feat(bed-fans): Add chamber-temperature-driven bed fan control - #795
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feat(bed-fans): Add chamber-temperature-driven bed fan control#795mjonuschat wants to merge 1 commit into
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Adds an optional bed_fans hardware component that drives dedicated bed fans via a fan_generic + display_template, replacing the "fake chamber heater" hack (a heater_generic/verify_heater pair spoofing a fan as a heater) that has been circulating in the Klipper community to get proportional, temperature-driven fan behavior. Speed is a taper based on how far the chamber sensor is from the per-print target, clamped down while the bed heater's PWM duty cycle is high so the fans don't fight the bed heater during heatup, and gated to only run while the bed heater actually has a target (with a PARAM_FORCE override for manual/console testing). Auto-engages from _MODULE_HEATSOAK_BED and shuts down from END_PRINT/CANCEL_PRINT, following the same enabled-flag pattern as the existing recirculating filter support. Tunables are sourced from _USER_VARIABLES with defaults shipped in user_templates/variables.cfg. Validated live via Moonraker console commands on a real printer before landing: gate on/off, PARAM_FORCE bypass, chamber-temperature taper, and the bed-heatup clamp all produced the expected fan speeds.
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Summary
bed_fanshardware component (fan_generic+display_template) that drives dedicated bed fans off a chamber-temperature taper, replacing the "fake chamber heater" hack (heater_generic/verify_heaterspoofing a fan as a heater) that's been circulating in the Klipper community.PARAM_FORCEoverride for manual/console testing._MODULE_HEATSOAK_BEDand shuts down fromEND_PRINT/CANCEL_PRINT, following the same enabled-flag pattern as the existing recirculating filter support. Tunables are sourced from_USER_VARIABLESwith defaults shipped inuser_templates/variables.cfg.Test plan
multi_pin): gate on/off,PARAM_FORCEbypass, chamber-temperature taper, and the bed-heatup-power clamp all produced the expected fan speeds.FIRMWARE_RESTARTloads cleanly with the new hardware file included.