import machine
import utime

# For Pi Pico
#led_onboard = machine.Pin(25, machine.Pin.OUT)

led_onboard = machine.Pin("LED", machine.Pin.OUT)
Led_external = machine.Pin(15, machine.Pin.OUT)

led_onboard.value(1)
Led_external.value(0)
utime.sleep(1)

while True:
    led_onboard.toggle()
    Led_external.toggle()
    utime.sleep(.5)
    led_onboard.toggle()
    Led_external.toggle()
    utime.sleep(1)
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pi-pico-w