print("Hello, ESP32!")

#####################################
###### IMPORT LIBRARIES
from machine import Pin
from time import sleep

#####################################
###### PIN CONFIGURATIONS
# Configure the LED and Pushbutton pins
pin_led = Pin(21, Pin.OUT)
pin_pb = Pin(2, Pin.IN)

#####################################
###### SUBROUTINE FOR INTERRUPT
# This function is triggered on pushbutton press
def interrupt_pb(pin):
    print('Interrupt by:', pin)
    pin_led.on()
    sleep(1)  # LED stays ON for 5 seconds
    pin_led.off()
    sleep(1)

# Interrupt trigger on falling edge (button push)
pin_pb.irq(trigger=Pin.IRQ_FALLING, handler=interrupt_pb)

#####################################
###### MAIN ROUTINE
def main():
    while True:
        # LED stays off unless interrupted
        pin_led.off()
        sleep(10)

#####################################
###### EXECUTE MAIN ROUTINE
if __name__ == '__main__':
    main()