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.

Home Assistant Settings

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

Future work

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