door – Nick Momrik

In our basement we have a baby gate, which surprisingly keeps our cat out of the gym and golf sim areas.

Sometimes we forget to close the gate, so I needed a sensor to monitor its state. I still had the breadboard from the air quality monitor project, so it was quick to add a magnetic door switch and test things out with the D1 Mini clone.

I have extra sensors, so those were kept in the project and allowed me to get rid of the shitty DHT22 I added to the golf remote. Everything worked, but I want to save my last two D1 minis and use them for something with the screens I have for them. So I swapped in an Adafruit Feather HUZZAH ESP8266, which I got with AdaBox 3 or 4 in 2017 and made minor changes to the code.

Parts:

References:

ESPHome YAML code:

substitutions:
  slug: gate
  friendly: Gate

esphome:
  name: ${slug}
  friendly_name: ${friendly}

esp8266:
  board: huzzah

logger:
  level: WARN

api:
  encryption:
    key: 'xxx'

ota:
  - platform: esphome
    password: "xxx"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  manual_ip:
    static_ip: x.x.x.x
    gateway: x.x.x.x
    subnet: 255.255.255.0

i2c:

binary_sensor:
  - platform: gpio
    pin:
      number: GPIO14
      mode:
        input: true
        pullup: true
    name: ${friendly}
    device_class: door

sensor:
  - platform: htu21d
    model: SI7021
    temperature:
      name: Temperature
      id: ${slug}_temp
    humidity:
      name: Humidity
      id: ${slug}_humid

  - platform: aht10
    variant: AHT20
    temperature:
      name: AHT21 Temperature
      id: ${slug}_aht21_temp
    humidity:
      name: AHT21 Humidity
      id: ${slug}_aht21_humid

  - platform: ens160_i2c
    address: 0x53
    eco2:
      name: CO²
    tvoc:
      name: VOC
    aqi:
      id: demo_aqi
      name: AQI
    compensation:
      temperature: ${slug}_aht21_temp
      humidity: ${slug}_aht21_humid

text_sensor:
  - platform: template
    name: AQI Rating
    lambda: |-
      switch ( (int) ( id( ${slug}_aqi ).state ) ) {
        case 1: return {"Excellent"};
        case 2: return {"Good"};
        case 3: return {"Moderate"};
        case 4: return {"Poor"};
        case 5: return {"Unhealthy"};
        default: return {"N/A"};
      }

I also added this to my configuration.yaml because I wanted a gate icon instead of the door, due to the device class of the binary sensor:

template:
 - binary_sensor:
    - name: Gate
      unique_id: gate_template
      device_class: door
      state: "{{ is_state( 'binary_sensor.basementgate_gate', 'on' ) }}"
      icon: |
        {% if is_state( 'binary_sensor.basementgate_gate', 'on' ) %}
        mdi:gate-open
        {% else %}
        mdi:gate
        {% endif %}

I figured I might as well use one of the fancy Adafruit Perma-Proto boards I had, which makes soldering all of the connections much easier. As a bonus it was nearly a perfect fit for the case.

The magnetic switch and Si7021 will live outside the box, so those couldn’t get soldered yet. After connecting power I checked the ESPHome logs to make sure everything was working.

I cut holes in a project box, finished soldering, and used hot glue to secure the board..

I reversed the swing of the gate, placed my device, and attached the two sides of the magnetic switch to the gate.

In Home Assistant an automation runs whenever the stairs light is turned off to check the state of the gate. If it’s open, a notification is sent to our phones.