141 lines
4.4 KiB
Python
141 lines
4.4 KiB
Python
import time
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from galactic import GalacticUnicorn
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from picographics import PicoGraphics, DISPLAY_GALACTIC_UNICORN as DISPLAY
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"""
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Light sensoring feature for the galactic unicorn
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Uses the onboard light sensor to detect the light in the environment
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The brightness level is displayed as percentage.
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Brightness of the display is auto adjusted to the brightness level of the environment
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Press A to turn auto brightness on
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Press B to turn auto brightness off
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"""
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# set up unicorn and drawing variables
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gu = GalacticUnicorn()
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graphics = PicoGraphics(DISPLAY)
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WIDTH, HEIGHT = graphics.get_bounds()
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BLACK = graphics.create_pen(0, 0, 0)
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WHITE = graphics.create_pen(255, 255, 255)
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GREY = graphics.create_pen(20, 20, 20)
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HUE_START = 0
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HUE_END = 100
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graphics.set_font("bitmap8")
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# Text display sleep time in ms
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TEXT_SLEEP = 500
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# the onboard light sensor has a wide range from 0 t0 4095
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# It is therefore needed to set a lower max and a higher minimum
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MIN_LS_VALUE = 10
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MAX_LS_VALUE = 295 # 4095 to use the full range
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MIN_RANGE = 0.1
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MAX_RANGE = 1
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# Rate of display change i.e the lower the value the slower the transition
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TRANSITION_RATE = 1.0 / 72.0
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# perform linear interpolation to map a range of values to discrete
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def map_range(
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x,
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min_input=MIN_LS_VALUE,
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max_input=MAX_LS_VALUE,
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min_output=MIN_RANGE,
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max_output=MAX_RANGE,
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):
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return (x - min_input) * (max_output - min_output) / (
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max_input - min_input
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) + min_output
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# gets the light sensor value from onboard sensor and interpolates it
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# clamps the brightness value it outside the ranges specified
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def calculate_brightness(prev_brightness_val):
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current_lsv = gu.light()
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current_brightness_val = map_range(current_lsv)
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# uses the previous value to smooth out display changes reducing flickering
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brightness_diff = current_brightness_val - prev_brightness_val
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brightness_val = prev_brightness_val + (brightness_diff * TRANSITION_RATE)
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if brightness_val > 1:
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brightness_val = 1
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elif brightness_val < 0.1:
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brightness_val = 0.1
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return brightness_val
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# draws percentage icon
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def draw_percentage(x, y):
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graphics.rectangle(x + 1, y + 1, 2, 2)
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graphics.line(x + 1, y + 5, x + 6, y)
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graphics.rectangle(x + 4, y + 4, 2, 2)
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# sets up a handy function we can call to clear the screen
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def clear():
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graphics.set_pen(BLACK)
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graphics.clear()
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mode = "auto" # set auto brightness on
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last = time.ticks_ms()
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brightness_value = MIN_RANGE # set the initial brightness level to the specified minimum
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while True:
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current = time.ticks_ms()
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# set the display brightness
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brightness_value = calculate_brightness(brightness_value)
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gu.set_brightness(brightness_value)
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bp = (brightness_value / MAX_RANGE) * 100 # gets brightness value in percentage relative to the MAX_LS_VALUE set
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# deactivate auto brightness by pressing A
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if gu.is_pressed(GalacticUnicorn.SWITCH_A):
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print("Auto brightness off")
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mode = "off"
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# reactivate auto brightness by pressing A
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if gu.is_pressed(GalacticUnicorn.SWITCH_B):
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print("Auto brightness on")
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mode = "auto"
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# set brightness to default value if off
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if mode == "off":
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gu.set_brightness(0.5)
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# set text update rate after a certain time to reduce flickering
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if current - last >= TEXT_SLEEP:
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clear()
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# calculate colour from the brightness value
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hue = max(0, HUE_START + ((bp - 0) * (HUE_END - HUE_START) / (100 - 0)))
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# create pens with this colour (and with the high / low colours)
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CURRENT_COLOUR = graphics.create_pen_hsv(hue / 360, 1.0, 0.8)
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HIGH_COLOUR = graphics.create_pen_hsv(HUE_END / 360, 1.0, 0.8)
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LOW_COLOUR = graphics.create_pen_hsv(HUE_START / 360, 1.0, 0.8)
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# draw the text
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graphics.set_pen(CURRENT_COLOUR)
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graphics.text("BRT: ", 0, 1, scale=1)
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# measure the rest of the text before drawing to right align it
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text_width = graphics.measure_text(f"{bp:.0f} ", scale=1)
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graphics.text(f"{bp:.0f}", WIDTH - text_width, 1, scale=1)
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draw_percentage((WIDTH - 8), 1)
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# draw a bar for the background
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graphics.set_pen(GREY)
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graphics.rectangle(0, 9, WIDTH, 10)
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# draw a bar for the current brightness percentage
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graphics.set_pen(CURRENT_COLOUR)
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graphics.rectangle(0, 9, int((bp / 100) * WIDTH), 10)
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last = current
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# time to update the display
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gu.update(graphics)
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