Which sensor for baby presence detection in a room?

[walberjunior]

weird i have mmwave sensors and they detect breath movement.

You can create a sensor template

Subtracting two values from two sensors in a template

You’ve been bit by the “floats don’t have infinite precision” fact. First, you don’t need to round each term of the equation, you can round the sum, which is probably better anyway. But, still, this can happen. What you really need to do is not round, but specify an output format. E.g.: # Calculate Remaining Power - platform: template sensors: remaining_power: value_template: > {{ '%0.1f' | format(states('sensor.energy_meter_mains_power') | float - …