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Pulse Nodes

A pulse is a short, rectangular electrical signal used for measurement, detection, and controlling switches. These nodes can be used to utilize the pulse and PWM (pulse width mondulation) functionality in your flows.

Config Nodes​

pwm write config​

Handles settings for pulse wave generation on a specified pin.

Inputs

  • Output Pin : Specify the output pin number to send pwm signal
  • Resolution : Set the bit resolution (smallest detectable change in a pulse signal) for the pulse signal
  • Timer : Select the timer for the pulse signal
  • Ledc Channel : Select the LEDC Channel (used to control the brightness or color of an LED using PWM)
  • Clock : Select the clock to use for signal generation
  • Speed Mode : Select the speed mode for the signal

Proc Nodes​

pwm write​

Enables production of square wave (alternating 1 and 0) on the specified pin with a frequency and duty cycle(%). (a PWM generator)

Inputs

  • Config : Select the pwm configuration
  • Intensity (%) : Specify the Intensity/Duty cycle in percentage (%)
  • Frequency (Hz) : Specify the frequency of the pwm signal
  • H point : Specify H Point (reference point for the start of a pulse) in percentage (%)

pwm sound​

Enables production of sound wave (alternating 1 and 0) on the specified pin with a frequency. (a PWM generator)

Inputs

  • Output : Select the pwm configuration
  • Switch : Turn on/off the pin signal
  • Tone (Hz) : Specify the tone frequency to send

pwm duty resolution​

Used to find the duty_resolution

Inputs

  • Config : Select the PWM write configuration
  • Source clock frequency : Select the source clock for the PWM duty cycle resolution
  • Timer(frequency) : Specify the time frequency

Outputs

  • Duty resolution : Duty resolution of the PWM duty cycle

pwm stop​

Used to stop the led

Inputs

  • Config : Select the PWM write configuration
  • Idle level : Specify the idle level of PWM signal

pwm set frequency​

Used to set the frequency.

Inputs

  • Config : Select the PWM write configuration
  • Frequency (hz) : Specify the frequency for PWM signal

pwm get frequency​

Used to get the frequency.

Inputs

  • Config : Select the PWM write configuration

Outputs

  • Frequency (hz) : Frequency of the PWM signal

pwm set duty cycle and hpoint​

Used to set the duty cycle and the h point value

Inputs

  • Config : Select the PWM write configuration
  • Duty : Specify the duty cycle of the pwm signal
  • H point : Specify the H point for the pwm signal

pwm get duty hpoint​

Used to set the duty value the h point value

Inputs

  • Config : Select the PWM write configuration

Outputs

  • H point : Hpoint parameter in the ledc_channel_config_t structure specifies the point in the PWM cycle where the duty cycle is applied.

pwm get duty​

Used to set the duty value and get the duty value

Inputs

  • Config : Select the PWM write configuration

Outputs

  • Duty : Duty parameter specifies the duty cycle of the PWM signal, determining the proportion of time the signal is high within each period.

pwm fade function install​

Used to install the fade function.This will occupy the interrupt of LEDC Module

Inputs

  • Fade function install : Installs the LEDC fade service, enabling smooth transitions in duty cycle.

pwm set fade function​

This is used to set the LEDC gradient

Inputs

  • Config : Select the PWM write configuration
  • Duty : Duty parameter specifies the duty cycle of the PWM signal, determining the proportion of time the signal is high within each period.
  • Fade direction : Fade direction parameter specifies the direction of the fade operation, determining whether the PWM duty cycle increases or decreases over time.
  • Step num : Step num parameter specifies the number of steps over which the PWM duty cycle transitions during a fade operation
  • Duty cycle num : The duty cycle is determined by the duty parameter, which specifies the duty cycle of the PWM signal, determining the proportion of time the signal is high within each period.
  • Duty scale : Duty scale parameter specifies the scaling factor for the duty cycle during a fade operation

pwm timer Set​

This is used to set the timer

Inputs

  • Config : Select the PWM write configuration
  • Clock divider : Clock divider parameter specifies the division factor applied to the selected clock source
  • Source clock frequency : Source clock frequency determines the maximum achievable PWM frequency and duty resolution

pwm timer reset​

This is used to reset the timer

Inputs

  • Config : Select the PWM write configuration

pwm bind channel timer​

This is used to bind the LEDC channel with the selected timer

Inputs

  • Config : Select the PWM write configuration

pwm set fade time and start​

A thread-safe API to set and start LEDC fade function, with a limited time.

Inputs

  • Config : Select the PWM write configuration
  • Target duty : Target duty parameter specifies the desired duty cycle for a PWM signal during a fade operation
  • Max fade time(ms) : Max fade time ms parameter specifies the maximum duration, in milliseconds, over which the PWM duty cycle should transition to the target duty during a fade operation.
  • Fade mode : The fade mode parameter determines how the fade operation is executed

pwm set fade step and start​

A thread-safe API to set and start LEDC fade function.

Inputs

  • Config : Select the PWM write configuration
  • Target duty : Target duty parameter specifies the desired duty cycle for a PWM signal during a fade operation
  • Scale : Scale parameter specifies the scaling factor for the duty cycle during a fade operation
  • Cycle num : Cycle num parameter specifies the number of PWM cycles over which a fade operation should occur
  • Fade mode : The fade mode parameter determines how the fade operation is executed

pwm set duty and update​

A thread-safe API to set duty for LEDC channel and return when duty updated.

Inputs

  • Config : Select the PWM write configuration
  • Duty : Duty parameter specifies the duty cycle of the PWM signal, determining the proportion of time the signal is high within each period.
  • H point : Hpoint parameter in the ledc_channel_config_t structure specifies the point in the PWM cycle where the duty cycle is applied.