PWM — `pymcu.hal.pwm`#

from pymcu.hal.pwm import PWM

Hardware pulse-width modulation. Wraps the Timer/Counter OC channels on AVR.

class `PWM`#

`PWM(pin: str, duty: uint8)`#

Configures hardware PWM on the given pin. duty is 8-bit (0 = 0%, 255 = 100%).

Supported pins (ATmega328P)#

Pin	Arduino	Timer channel	Note
`"PD6"`	D6	Timer0 OC0A	Fast PWM, 8-bit
`"PD5"`	D5	Timer0 OC0B	Fast PWM, 8-bit
`"PB1"`	D9	Timer1 OC1A	Fast PWM, 8-bit
`"PB2"`	D10	Timer1 OC1B	Fast PWM, 8-bit
`"PB3"`	D11	Timer2 OC2A	Fast PWM, 8-bit
`"PD3"`	D3	Timer2 OC2B	Fast PWM, 8-bit

Methods#

Method	Description
`start()`	Enable PWM output
`stop()`	Disable PWM output
`set_duty(duty: uint8)`	Update duty cycle while running

Example#

LED fade#

from pymcu.hal.pwm import PWM
from pymcu.time import delay_ms
from pymcu.types import uint8

def main():
    pwm = PWM("PD6", duty=0)    # Timer0 OC0A (D6)
    pwm.start()

    duty: uint8 = 0
    while True:
        pwm.set_duty(duty)
        duty += 5
        delay_ms(20)

Servo control (50 Hz)#

from pymcu.hal.pwm import PWM
from pymcu.types import uint8

# Timer1 OC1A gives 16-bit resolution; set OCR1A directly for precision
from pymcu.types import ptr, uint16
OCR1A: ptr[uint16] = ptr(0x88)

pwm = PWM("PB1", duty=0)
pwm.start()

# 50 Hz servo: 1–2 ms pulse out of 20 ms period
# Prescaler 8, ICR1=40000 (20 ms), OCR1A=2000 (1 ms) to 4000 (2 ms)
OCR1A.value = 3000      # center position