It’s a PWM computer fan speed controller. 12VDC Noctua fans with 5VDC PWM speed control. YAML code is providing five levels of fan:
- OFF
- LOW
- MEDIUM
- HIGH
- MAXIMUM
Pretty much everything is working as expected, EXCEPT:
When the fan initially powers on at LOW speed, PWM is providing 100% of the speed_counter: 1000 value.
YAML code in ESPHome:
esphome:
name: computer-rack-fans
esp8266:
board: esp12e
# Enable logging
logger:
level: DEBUG
# Enable Home Assistant API
api:
password: !secret api_password
ota:
password: !secret ota_password
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
switch:
- platform: gpio
id: fan_power
name: "Fan Power"
pin: GPIO5
inverted: false
- platform: template
id: fan_speed_off
turn_on_action:
- logger.log:
format: "The temperature sensor reports value %.1f, fans are OFF"
args: [ 'id(rack_temp_f).state' ]
level: INFO
- lambda: |-
id(rack_fan_speed).publish_state("Off");
- switch.turn_off:
id: fan_power
- fan.turn_off:
id: fan_pwm
- platform: template
id: fan_speed_low
turn_on_action:
- logger.log:
format: "The temperature sensor reports value %.1f, fans are LOW"
args: [ 'id(rack_temp_f).state' ]
level: INFO
- lambda: |-
id(rack_fan_speed).publish_state("Low");
- fan.turn_on:
id: fan_pwm
speed: 750
- switch.turn_on:
id: fan_power
- platform: template
id: fan_speed_medium
turn_on_action:
- logger.log:
format: "The temperature sensor reports value %.1f, fans are MEDIUM"
args: [ 'id(rack_temp_f).state' ]
level: INFO
- lambda: |-
id(rack_fan_speed).publish_state("Medium");
- fan.turn_on:
id: fan_pwm
speed: 500
- switch.turn_on:
id: fan_power
- platform: template
id: fan_speed_high
turn_on_action:
- logger.log:
format: "The temperature sensor reports value %.1f, fans are HIGH"
args: [ 'id(rack_temp_f).state' ]
level: INFO
- lambda: |-
id(rack_fan_speed).publish_state("High");
- fan.turn_on:
id: fan_pwm
speed: 250
- switch.turn_on:
id: fan_power
- platform: template
id: fan_speed_max
turn_on_action:
- logger.log:
format: "The temperature sensor reports value %.1f, fans are MAXIMUM"
args: [ 'id(rack_temp_f).state' ]
level: INFO
- lambda: |-
id(rack_fan_speed).publish_state("MAXIMUM");
- fan.turn_on:
id: fan_pwm
speed: 1
- switch.turn_on:
id: fan_power
sensor:
platform: dht
model: dht22
update_interval: 10sec
pin: GPIO14
temperature:
id: rack_temp_f
unit_of_measurement: "°F"
filters:
lambda: |-
return (x * 1.8) + 32.0;
on_value_range:
- below: 75.0
then:
switch.turn_on: fan_speed_off
- above: 75.1
below: 77.0
then:
switch.turn_on: fan_speed_low
- above: 77.1
below: 79.0
then:
switch.turn_on: fan_speed_medium
- above: 79.1
below: 80.0
then:
switch.turn_on: fan_speed_high
- above: 80.1
then:
switch.turn_on: fan_speed_max
#
# Text sensor provides literal speed
# Off / Low / Medium / High / MAXIMUM
#
text_sensor:
platform: template
id: rack_fan_speed
name: "Rack Fan Speed"
#
# fan_power is a relay switching 12VDC fan power on and off
# pwm_output is a speed control line to the PWM fan
#
output:
- platform: esp8266_pwm
pin: GPIO12
frequency: 25000 Hz
id: pwm_output
#
# The fan object
#
fan:
- platform: speed
id: fan_pwm
name: "Rack Fan PWM"
output: pwm_output
speed_count: 1000
restore_mode: ALWAYS_OFF
The ESPHome log output when it initially switches on to LOW speed:
[08:35:17][D][sensor:124]: 'rack_temp_f': Sending state 73.94000 °F with 1 decimals of accuracy
[08:35:27][D][dht:048]: Got Temperature=23.8°C Humidity=50.3%
[08:35:27][D][sensor:124]: 'rack_temp_f': Sending state 74.84000 °F with 1 decimals of accuracy
[08:35:37][D][dht:048]: Got Temperature=24.4°C Humidity=49.6%
[08:35:37][D][sensor:124]: 'rack_temp_f': Sending state 75.92000 °F with 1 decimals of accuracy
[08:35:37][D][switch:013]: 'fan_speed_low' Turning ON.
