Initial sketch

PyPortal_UV_Index/code.py

@@ -11,3 +11,84 @@ Licensed under the MIT license.
 
 All text above must be included in any redistribution.
 """
+
+import time
+import board
+import json
+import displayio
+from adafruit_pyportal import PyPortal
+from adafruit_display_shapes.rect import Rect
+from adafruit_display_text.Label import Label
+from adafruit_bitmap_font import bitmap_font
+
+try:
+    from secrets import secrets
+except ImportError:
+    print("""WiFi settings are kept in secrets.py, please add them there!
+the secrets dictionary must contain 'ssid' and 'password' at a minimum""")
+    raise
+
+MAX_BAR_HEIGHT = 160
+MARGIN = 10
+SPACE_BETWEEN_BARS = 1
+
+COLORS = [0x00FF00, 0x83C602, 0xa2CF02,
+          0xF7DE03, 0xF6B502, 0xF78802,
+          0xF65201, 0xEA2709,
+          0xDA0115, 0xFC019E, 0xB548FF,
+          0x988FFE, 0x7EA7FE, 0x66BFFD, 0x4BD9FF]
+
+cwd = ("/"+__file__).rsplit('/', 1)[0]
+
+CAPTION_FONT_FILE = cwd+'/fonts/Helvetica-Bold-16.bdf'
+TEXT_FONT_FILE = cwd+'/fonts/Helvetica-Bold-16.bdf'
+HOUR_FONT_FILE = cwd+'/fonts/Arial-12.bdf'
+
+def halt_and_catch_fire(message, *args):
+    """Log a critical error and stall the system."""
+    print(message % args)
+    while True:
+        pass
+
+url = 'https://enviro.epa.gov/enviro/efservice/getEnvirofactsUVHOURLY/ZIP/{0}/JSON'.format(secrets['zip'])
+
+
+# Initialize the pyportal object and let us know what data to fetch and where
+# to display it
+pyportal = PyPortal(url=url,
+                    status_neopixel=board.NEOPIXEL,
+                    default_bg=0xFFFFFF,
+                    text_font=TEXT_FONT_FILE,
+                    text_position=(20, 60),
+                    text_color=0xFFFFFF,
+                    text_wrap=35,
+                    caption_text='UV Index',
+                    caption_font=CAPTION_FONT_FILE,
+                    caption_position=(5, 20),
+                    caption_color=0x000000)
+
+def extract_hour(date_time):
+    return '\n'.join(date_time.split()[1:3])
+
+data = [{'hour': extract_hour(d['DATE_TIME']), 'value': d['UV_VALUE']} for d in json.loads(pyportal.fetch()) if d['UV_VALUE'] > 0]
+
+number_of_readings = len(data)
+
+whitespace = (number_of_readings - 1) * SPACE_BETWEEN_BARS + 2 * MARGIN
+bar_width = (320 - whitespace) // number_of_readings
+
+max_reading = max([d['value'] for d in data])
+
+canvas = displayio.Group(max_size=24)
+pyportal.splash.append(canvas)
+hour_font = bitmap_font.load_font(HOUR_FONT_FILE)
+
+for i, reading in enumerate(data):
+    bar_height = (MAX_BAR_HEIGHT * reading['value']) // max_reading
+    x = MARGIN + i * (bar_width + SPACE_BETWEEN_BARS)
+    canvas.append(Rect(x, 200 - bar_height, bar_width, bar_height, fill=COLORS[reading['value']]))
+    text = Label( hour_font, x=x, y=220, text=reading['hour'], color=0x000000, line_spacing=0.8)
+    canvas.append(text)
+
+while True:
+    pass