Alarm Hack

Hacking a Crow Runner alarm system with esp8266

Setup

Currently I connected into just the door sensor.
When open, the signal is about 2.48V.
Reading the volage on the analog pin (A0) and sending MQTT message 'open' in the value is above 400 or 'closed' otherwise.

sensor:
  - platform: mqtt
    name: "Door"
    state_topic: "sensor/door"

Hack more sensors through the digital pins (At 2.48V the signal should register as HIGH on a digital pin)