from machine import Pin, PWM
import time

# Set up PWM on Pin 17 with a high frequency (1000Hz)
pwm = PWM(Pin(5))
pwm.freq(1000)

STEPS = 100

while True:
    # --- RAMP UP (Triangle rising edge) ---
    for i in range(STEPS + 1):
        # MicroPython duty cycles go from 0 to 65535
        duty = int((i / STEPS) * 65535)
        pwm.duty_u16(duty)
        time.sleep_ms(5)
        
    # Optional: Un-comment the line below to make it Trapezoidal!
    # time.sleep_ms(200) 
        
    # --- RAMP DOWN (Triangle falling edge) ---
    for i in range(STEPS, -1, -1):
        duty = int((i / STEPS) * 65535)
        pwm.duty_u16(duty)
        time.sleep_ms(5)
        
    # Optional: Un-comment the line below to make it Trapezoidal!
    # time.sleep_ms(200)