this post was submitted on 01 Nov 2024
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Thanks for the suggsetion @Matt The Horwood.
It looks like a "Combine the state of several sensors" or a "Group" helper only allow you to combine sensors of the same type.
I created a binary sensor from a template using the helper, but it also returns "'binary_sensor' is undefined" when I try to access its value in the template editor with
{{ states(binary_sensor.lounge_presence) }}