350 lines
11 KiB
Python
350 lines
11 KiB
Python
import time
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from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
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import displayio
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import adafruit_imageload
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from adafruit_ble_cycling_speed_and_cadence import CyclingSpeedAndCadenceService
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from adafruit_ble_heart_rate import HeartRateService
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from adafruit_bitmap_font import bitmap_font
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from adafruit_display_shapes.rect import Rect
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from adafruit_display_text import label
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class Pyloton:
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_previous_wheel = 0
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_previous_crank = 0
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_previous_revolutions = 0
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_previous_crank_rev = 0
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_previous_speed = 0
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_previous_cadence = 0
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_previous_heart = 0
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splash = displayio.Group(max_size=25)
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setup = False
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YELLOW = 0xFCFF00
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PURPLE = 0x64337E
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WHITE = 0xFFFFFF
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loading_group = displayio.Group()
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cyc_connections = []
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cyc_services = []
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def __init__(self, ble, display, circ, heart=True, speed=True, cad=True, ams=True, debug=False):
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self.debug = debug
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self.ble = ble
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self.display = display
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self.circumference = circ
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self.heart_enabled = heart
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self.speed_enabled = speed
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self.cadence_enabled = cad
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self.ams_enabled = ams
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self.hr_connection = None
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self.num_enabled = heart + speed + cad + ams
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self._load_fonts()
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self.sprite_sheet, self.palette = adafruit_imageload.load("/sprite_sheet.bmp",
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bitmap=displayio.Bitmap,
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palette=displayio.Palette)
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def show_splash(self):
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"""
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Shows the loading screen
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"""
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if self.debug:
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return
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with open('biketrace.bmp', 'rb') as bitmap_file:
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bitmap1 = displayio.OnDiskBitmap(bitmap_file)
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tile_grid = displayio.TileGrid(bitmap1, pixel_shader=displayio.ColorConverter())
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self.loading_group.append(tile_grid)
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self.display.show(self.loading_group)
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status_heading = label.Label(font=self.arial16, x=80, y=175,
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text="Status", color=self.YELLOW)
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rect = Rect(0, 165, 240, 75, fill=self.PURPLE)
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self.loading_group.append(rect)
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self.loading_group.append(status_heading)
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self.display.show(self.loading_group)
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time.sleep(.01)
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def _load_fonts(self):
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"""
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Loads fonts
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"""
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self.arial12 = bitmap_font.load_font("/fonts/Arial-12.bdf")
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self.arial16 = bitmap_font.load_font("/fonts/Arial-16.bdf")
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self.arial24 = bitmap_font.load_font("/fonts/Arial-Bold-24.bdf")
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def _status_update(self, message):
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"""
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Displays status updates
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"""
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if self.debug:
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print(message)
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return
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text_group = displayio.Group()
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if len(message) > 25:
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status = label.Label(font=self.arial12, x=10, y=200,
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text=message[:25], color=self.YELLOW)
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status1 = label.Label(font=self.arial12, x=10, y=220,
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text=message[25:], color=self.YELLOW)
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text_group.append(status)
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text_group.append(status1)
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else:
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status = label.Label(font=self.arial12, x=10, y=200, text=message, color=self.YELLOW)
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text_group.append(status)
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if len(self.loading_group) < 4:
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self.loading_group.append(text_group)
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else:
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self.loading_group[3] = text_group
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self.display.show(self.loading_group)
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time.sleep(0.01)
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def timeout(self):
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"""
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Displays Timeout on screen when pyloton has been searching for a sensor for too long
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"""
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self._status_update("Timeout")
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time.sleep(3)
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def heart_connect(self):
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"""
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Connects to heart rate sensor
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"""
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self._status_update("Scanning...")
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for adv in self.ble.start_scan(ProvideServicesAdvertisement, timeout=5):
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if HeartRateService in adv.services:
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self._status_update("Found a HeartRateService advertisement")
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self.hr_connection = self.ble.connect(adv)
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self._status_update("Connected")
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break
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return self.hr_connection
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def speed_cad_connect(self):
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"""
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Connects to speed and cadence sensor
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"""
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self._status_update("Scanning...")
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# Save advertisements, indexed by address
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advs = {}
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for adv in self.ble.start_scan(ProvideServicesAdvertisement, timeout=5):
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if CyclingSpeedAndCadenceService in adv.services:
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self._status_update("found a CyclingSpeedAndCadenceService advertisement")
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# Save advertisement. Overwrite duplicates from same address (device).
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advs[adv.address] = adv
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self.ble.stop_scan()
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self._status_update("Speed and Cadence: Stopped scanning")
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if not advs:
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# Nothing found. Go back and keep looking.
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return []
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# Connect to all available CSC sensors.
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self.cyc_connections = []
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for adv in advs.values():
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self.cyc_connections.append(self.ble.connect(adv))
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self._status_update("Connected {}".format(len(self.cyc_connections)))
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self.cyc_services = []
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for conn in self.cyc_connections:
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self.cyc_services.append(conn[CyclingSpeedAndCadenceService])
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self._status_update("Finishing up...")
