How to: GPIO integration of old Alarm system contact sensors

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23

I agree, I already sent a question. We will see.

24

Iā€™ve integrated my brotherā€™s old home wiring into esphome with a MCP23017 IO extender. It gives you 16 contacts from which you can build binary sensors in Home Assistant with. Itā€™s pretty simple stuff.

25

@pashdown Iā€™m working on the same setup; any suggestions on how to manage a sensor like that one?

Essential the contact change the status and return to the original on extension of the cord (or in the other way round) , so the binary sensor change many time in a short timeframe

26

That looks interesting. Any chance you can provide a little documentation on the ESP you used, how you wired it and then the code youā€™re running?

27

It was a simple 8266. Not a lot of processing going on, so it works fine. Here is my esphome setup:

substitutions:
  device_name: "doors"
  friendly_name: "Doors"

esphome:
  name: ${device_name}

esp8266:
  board: d1_mini

wifi:
  networks:
    - ssid: !secret wifi_ssid
      password: !secret wifi_password

  # Optional manual IP
  manual_ip:
    static_ip: 192.168.0.7
    gateway: 192.168.0.1
    subnet: 255.255.255.0

  # use_address: 192.168.1.190
  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap: {}

# Enable logging
logger:

# Enable Home Assistant API
ota:
  password: !secret ota_password

api:
  encryption:
    key: "ENCRYPTIONKEYHERE="

captive_portal:

status_led:
  pin: GPIO2

i2c:
  sda: D6
  scl: D5
  scan: True

# Example configuration entry
mcp23017:
  - id: 'mcp23017_hub'
    address: 0x20

# Individual inputs
binary_sensor:
  - platform: gpio
    device_class: door
    name: "Guest Exit"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin B7
      number: 15
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
  - platform: gpio
    device_class: door
    name: "Lower Rear Middle Door"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin B6
      number: 14
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
  - platform: gpio
    device_class: door
    name: "Kitchen Door"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin B5
      number: 13
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
  - platform: gpio
    device_class: door
    name: "Bunker Exterior"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin B4
      number: 12
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
  - platform: gpio
    device_class: door
    name: "Bunker Interior"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin B3
      number: 11
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
  - platform: gpio
    device_class: door
    name: "Guest Interior"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin B2
      number: 10
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
  - platform: gpio
    device_class: door
    name: "Deck Door"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin B1
      number: 9
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
  - platform: gpio
    device_class: door
    name: "Garage Man Door"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin B8
      number: 8
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
  - platform: gpio
    device_class: door
    name: "Front Door"
    pin:
      mcp23xxx: mcp23017_hub
      # Use pin A1
      number: 1
      # One of INPUT or INPUT_PULLUP
      mode:
        input: true
        pullup: true
      inverted: false
28

Iā€™m guessing if it is two wire, one wire to the ground of the ESP and the other wire to a GPIO pin.

29

Thanks for adding the update.

30

yes, correct. any ideas regarding how to count the events?

31

With an automation that increments a counter?

32

This thread might provide you what youā€™re looking for.