Blink on-board LED on RP2040

[last updated: 2024-09-17]
RP2040-Zero home page
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• The RP2040-Zero on-board LED:
  is not a standard LED, ie. with a single control pin that you can just turn on and off
  by writing to a single GPIO

  
  In fact it is a "neoPixel", actually RGB

• This is what worked to write to it:
  
  import machine, neopixel
  from time import sleep
  LEDpin = 16
  led = neopixel.NeoPixel(machine.Pin(LEDpin), 1)
  led[0] = (0, 0, 255) # blue
  led.write()
  sleep(1)
  led[0] = (0, 0, 0) # off
  led.write()