Last Updated or created 2024-03-11

I used to have a “professional” alarm system, but it was too limited.

But when making a new alarm system using Home Assistant I thought I could reuse some sensors and the very loud alarm.

Setting up the Alarm within HA was as described on the HA website.
I made a group for door and motion sensors.
Then I made groups for lighting and switches.

Now I can “ARM” the house.

• Motion sensors like PIR and camera sensors are being used for detection.
• Lights and sound will be turned on when motion is detected.
• When arming the system, the siren mode of the camera’s is also turned on.
• When intrusion is detected I get a pushover notification on my phone and watch.

The siren is about 4-5 Euro’s on Ali
https://nl.aliexpress.com/item/1005006066524139.html

Schematic of the wemos controller

Used mosfet is a N-Channel 30N06L, resistor is 10K

ESPHome code

esphome:
  name: bigalarm
  friendly_name: BigAlarm

esp8266:
  board: d1_mini

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "1xxfIYKv6tpzt7HQKYOxxxxxxxxTBETHkmy7cwDE="

ota:
  password: "5d23a3af438fe0xxxxxxxx2ff29ab6"

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Bigalarm Fallback Hotspot"
    password: "6muixxxxxoA"

captive_portal:

output:
  - platform: gpio
    pin: 0
    id: 'generic_out'
switch:
  - platform: output
    name: "BigAlarm"
    output: 'generic_out'