[08:35:37][I][main:046]: The temperature sensor reports value 75.9, fans are LOW
[08:35:37][D][text_sensor:067]: 'Rack Fan Speed': Sending state 'Low'
[08:35:37][D][fan:022]: 'Rack Fan PWM' - Setting:
[08:35:37][D][fan:025]: State: ON
[08:35:37][D][fan:029]: Speed: 1000
[08:35:37][D][fan:108]: 'Rack Fan PWM' - Sending state:
[08:35:37][D][fan:109]: State: ON
[08:35:37][D][fan:111]: Speed: 1000
[08:35:37][D][switch:013]: 'Fan Power' Turning ON.
[08:35:37][D][switch:037]: 'Fan Power': Sending state ON
[08:35:42][D][text_sensor:067]: 'Rack Fan Speed': Sending state 'Low'
After going through other speeds/states, the LOW setting works as expected:
[09:10:42][D][text_sensor:067]: 'Rack Fan Speed': Sending state 'Medium'
[09:10:47][D][dht:048]: Got Temperature=25.3°C Humidity=39.7%
[09:10:47][D][sensor:124]: 'rack_temp_f': Sending state 77.54000 °F with 1 decimals of accuracy
[09:10:57][D][dht:048]: Got Temperature=25.2°C Humidity=39.7%
[09:10:57][D][sensor:124]: 'rack_temp_f': Sending state 77.36000 °F with 1 decimals of accuracy
[09:11:07][D][dht:048]: Got Temperature=25.2°C Humidity=39.8%
[09:11:07][D][sensor:124]: 'rack_temp_f': Sending state 77.36000 °F with 1 decimals of accuracy
[09:11:17][D][dht:048]: Got Temperature=25.1°C Humidity=39.8%
[09:11:17][D][sensor:124]: 'rack_temp_f': Sending state 77.18000 °F with 1 decimals of accuracy
[09:11:27][D][dht:048]: Got Temperature=25.0°C Humidity=39.9%
[09:11:27][D][sensor:124]: 'rack_temp_f': Sending state 77.00000 °F with 1 decimals of accuracy
[09:11:27][D][switch:013]: 'fan_speed_low' Turning ON.
[09:11:27][I][main:046]: The temperature sensor reports value 77.0, fans are LOW
[09:11:27][D][text_sensor:067]: 'Rack Fan Speed': Sending state 'Low'
[09:11:27][D][fan:022]: 'Rack Fan PWM' - Setting:
[09:11:27][D][fan:025]: State: ON
[09:11:27][D][fan:029]: Speed: 750
[09:11:27][D][fan:108]: 'Rack Fan PWM' - Sending state:
[09:11:27][D][fan:109]: State: ON
[09:11:27][D][fan:111]: Speed: 750
[09:11:27][D][switch:013]: 'Fan Power' Turning ON.
[09:11:37][D][dht:048]: Got Temperature=25.0°C Humidity=39.9%
[09:11:37][D][sensor:124]: 'rack_temp_f': Sending state 77.00000 °F with 1 decimals of accuracy
[09:11:42][D][text_sensor:067]: 'Rack Fan Speed': Sending state 'Low'