1  # SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
 2  # SPDX-License-Identifier: MIT
 3  """
 4  CircuitPython Essentials Storage CP Filesystem code.py file
 5  
 6  For use with boards that have a built-in NeoPixel or NeoPixels, but no little red LED.
 7  
 8  It will use only one pixel as an indicator, even if there is more than one NeoPixel.
 9  """
10  import time
11  import board
12  import microcontroller
13  import neopixel
14  
15  pixel = neopixel.NeoPixel(board.NEOPIXEL, 1)
16  
17  try:
18      with open("/temperature.txt", "a") as temp_log:
19          while True:
20              # The microcontroller temperature in Celsius. Include the
21              # math to do the C to F conversion here, if desired.
22              temperature = microcontroller.cpu.temperature
23  
24              # Write the temperature to the temperature.txt file every 10 seconds.
25              temp_log.write('{0:.2f}\n'.format(temperature))
26              temp_log.flush()
27  
28              # Blink the NeoPixel on every write...
29              pixel.fill((255, 0, 0))
30              time.sleep(1)  # ...for one second.
31              pixel.fill((0, 0, 0))  # Then turn it off...
32              time.sleep(9)  # ...for the other 9 seconds.
33  
34  except OSError as e:  # When the filesystem is NOT writable by CircuitPython...
35      delay = 0.5  # ...blink the NeoPixel every half second.
36      if e.args[0] == 28:  # If the file system is full...
37          delay = 0.15  # ...blink the NeoPixel every 0.15 seconds!
38      while True:
39          pixel.fill((255, 0, 0))
40          time.sleep(delay)
41          pixel.fill((0, 0, 0))
42          time.sleep(delay)