Add example from @Mihai258

source/_cookbook/automation_flashing_lights.markdown

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+---
+layout: page
+title: "Examples for flashing lights"
+description: "Automation examples for flashing lights in case of an alarm."
+date: 2016-03-30 08:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Automation Examples
+---
+
+#### {% linkable_title Flashing lights triggered by an alarm %}
+
+For flashing regular lights in case the the triggering of an alarm.
+
+```yaml
+# AlmAct1 - switch to activate the alarm in Room1
+# AlmSnd1 - switch for a buzzer
+
+automation:
+- alias: 'Alarm_PIR_Room1'
+  trigger:
+    platform: state
+    entity_id: binary_sensor.PIR1
+    state: 'on'
+  condition:
+    - platform: state
+      entity_id: switch.AlmAct1
+      state: 'on'
+    - platform: state
+      entity_id: script.alarm_room1
+      state: 'off'
+  action:
+    # start alarm on movement if alarm activated
+    # and the alarm is not triggered
+    service: script.turn_on
+    entity_id: script.alarm_room1
+
+- alias: 'flash_room1_start'
+  trigger:
+    platform: state
+    entity_id: switch.AlmSnd1
+    state: 'on'
+  action:
+    service: script.turn_on
+    entity_id: script.flash_room1
+
+- alias: 'flash_room1_stop'
+  trigger:
+    platform: state
+    entity_id: switch.REL1
+    state: 'off'
+  condition:
+    platform: state
+    entity_id: switch.AlmSnd1
+    state: 'off'
+  action:
+    service: script.turn_off
+    entity_id: script.flash_room1
+
+script:
+  alarm_room1:
+    alias: Alarm room1
+    sequence:
+      - alias: Alarm Room1 Start
+        service: homeassistant.turn_on
+        data:
+          entity_id: switch.AlmSnd1
+      - alias: Set Ack Room1
+        service: homeassistant.turn_on
+        data:
+          entity_id: input_boolean.ack1
+      - alias: email_Room1
+        service: notify.email
+        data:
+          message: 'Movement alarm in Room1'
+      - delay:
+          # time interval for alarm sound and light flashing
+          seconds: 60
+      - alias: Alarm Room1 Stop
+        service: homeassistant.turn_off
+        data:
+          entity_id: switch.AlmSnd1
+
+  flash_room1:
+    alias: Flash Room1 On
+    sequence:
+      - alias: Light Room1 On
+        service: homeassistant.turn_on
+        data:
+          entity_id: switch.REL1
+      - delay:
+          # time for flash light on
+          seconds: 1
+      - alias: Light Room1 Off
+        service: homeassistant.turn_off
+        data:
+          entity_id: switch.REL1
+      - delay:
+          # time for flash light off
+          seconds: 1
+      - alias: loop_room1
+        service: script.turn_on
+        data:
+          entity_id: script.flash_room1
+```
+