Is it possible to adjust the PWM frequency of the LEDC from the HA with a number template?
Finding the “right” frequency for various motors when they work well and more importantly silent is tedious task because of the recompiling.
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Did you try user defined actions with variables from HA? 
Once the number helper is brought into the esp with the home assistant component. Under that entry use an on_value trigger with the linked action.
https://esphome.io/components/output/ledc.html#output-ledc-set-frequency-action
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I have already tried that, but somethings is not right.
I see the values changing in the esphome log as I adjust them in the HA, but it seams it does not actually change the PWM frequency value.
This is my code:
number:
- platform: template
id: pwmFreq
name: PWM Frequency
icon: mdi:sync
optimistic: true
min_value: 10
max_value: 1000
initial_value: 10
step: 10
on_value:
- output.ledc.set_frequency:
id: pwm_a
frequency: 100Hz
fan:
- platform: speed
output: pwm_a
name: "Vent"
speed_count: 3
output:
- platform: ledc
id: pwm_a
pin: 19
frequency: 10 Hz
power_supply: psu
min_power: 33%
max_power: 100%
power_supply:
- id: 'psu'
pin:
number: 21
inverted: false
You have the frequency set at a fixed number, 100. You have to return the value of the number.
frequency: !lambda 'return id(pwmFreq).state';
Thanks for the reply, but that does not compile.
ERROR Error while reading config: Invalid YAML syntax:
while parsing a block mapping
in "/config/esphome/test200.yaml", line 45, column 11
expected <block end>, but found '<scalar>'
in "/config/esphome/test200.yaml", line 46, column 56
Are you saying this is how the code should look like?
number:
- platform: template
id: pwmFreq
name: PWM Frequency
icon: mdi:sync
optimistic: true
min_value: 10
max_value: 1000
initial_value: 10
step: 10
on_value:
- output.ledc.set_frequency:
id: pwm_a
frequency: !lambda 'return id(pwmFreq).state';
fan:
- platform: speed
output: pwm_a
name: "Vent"
speed_count: 3
output:
- platform: ledc
id: pwm_a
pin: 19
frequency: 10 Hz
power_supply: psu
min_power: 33%
max_power: 100%
power_supply:
- id: 'psu'
pin:
number: 21
inverted: false
Yes. I don’t think that error is from the lambda. Open the nodes yaml, line 46, 56th character is where the error is. Post the full yaml if you can’t find it.
This is the full code. It was working before I added lambda
56th character is the end of the lambda
if I take out “;” it also does not work
esphome:
name: test200
friendly_name: test200
esp32:
board: esp32dev
framework:
type: arduino
# Enable logging
logger:
# Enable Home Assistant API
api:
encryption:
key: "xAP+XHCM5uqlds+JO5e3VRX8B4HXLA1lZUjU0KWr9ac="
ota:
- platform: esphome
password: "b0fed970247ce6544ae4c876b4f87e91"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Test200 Fallback Hotspot"
password: "4airnlN4OnLx"
captive_portal:
number:
- platform: template
id: pwmFreq
name: PWM Frequency
icon: mdi:sync
optimistic: true
min_value: 10
max_value: 1000
initial_value: 10
step: 10
on_value:
- output.ledc.set_frequency:
id: pwm_a
frequency: !lambda 'return id(pwmFreq).state';
fan:
- platform: speed
output: pwm_a
name: "Vent"
speed_count: 3
output:
- platform: ledc
id: pwm_a
pin: 19
frequency: 10 Hz
power_supply: psu
min_power: 33%
max_power: 100%
power_supply:
- id: 'psu'
pin:
number: 21
inverted: false
It looks like the frequency can’t be hard coded under output. Remove the key. it will default to 1000 at start until you change the value of the number. If that is a problem at boot you can set the pwm to 10 with
esphome:
name: test200
friendly_name: test200
on_boot:
priority: -100
then:
- output.ledc.set_frequency:
id: pwm_a
frequency: 10
output:
- platform: ledc
id: pwm_a
pin: 19
power_supply: psu
min_power: 33%
max_power: 100%
