Meat aging input_boolean. When the appended daily average temperature hits 40 degrees celcius, alert my phone. Possible?

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I would suggest using a sensor to record the cumulative temperature hours.

You can zero the sensor, then accumulate the hourly temperature.

Then have a rule to alert you when the limit (40 or 960 is reached).

By making it a sensor, you can see the trend and any anomalies in the data (ie if an hour is missed etc).

From the trend, you can extrapolate a likely finish time also.

Have a look at how I did a rainfall sensor for some inspiration for the sensor.

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