PWM pulse generation with esp32 and esphome

ESPHome
1

I want to generate with an esp32 a square signal of 1khz frequency pulses and with square pulses of 10% on and 90% off. I understand that if the frequency is 1Khz the “update_interval” parameter will be 1ms and “transition_lenght” 0.1ms:

effects:
   - pulse:
      name: "Pulse"
      update_interval: 1ms
       transition_length: 0.1ms

But I get the message “Maximum precision is milliseconds.”!!

I think that a frequency of 1Khz is quite normal, and I am surprised that a signal of this type cannot be generated.

Am I wrong about something, or is it really that this type of signal cannot be generated?

Thank you so much

2

Ledc component is not ok for you?

3

I’ve tested ledc, with this configuration:

> output:
>   - platform: ledc
>     pin: GPIO32
>     frequency: 1000  # Frecuencia en Hz
>     id: cargador_pwm_output
>     max_power: 1.0
> 
>  light:
>   - platform: monochromatic
>      output: cargador_pwm_output
>     name: "Cargador"
>      restore_mode: ALWAYS_ON
>      id: cargador
>      on_turn_on: 
>        then:
>           - light.turn_on:
>               id: cargador
>               brightness: 10%

If I mesure the voltage is 0.33V (10% of 3.3V) so I think the output is not square it seems proporcional to the brightness.t doesn’t look like a square sign

4

On your oscilloscope or logic analyser?

1 Like
5

Using ledc component to generate PWM signal for gas valve modulation.
It working perfect. Highly recommend to use oscillosope to control waveform.