still does not compile…
ERROR Error while reading config: Invalid YAML syntax:
while parsing a block mapping
in "/config/esphome/test200.yaml", line 51, column 11
expected <block end>, but found '<scalar>'
in "/config/esphome/test200.yaml", line 52, column 56
full code…
esphome:
name: test200
friendly_name: test200
on_boot:
priority: -100
then:
- output.ledc.set_frequency:
id: pwm_a
frequency: 10
esp32:
board: esp32dev
framework:
type: arduino
# Enable logging
logger:
# Enable Home Assistant API
api:
encryption:
key: "xAP+XHCM5uqlds+JO5e3VRX8B4HXLA1lZUjU0KWr9ac="
ota:
- platform: esphome
password: "b0fed970247ce6544ae4c876b4f87e91"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Test200 Fallback Hotspot"
password: "4airnlN4OnLx"
captive_portal:
number:
- platform: template
id: pwmFreq
name: PWM Frequency
icon: mdi:sync
optimistic: true
min_value: 10
max_value: 1000
initial_value: 10
step: 10
on_value:
- output.ledc.set_frequency:
id: pwm_a
frequency: !lambda 'return id(pwmFreq).state';
fan:
- platform: speed
output: pwm_a
name: "Vent"
speed_count: 3
output:
- platform: ledc
id: pwm_a
pin: 19
power_supply: psu
min_power: 33%
max_power: 100%
power_supply:
- id: 'psu'
pin:
number: 21
inverted: false
I pulled this off someone’s blog. It compiles but I don’t have an esp handy to test it.
esphome:
name: test200
friendly_name: test200
esp32:
board: esp32dev
framework:
type: arduino
# Enable logging
logger:
# Enable Home Assistant API
api:
encryption:
key: "xAP+XHCM5uqlds+JO5e3VRX8B4HXLA1lZUjU0KWr9ac="
ota:
- platform: esphome
password: "b0fed970247ce6544ae4c876b4f87e91"
wifi:
ssid: xxxxxxxxx
password: xxxxxxxxxxx
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Test200 Fallback Hotspot"
password: "4airnlN4OnLx"
captive_portal:
number:
- platform: template
id: pwmFreq
name: PWM Frequency
icon: mdi:sync
optimistic: true
unit_of_measurement: 'Hz'
min_value: 10
max_value: 1000
initial_value: 10
step: 10
on_value:
lambda: |-
int newFreq = (int)(10000000.0*id(pwmFreq).state)+1000;
id(pwm_a).update_frequency(newFreq);
fan:
- platform: speed
output: pwm_a
name: "Vent"
speed_count: 3
output:
- platform: ledc
id: pwm_a
pin: 19
# power_supply: psu
# min_power: 33%
# max_power: 100%
power_supply:
- id: 'psu'
pin:
number: 21
inverted: false
Yes, it compiles, but when I change the frequency, I get this error in the log.
[19:11:54][E][ledc.output:202]: Frequency -2147482624.000000 can't be achieved with any bit depth
[19:11:54][E][component:164]: Component ledc.output set Error flag: unspecified
[19:11:54][E][component:176]: Component ledc.output cleared Error flag
[19:11:58][D][number:054]: 'PWM Frequency' - Setting number value
[19:11:58][D][number:113]: New number value: 320.000000
[19:11:58][D][number:012]: 'PWM Frequency': Sending state 320.000000
[19:11:58][E][ledc.output:202]: Frequency -2147482624.000000 can't be achieved with any bit depth
[19:11:58][E][component:164]: Component ledc.output set Error flag: unspecified
[19:11:58][E][component:176]: Component ledc.output cleared Error flag
[19:12:00][D][number:054]: 'PWM Frequency' - Setting number value
[19:12:00][D][number:113]: New number value: 330.000000
[19:12:00][D][number:012]: 'PWM Frequency': Sending state 330.000000
[19:12:00][E][ledc.output:202]: Frequency -2147482624.000000 can't be achieved with any bit depth
[19:12:00][E][component:164]: Component ledc.output set Error flag: unspecified
[19:12:00][E][component:176]: Component ledc.output cleared Error flag
I was able to get it working using the number value
lambda: |-
int newFreq = (int)(id(pwmFreq).state);
id(pwm_a).update_frequency(newFreq);
Thanks Mike. It compiles, but I am not able to test it as my motor driver is burned. I see how it look if I hook it to a LED.
EDIT: I have tested it with a LED, and it is working. Thank a lot once more.
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