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return self.cyc_connections
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def read_s_and_c(self):
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"""
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Reads data from the speed and cadence sensor
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"""
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speed = self._previous_speed
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cadence = self._previous_cadence
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for conn, svc in zip(self.cyc_connections, self.cyc_services):
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if conn.connected:
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values = svc.measurement_values
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if values is not None:
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if values.last_wheel_event_time:
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wheel_diff = values.last_wheel_event_time - self._previous_wheel
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rev_diff = values.cumulative_wheel_revolutions - self._previous_revolutions
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if wheel_diff:
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# Rotations per minute is 60 times the amount of revolutions since
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# the last update over the time since the last update
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rpm = 60*(rev_diff/(wheel_diff/1024))
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# We then mutiply it by the wheel's circumference and convert it to mph
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speed = round((rpm * self.circumference) * (60/63360), 1)
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self._previous_speed = speed
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self._previous_revolutions = values.cumulative_wheel_revolutions
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self._previous_wheel = values.last_wheel_event_time
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if values.last_crank_event_time:
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crank_diff = values.last_crank_event_time - self._previous_crank
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crank_rev_diff =values.cumulative_crank_revolutions-self._previous_crank_rev
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if crank_rev_diff:
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# Rotations per minute is 60 times the amount of revolutions since the
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# last update over the time since the last update
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cadence = round(60*(crank_rev_diff/(crank_diff/1024)), 1)
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self._previous_cadence = cadence
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self._previous_crank_rev = values.cumulative_crank_revolutions
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self._previous_crank = values.last_crank_event_time
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return speed, cadence
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return 0, 0
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def read_heart(self, hr_service):
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"""
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Reads date from the heart rate sensor
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"""
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measurement = hr_service.measurement_values
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if measurement is None:
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heart = self._previous_heart
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else:
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heart = measurement.heart_rate
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self._previous_heart = measurement.heart_rate
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return heart
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def icon_maker(self, n, icon_x, icon_y):
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"""
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Generates icons as sprites
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"""
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sprite = displayio.TileGrid(self.sprite_sheet, pixel_shader=self.palette, width=1,
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height=1, tile_width=40, tile_height=40, default_tile=n,
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x=icon_x, y=icon_y)
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return sprite
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def _label_maker(self, text, x, y):
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"""
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Generates labels
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"""
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return label.Label(font=self.arial24, x=x, y=y, text=text, color=self.WHITE)
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def _get_y(self):
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"""
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Helper function for setup_display. Gets the y values used for sprites and labels.
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"""
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enabled = self.num_enabled
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if self.heart_enabled:
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self.heart_y = 45*(self.num_enabled - enabled) + 75
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enabled -= 1
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if self.speed_enabled:
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self.speed_y = 45*(self.num_enabled - enabled) + 75
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enabled -= 1
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if self.cadence_enabled:
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self.cad_y = 45*(self.num_enabled - enabled) + 75
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enabled -= 1
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if self.ams_enabled:
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self.ams_y = 45*(self.num_enabled - enabled) + 75
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enabled -= 1
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def setup_display(self):
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"""
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Prepares the display to show sensor values: Adds a header, a heading, and various sprites.
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"""
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self._get_y()
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sprites = displayio.Group()
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rect = Rect(0, 0, 240, 50, fill=self.PURPLE)
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self.splash.append(rect)
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heading = label.Label(font=self.arial24, x=55, y=25, text="PyLoton", color=self.YELLOW)
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self.splash.append(heading)
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if self.heart_enabled:
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heart_sprite = self.icon_maker(0, 2, self.heart_y - 20)
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sprites.append(heart_sprite)
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if self.speed_enabled:
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speed_sprite = self.icon_maker(1, 2, self.speed_y - 20)
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sprites.append(speed_sprite)
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if self.cadence_enabled:
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cadence_sprite = self.icon_maker(2, 2, self.cad_y - 20)
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sprites.append(cadence_sprite)
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if self.ams_enabled:
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ams_sprite = self.icon_maker(3, 2, self.ams_y - 20)
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sprites.append(ams_sprite)
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self.splash.append(sprites)
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def update_display(self, hr_service):
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"""
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Updates the display to display the most recent values
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"""
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heart = self.read_heart(hr_service)
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speed, cadence = self.read_s_and_c()
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if self.heart_enabled:
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hr_label = self._label_maker('{} bpm'.format(heart), 50, self.heart_y) # 75
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if self.setup:
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self.splash[3] = hr_label
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else:
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self.splash.append(hr_label)
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if self.speed_enabled:
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sp_label = self._label_maker('{} mph'.format(speed), 50, self.speed_y) # 120
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if self.setup:
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self.splash[4] = sp_label
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else:
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self.splash.append(sp_label)
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if self.cadence_enabled:
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cad_label = self._label_maker('{} rpm'.format(cadence), 50, self.cad_y) # 165
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if self.setup:
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self.splash[5] = cad_label
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else:
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self.splash.append(cad_label)
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if self.ams_enabled:
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ams_label = self._label_maker('None', 50, self.ams_y) # 210
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if self.setup:
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self.splash[6] = ams_label
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else:
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self.splash.append(ams_label)
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self.setup=True
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self.display.show(self.splash)
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