from machine import Pin
import time

led = Pin(16, Pin.OUT)
# Setup button on GP15 as an input with a Pull-Down resistor
button = Pin(27, Pin.IN, Pin.PULL_DOWN) 
led.value(0) #start with LED off
print("Click and hold button for LED to glow")

while True:
    if button.value() == 1:  # If button is pressed (connected to 3.3V)
        led.value(1)
        #time.sleep(0.5)        # Turn LED ON
    else:
        led.value(0)        # Turn LED OFF
        #time.sleep(0.5)          # Small delay to save CPU power