Hey there, can someone point me in the right direction? I can't figure out the "wait_until" condition.

I want to push the button, record the start_pulse_count, turn_on the relay, wait until the pulse_counter counts 50 pulses, and then turn_off the relay.

I'm trying to create a water dispenser that dispenses a set amount of water at the push of a button. Okay, I admit it, it's to fill the reservoir on my coffee machine.

# Button      
binary_sensor:
  - platform: gpio
    pin: 
      number: D7
      mode: INPUT_PULLUP
      inverted: True
    name: "button1"
    on_press:
      then:
        - globals.set:
            id: start_pulse_count
            value: (id(pulses_counted).state)
        - switch.turn_on: relay1
        - wait_until:
            (id(pulses_counted).state) == (id(start_pulse_count).state)   50
        - switch.turn_off: relay1

EDIT: I understand the concept of lamdas. But I'm not clear on when they need to be used. I suspect this may be one of those cases.

EDIT: Full yaml file here: https://pastebin.com/suj3MwN8