Use a History value with the current value to trigger a input_boolean

Configuration
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4

Thank you all. You guys help me to starting up with it. I don’t get it worked so you describe it but It works.
For te people who’ve intrested.

automation on:

alias: Regenschakelaar aan
description: ''
trigger:
  - platform: time_pattern
    seconds: /5
condition:
  - condition: template
    value_template: >-
      {{ (((states('sensor.rain_sensor') | float -
      states('sensor.regen_history') | float) / -2)) > 0 }}
action:
  - scene: scene.regenschakelaar_aan
mode: single

Automation off

alias: Regenschakelaar uit
description: ''
trigger:
  - platform: time_pattern
    seconds: /5
condition:
  - condition: state
    entity_id: input_boolean.regen
    state: 'on'
  - condition: template
    value_template: >-
      {{ (((states('sensor.rain_sensor') | float -
      states('sensor.regen_history') | float) / 5)) > 0 }}
action:
  - scene: scene.regenschakelaar_uit
mode: single

extra configuration setting:

#sensor om de huidige waarde mee te vergelijken    
  - platform: sql
    queries:
      - name: regen history
        query: "SELECT * FROM states WHERE entity_id = 'sensor.rain_sensor' ORDER BY state_id DESC LIMIT 1;" 
        column: "state"