from machine import Pin, PWM
import time, math

red   = PWM(Pin(15)); red.freq(1000)
green = PWM(Pin(14)); green.freq(1000)
blue  = PWM(Pin(13)); blue.freq(1000)

def set_rgb_pwm(r, g, b):
    red.duty_u16(r); green.duty_u16(g); blue.duty_u16(b)

print("レインボーグラデーション開始")
t = 0.0

while True:
    val_r = int((math.sin(t)       + 1) * 32767.5)
    val_g = int((math.sin(t+2.094) + 1) * 32767.5)
    val_b = int((math.sin(t+4.189) + 1) * 32767.5)
    set_rgb_pwm(val_r, val_g, val_b)
    time.sleep(0.05)
    t += 0.05