Pulse Width Modulation (PWM)

Introduction

Pulse Width Modulation (PWM) outputs a timed pulse signal from a 3-Wire port, letting the V5 Brain control legacy motor controllers or servos by varying the pulse width (duty cycle) every 16 milliseconds (ms).

Note: Pwm objects generate a raw RC-style PWM waveform:

• 0% output produces a 1.5 ms pulse.

• 100% output produces a 2.0 ms pulse.

• -100% output produces a 1.0 ms pulse.

This page uses pwm_a as the example PWM output’s name. Replace it with your own configured name as needed.

Below is a list of available methods:

• value – Returns the PWM output’s current value.

• state – Sets the PWM output’s value.

Constructor – Manually initialize and configure a PWM output.

• Pwm – Create a PWM output.

value

value returns the PWM output’s value from -100 to 100 as a percent.

Usage:
pwm_a.value()

Parameters	Description
	This method has no parameters.

state

state sets the state of the PWM output as a percent.

Usage:
pwm_a.state(value)

Parameters	Description
value	The value to set for the PWM output, from -100 to 100.

Constructor

Constructors are used to create Pwm objects, which are necessary for configuring a PWM output.

Pwm

Pwm creates a PWM output.

Usage:
Pwm(port)

Parameter	Description
port	The 3-Wire Port that the PWM output is connected to: On the V5 Brain – brain.three_wire_port.x where x is the number of the port. On a 3-Wire Expander – expander.a where expander is the name of the expander instance.

# Create a PWM output in Port A
pwm_a = Pwm(brain.three_wire_port.a)