# ==================================================
"""
Project objective: Blink four external LEDs connected to the Raspberry Pi Pico when a button is pressed

Hardware and connections used:
    Anode of four LEDs to GPIO pins 6-9 of Raspberry Pi Pico
    220 ohm resistor connected in series to each LED
    Push button to GPIO Pin 10 of Raspberry Pi Pico
    10k ohm pull-down resistor for the push button

Author: Adrian Josele G. Quional
"""
# ==================================================

# modules
from machine import Pin
from time import sleep

# setting GPIO Pins 6-9 as OUT for LEDs
# note: any GPIO pin can be used
LED1 = Pin(6, Pin.OUT)
LED2 = Pin(7, Pin.OUT)
LED3 = Pin(8, Pin.OUT)
LED4 = Pin(9, Pin.OUT)

# setting GPIO Pin 10 as IN for the button with a pull-down resistor
BUTTON = Pin(10, Pin.IN, Pin.PULL_DOWN)

# continuously check the button state and blink all 4 LEDs when the button is pressed
try:
    while True:
        if BUTTON.value() == 1:  # Button is pressed
            LED1.on()
            LED2.on()
            LED3.on()
            LED4.on()
            sleep(1)

            LED1.off()
            LED2.off()
            LED3.off()
            LED4.off()
            sleep(1)
        else:
            # Ensure LEDs are off when button is not pressed
            LED1.off()
            LED2.off()
            LED3.off()
            LED4.off()
            sleep(0.1)  # Small delay to debounce button

except KeyboardInterrupt:
    # Clean up GPIO settings before exiting
    LED1.off()
    LED2.off()
    LED3.off()
    LED4.off()