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Modified the calculate_brightness function to reduce flickering on gu

This commit is contained in:
Irvin Makosa 2023-08-02 23:33:15 +01:00
parent 0b0474e062
commit 462724210c
1 changed files with 21 additions and 12 deletions
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33
micropython/examples/galactic_unicorn/light_sensor.py
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@ -30,6 +30,9 @@ MAX_LS_VALUE = 295 # 4095 to use the full range
MIN_RANGE = 0.1
MAX_RANGE = 1
# Rate of display change
TRANSITION_RATE = 1.0 / 32.0
# perform linear interpolation to map a range of values to discrete
def map_range(
@ -45,9 +48,14 @@ def map_range(
# gets the light sensor value from onboard sensor and interpolates it
# clamps the brightness values
def calculate_brightness(current_lsv):
brightness_val = map_range(current_lsv)
# clamps the brightness value it outside the ranges specified
def calculate_brightness(prev_brightness_val):
current_lsv = gu.light()
current_brightness_val = map_range(current_lsv)
# uses the previous value to smooth out display changes reducing flickering
brightness_diff = current_brightness_val - prev_brightness_val
brightness_val = prev_brightness_val + (brightness_diff * TRANSITION_RATE)
if brightness_val > 1:
brightness_val = 1
elif brightness_val < 0.1:
@ -59,7 +67,7 @@ def calculate_brightness(current_lsv):
# draws percentage icon
def draw_percentage(x, y):
graphics.rectangle(x + 1, y + 1, 2, 2)
graphics.line(x, y + 6, x + 6, y)
graphics.line(x + 1, y + 5, x + 6, y)
graphics.rectangle(x + 4, y + 4, 2, 2)
@ -69,17 +77,17 @@ def clear():
graphics.clear()
mode = "auto"
mode = "auto" # set auto brightness on
last = time.ticks_ms()
brightness_value = MIN_RANGE # set the initial brightness level to the minimum
while True:
current = time.ticks_ms()
# get light sensor value from the sensor
ls_value = gu.light()
brightness_value = calculate_brightness(ls_value)
# set the display brightness
brightness_value = calculate_brightness(brightness_value)
gu.set_brightness(brightness_value)
# calculate brightness percentage
bp = (brightness_value / MAX_RANGE) * 100
bp = (brightness_value / MAX_RANGE) * 100 # gets brightness value in percentage relative to the MAX_LS_VALUE set
# deactivate auto brightness by pressing A
if gu.is_pressed(GalacticUnicorn.SWITCH_A):
@ -110,10 +118,11 @@ while True:
# draw the text
graphics.set_pen(CURRENT_COLOUR)
graphics.text("BRT: ", 0, 1, scale=1)
# measure the rest of the text before drawing to right align it
text_width = graphics.measure_text(f"{bp:.0f}/°", scale=1)
text_width = graphics.measure_text(f"{bp:.0f} ", scale=1)
graphics.text(f"{bp:.0f}", WIDTH - text_width, 1, scale=1)
draw_percentage((WIDTH - text_width) + 10, 1)
draw_percentage((WIDTH - 8), 1)
# draw a bar for the background
graphics.set_pen(GREY)