pulseio --- Support for pulse based protocols

The pulseio module contains classes to provide access to basic pulse IO.

Libraries

• PulseIn -- Read a series of pulse durations
• PulseOut -- Output a pulse train
• PWMOut -- Output a Pulse Width Modulated signal

Warning

This module is not available in some SAMD21 builds. See the Support Matrix for more info.

All classes change hardware state and should be deinitialized when they are no longer needed if the program continues after use. To do so, either call deinit() or use a context manager. See Lifetime and ContextManagers for more info.

For example:

import pulseio
import time
from board import *

pwm = pulseio.PWMOut(D13)
pwm.duty_cycle = 2 ** 15
time.sleep(0.1)

This example will initialize the the device, set duty_cycle, and then sleep 0.1 seconds. CircuitPython will automatically turn off the PWM when it resets all hardware after program completion. Use deinit() or a with statement to do it yourself.