feat(heater): add more temp sources & heating modes

[alexcekay]

Solved Problem

This addresses multiple topics observed while developing a more complex heater

• The current heater can only listen to sensor_accel.
• Currently the update rate is limited by the refresh rate of a temperature source, which is problematic for temperature drivers with slow update rate
• It is not possible to set the IMAX term (integrator clamp)
• The design can not handle variable heater supply voltage

Solution

• Add support to get temperature from sensor_hygrometer. The structure also allows adding more sources in the future
• Add a HEATER_FAST_UPDATE_MODE to Kconfig. This allows using the last received temperature for up to a defined timeout where the heater will be turned off for safety reasons. The fast update is needed for slow temperature sources, otherwise the heater will be turned off most of the time and will not heat enough. If this is not set everything behaves as previously
• Add a param to set the IMAX term
• Add a HEATER${I}_NOM_V parameter. With this it is possible to set the nominal voltage the controller was designed. This is also the voltage the heater network can sustain with 100% duty cycle. A higher supply voltage will adapt the controller output accordingly to not overload the heater network. This requires reading supply voltage and will disable the heater when no supply voltage can be read. If the parameter is not set everything behaves as previously.

Test coverage

• Tested the HEATER_FAST_UPDATE_MODE with a new product with a quite strong heater network

[github-actions]

🔎 FLASH Analysis

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Updated: 2026-05-19T16:48:40

[dakejahl]

Very nice. Share some logs once you have them