[SAMR21 New Gameplay] 22. PWM

dcexpert

[SAMR21 New Gameplay] 22. PWM [Copy link]

 

The PWM function is in the pulseio module. It is also very easy to use, such as:

import pulseio
import board

pwm = pulseio.PWMOut(board.D13, frequency=50)
pwm.duty_cycle = 2 ** 15

The duty cycle of the PWM output can be adjusted through the duty_cycle parameter, which ranges from 0 to 65535.

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dcexpert

On SAMR21, we can use the PWM function to make a breathing light:

import time
import pulseio
from microcontroller import pin

pwm = pulseio.PWMOut(pin.PA19)
n = 0

while 1:
    pwm.duty_cycle = abs(65535 - n*4096)
    n = (n + 1)%32
    time.sleep(0.05)

The changing algorithm of the breathing light is different from before and is simpler now.