import time
from machine import Pin, PWM

# ── Servomoteur sur GP12 ─────────────────────────────────────────────────────
servo = PWM(Pin(10))
servo.freq(50)  # 50 Hz standard pour les servos

def angle_vers_duty(angle):
    """Convertit un angle (0–180°) en duty cycle u16"""
    min_us = 500    # 0.5 ms → 0°
    max_us = 2500   # 2.5 ms → 180°
    us = min_us + (max_us - min_us) * angle / 180
    return int(us * 65535 / 20000)

print("=" * 40)
print("   BALAYAGE SERVO 0° → 180° → 0°")
print("=" * 40)

while True:
    # ── Aller : 0° → 180° ───────────────────────
    print("\n▶ Aller : 0° → 180°")
    for angle in range(0, 181, 10):
        servo.duty_u16(angle_vers_duty(angle))
        print(f"   → {angle:>3}°  {'█' * (angle // 10)}")
        time.sleep(0.4)

    time.sleep(0.5)

    # ── Retour : 180° → 0° ──────────────────────
    print("\n◀ Retour : 180° → 0°")
    for angle in range(180, -1, -10):
        servo.duty_u16(angle_vers_duty(angle))
        print(f"   → {angle:>3}°  {'█' * (angle // 10)}")
        time.sleep(0.4)

    time.sleep(0.5)