from machine import Pin,PWM,ADC
import utime
led=Pin(16,Pin.OUT)
photoresistor=ADC(28)
buzzer=PWM(Pin(15))
light_low=65535
light_high=0
def interval_mapping(x,in_min,in_max,out_min,out_max):
    return (x-in_min)*(out_max-out_min)/(in_max-in_min)+out_min
def tone(pin,frequency,duration):
    pin.freq(frequency)
    pin.duty_u16(30000)
    utime.sleep_ms(duration)
    pin.duty_u16(0)
timer_init_start=utime.ticks_ms()
led.value(1)
while utime.ticks_diff(utime.ticks_ms(),timer_init_start)<5000:
    light_value=photoresistor.read_u16()
    if light_value>light_high:
        light_high=light_value
    if light_value<light_low:
        light_low=light_value
led.value(0)
while True:
    light_value=photoresistor.read_u16()
    pitch=int(interval_mapping(light_value,light_low,light_high,50,6000))
    if pitch>50:
        tone(buzzer,pitch,20)
    utime.sleep_ms(10)