123 lines
4 KiB
Python
123 lines
4 KiB
Python
"""
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PyPortal UV Index display
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Adafruit invests time and resources providing this open source code.
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Please support Adafruit and open source hardware by purchasing
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products from Adafruit!
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Written by Dave Astels for Adafruit Industries
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Copyright (c) 2019 Adafruit Industries
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Licensed under the MIT license.
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All text above must be included in any redistribution.
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"""
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import time
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import json
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import board
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import displayio
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from adafruit_pyportal import PyPortal
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from adafruit_display_shapes.rect import Rect
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from adafruit_display_text.Label import Label
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from adafruit_bitmap_font import bitmap_font
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try:
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from secrets import secrets
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except ImportError:
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print("""WiFi settings are kept in secrets.py, please add them there!
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the secrets dictionary must contain 'ssid' and 'password' at a minimum""")
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raise
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MAX_BAR_HEIGHT = 160
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MARGIN = 10
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SPACE_BETWEEN_BARS = 1
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COLORS = [0x00FF00, 0x83C602, 0xa2CF02,
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0xF7DE03, 0xF6B502, 0xF78802,
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0xF65201, 0xEA2709,
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0xDA0115, 0xFC019E, 0xB548FF,
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0x988FFE, 0x7EA7FE, 0x66BFFD, 0x4BD9FF]
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cwd = ("/"+__file__).rsplit('/', 1)[0]
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CAPTION_FONT_FILE = cwd+'/fonts/Helvetica-Bold-16.bdf'
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BAR_FONT_FILE = cwd+'/fonts/Arial-Bold-12.bdf'
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#pylint:disable=line-too-long
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url = 'https://enviro.epa.gov/enviro/efservice/getEnvirofactsUVHOURLY/ZIP/{0}/JSON'.format(secrets['zip'])
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#pylint:enable=line-too-long
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def extract_hour(date_time):
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"""Extract the hour in a format to use for display:
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:param date_time: the timestamp from EPA UV readings
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"""
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split_date_time = date_time.split()
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hour = split_date_time[1]
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suffix = split_date_time[2]
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if hour[0] == '0':
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hour = hour[1]
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return '\n'.join([hour, suffix])
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def extract_date(date_time):
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"""Extract the date in a format to use for display:
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:param date_time: the timestamp from EPA UV readings
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"""
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return ' '.join(date_time.split('/')[0:2])
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pyportal = PyPortal(url=url,
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status_neopixel=board.NEOPIXEL,
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default_bg=0xFFFFFF,
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caption_font=CAPTION_FONT_FILE)
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canvas = displayio.Group()
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pyportal.splash.append(canvas)
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bar_font = bitmap_font.load_font(BAR_FONT_FILE)
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while True:
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json_payload = ''
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try:
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json_payload = pyportal.fetch()
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raw_data = json.loads(json_payload)
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except (ValueError, RuntimeError) as ex:
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print('Error: ', ex)
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if isinstance(ex, ValueError):
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print('JSON:', json_payload)
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print('Retrying in 10 minutes')
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time.sleep(600)
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continue
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data = []
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for d in raw_data:
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if d['UV_VALUE'] > 0:
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entry = {}
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entry['hour'] = extract_hour(d['DATE_TIME'])
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entry['value'] = int(d['UV_VALUE'])
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data.append(entry)
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the_day = raw_data[0]['DATE_TIME']
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pyportal.set_caption('UV Index for {0}'.format(extract_date(the_day)),
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(80, 20),
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0x000000)
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number_of_readings = len(data)
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whitespace = (number_of_readings - 1) * SPACE_BETWEEN_BARS + 2 * MARGIN
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bar_width = (320 - whitespace) // number_of_readings
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max_reading = max([d['value'] for d in data])
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while len(canvas) > 0:
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canvas.pop()
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for i, reading in enumerate(data):
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bar_height = (MAX_BAR_HEIGHT * reading['value']) // max_reading
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x = int(MARGIN + i * (bar_width + SPACE_BETWEEN_BARS))
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canvas.append(Rect(x, 200 - bar_height,
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bar_width, bar_height,
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fill=COLORS[reading['value']]))
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canvas.append(Label(bar_font,
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x=x+3, y=220,
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text=reading['hour'],
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color=0x000000,
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line_spacing=0.6))
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canvas.append(Label(bar_font,
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x=x+(bar_width//2)-4, y=208-bar_height,
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text=str(reading['value']),
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color=0x000000))
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time.sleep(3600) #refresh hourly
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