vpd.yaml

      vapor_deficit:
        friendly_name: 'VPD in kilo pascals'
        value_template: >-        
          {% set T = states('sensor.growtent_temp') | float %}
          {% set RH = states('sensor.growtent_humidity') | float %}
          {% set t = states('input_number.leaf_temperature') | float %}
          {% set VPSat = 610.7 * 10 ** (7.5 * t / (t + 237.3)) / 1000 %}
          {% set VPAir = (610.7 * 10 ** (7.5 * T / (T + 237.3)) / 1000) * (RH/100) %}
          {% set VPD = VPSat - VPAir %}
          {{- VPD | round(2) -}}
        unit_of_measurement: 'kPa'
        icon_template: >-
            mdi:gauge