condition:
                lambda: |-
                  return(id(motion_hold_off_seconds) > 0);
              then:
                - logger.log:
                    format: "hold off, seconds_remaining %d"
                    args: [ 'id(motion_hold_off_seconds)' ]
                - lambda: |-
                    id(motion_hold_off_seconds) -= 1;
                - delay: 1s
          - light.turn_off: led2
          - globals.set:
              id: motion_state
              value: "0"
          
  - id: press_action
    then:
      - logger.log:
          format: "press action"
      - if:
          condition:
            lambda: |-  # on by motion or buttons
              return ( id(motion_state) == 1  ||  id(motion_state) == 3  || id(motion_state) == 4);   
          then:
            - logger.log:
                format: "state %d, force off"
                args: [ 'id(motion_state)' ]
            - script.stop: motion_stopped
            - light.turn_off: led2
            - script.execute: motion_holdoff # we start the holdoff so we ignore motion events for a moment
            - switch.turn_off: relay
          else: 
            - logger.log:
                format: "state %d -> 4, short on"
                args: [ 'id(motion_state)' ]
            - script.stop: motion_holdoff
            - script.stop: motion_stopped
            - light.turn_off: led2
            - switch.turn_on: relay
            - globals.set:
                id: motion_state
                value: "4"
          
  - id: hold_on_action
    then:
      - logger.log:
          format: "hold_on_action"
      - if:
          condition:
            lambda: |-  # on by motion or buttons
              return ( id(motion_state) == 1  ||  id(motion_state) == 3  || id(motion_state) == 4);   
          then:
            - logger.log:
                format: "state %d, long force off"
                args: [ 'id(motion_state)' ]
            - script.stop: motion_stopped
            - script.execute: motion_holdoff # we start the holdoff so we ignore motion events for a moment
            - switch.turn_off: relay
          else: 
            - script.stop: motion_stopped
            - script.stop: motion_holdoff
            - light.turn_off: led2
            - switch.turn_on: relay
            #- output.turn_off: led1

            - logger.log:
                format: "state %d -> 3, hold on"
                args: [ 'id(motion_state)' ]
            - globals.set:
                id: motion_state
                value: "3"
              
           

I have ordered a couple of these from Hidin Tech on Alibaba.... The claim to be ESP based so will let you know how I get on when they arrive :-)
https://www.amazon.com/Smart-Motion-Sensor-Switch-Occupancy/dp/B0BBVFG7GD

Would you consider creating an alternate version that when we press+hold the button the switch turns to full manual... Simply turning off/on with the button untill someone uses press+hold again to change the mode?
In both cases always reporting the motion sensor to Home Assistant would be good to have regardless of the mode.

I can try, but it may take me a bit to get around to it. I actually only have one of these installed, and it's in a pantry where it's not used for anything sophisticated.

Give it a go yourself if you want. I know the implementation is a mess to read, but the core of it is that we're tracking what state we're in motion_state, and using that to decide what to do when something happens. Right now, there's a state 3, which I called "hold-on state", that basically means "the user held the button to lock the light on". The logic for a single press ("press_action") treats that just like any other on state, so another press turns it back off and into regular mode. I think you just want to add a another state for "manual mode, but off" and handle transitions into and out of it correctly.

The ones I bought from aliexpress were labeled as wanted MFA05 but I got wanted MFA05F