Batch create multiple template sensors

Configuration
12

I found this thread and used the template proposed by @petro but I had to modify it to make it work

I think it could be useful for others also.
I had to fix some syntax otherwise sensors wouldn’t show, I also added the right device class for power and voltage sensors, as well as some rounding

sensor:
  - platform: template
    sensors:
{%- for i in range(states.sensor.iotawatt.attributes.inputs | length) %}
  {%- set input = states.sensor.iotawatt.attributes.inputs[i] %}
  {%- if input.Watts %}
      iotawatt_input_{{ input.channel }}:
        value_template: {{'\'{{{{ states.sensor.iotawatt.attributes.inputs[{}].Watts }}}}\''.format(i)}}
        unit_of_measurement: Watts

  {%- endif %}
{%- endfor %}
{%- for i in range(states.sensor.iotawatt.attributes.outputs | length) %}
  {%- set output = states.sensor.iotawatt.attributes.outputs[i] %}
      iotawatt_output_{{ output.name }}:
        value_template: {{'\'{{{{ states.sensor.iotawatt.attributes.outputs[{}].value }}}}\''.format(i)}}
        unit_of_measurement: {{ output.units }}
        {%- if output.units == 'Watts' %}
        device_class: power
        {%- elif output.units == 'Volts' %}
        device_class: voltage
        {%- endif %}
        
  {%- set output = states.sensor.iotawatt.attributes.outputs[i] %}
      iotawatt_output_{{ output.name }}_rounded:
        value_template: {{'\'{{{{ states.sensor.iotawatt.attributes.outputs[{}].value | round(0) }}}}\''.format(i)}}
        unit_of_measurement: {{ output.units }}
        {%- if output.units == 'Watts' %}
        device_class: power
        {%- elif output.units == 'Volts' %}
        device_class: voltage
        {%- endif %}        
{%- endfor %}

the template above creates 3 types of sensors:

  • inputs
  • outputs
  • outputs rounded

the rounded ones are useful for immediate data visualization, so that annoying decimals don’t show up in graphs and gauges