import time
from machine import Pin, PWM, ADC

time.sleep(0.1) # Wait for USB to become ready

print("Hello, Pi Pico!")

# buzzer on GP1 (PWM)
buzzer = PWM(Pin(1))
buzzer.duty_u16(32768)  # 50% volume

# potentiometer connected to GP28 (ADC2)
pot = ADC(Pin(28))

while True:
    val = pot.read_u16()         # Range: 0 to 65535
    freq = 200 + (val * 1800) // 65535  # Map to 200–2000 Hz
    buzzer.freq(freq)
    time.sleep(0.05)