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fan: Add tachometer support

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This adds new config options for fans:  'tachometer_pin' to specify the
GPIO pin, and 'tachometer_ppr' (default 2) to specify the number of
signal pulses per revolution.  The rpm is also exposed by get_status for
command templates and the API server.  For fast fans (at least 10000
RPM), the polling interval can be shortened using the
'tachometer_poll_interval' option.

There is a new mcu object for a generic edge counter, which repeatedly
polls a GPIO pin and periodically reports the count to the host.

Signed-off-by: Adrian Keet <arkeet@gmail.com>
This commit is contained in:
Adrian Keet 2021-02-06 15:11:29 -08:00 • committed by KevinOConnor
parent f8b0ea53dc
commit 16d85d1a78
5 changed files with 238 additions and 2 deletions
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25
docs/Config_Reference.md
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@ -2226,6 +2226,19 @@ pin:
# input speed which reliably drives the fan without stalls. Set
# off_below to the duty cycle corresponding to this value (for
# example, 12% -> 0.12) or slightly higher.
#tachometer_pin:
# Tachometer input pin for monitoring fan speed. A pullup is generally
# required. This parameter is optional.
#tachometer_ppr: 2
# When tachometer_pin is specified, this is the number of pulses per
# revolution of the tachometer signal. For a BLDC fan this is
# normally half the number of poles. The default is 2.
#tachometer_poll_interval: 0.0015
# When tachometer_pin is specified, this is the polling period of the
# tachometer pin, in seconds. The default is 0.0015, which is fast
# enough for fans below 10000 RPM at 2 PPR. This must be smaller than
# 30/(tachometer_ppr*rpm), with some margin, where rpm is the
# maximum speed (in RPM) of the fan.
```
## [heater_fan]
@ -2244,6 +2257,9 @@ a shutdown_speed equal to max_power.
#hardware_pwm:
#kick_start_time:
#off_below:
#tachometer_pin:
#tachometer_ppr:
#tachometer_poll_interval:
# See the "fan" section for a description of the above parameters.
#heater: extruder
# Name of the config section defining the heater that this fan is
@ -2277,6 +2293,9 @@ watched component.
#hardware_pwm:
#kick_start_time:
#off_below:
#tachometer_pin:
#tachometer_ppr:
#tachometer_poll_interval:
# See the "fan" section for a description of the above parameters.
#fan_speed: 1.0
# The fan speed (expressed as a value from 0.0 to 1.0) that the fan
@ -2317,6 +2336,9 @@ additional information.
#hardware_pwm:
#kick_start_time:
#off_below:
#tachometer_pin:
#tachometer_ppr:
#tachometer_poll_interval:
# See the "fan" section for a description of the above parameters.
#sensor_type:
#sensor_pin:
@ -2362,6 +2384,9 @@ with the SET_FAN_SPEED
#hardware_pwm:
#kick_start_time:
#off_below:
#tachometer_pin:
#tachometer_ppr:
#tachometer_poll_interval:
# See the "fan" section for a description of the above parameters.
```