from machine import Pin,ADC
import time
but = Pin(15,Pin.IN)
ldr = ADC(Pin(26))
state = True
while state:
    ldr_val = ldr.read_u16()
    time.sleep(0.1)
    print(ldr_val)
    if but.value():
        print(f"Captured={ldr_val}")
        state = False