# Making the windows smart

Home Assistant Dec 13, 2018

Having your windows connected to home assistant opens many possibilities. I've written down some ideas on what you could do with such information:

• 🚨 Create an alarm panel, so when a window is being opened while you are away, the siren rings and you get a text message
• 📱 Be notified which windows are still open before you leave
• 🌡️ Turn off the heater when someone opens a window
• ❄️ Ring a bell when the windows are open for too long
• ... and possibly much more

# How to do this

We will add magnet contacts to every window and wire them all to an ESP8266. There are other possibilities like using wireless contacts, but if you are on a budget or already have sensors pre-wired in your home this is a cheap and reliable way.

Let's begin with wiring everything together. The magnet contacts close the circuit when the magnet is near them, and is open when not. We will connect one wire of the contact to a digital pin. Not all pins are usable as inputs on the NodeMCU board, so make sure to connect to one of these pins: D0, D1, D2, D5, D6 or D7. You don't have to use four window contacts as I do but if you want to connect more than six you probably need to use a shift register to get more ports (or use another node).

## Writing the program

Using esphomeyaml, flashing the nodemcu becomes a no-brainer. If you already know yaml files from home assistant, it should be easy for you to follow.

### ESPHome

ESPHome is a great library from Otto Winter and makes it easy to write sketches for hardware devices based on ESPs using yaml-files for integration with home assistant.

To install ESPHome, visit the official documentation.

Keep in mind to alter the pins to your chosen ones. If you want to add contacts, just copy one of them and make sure all the indents are correct.

esphomeyaml:
name: window_contacts
platform: ESP8266
board: nodemcuv2

wifi:
ssid: !secret wifi_ssid

# Enable logging
logger:

ota:

api:

binary_sensor:
- platform: gpio
pin:
number: D1
mode: INPUT_PULLUP
name: "Small Window"
device_class: window

- platform: gpio
pin:
number: D2
mode: INPUT_PULLUP
name: "Balcony Door"
device_class: window

- platform: gpio
pin:
number: D6
mode: INPUT_PULLUP
name: "Wide Window"
device_class: window

- platform: gpio
pin:
number: D7
mode: INPUT_PULLUP
name: "Side Window"
device_class: window


Connect everything and run esphomeyaml window_contacts.yaml run.