首先在此感谢oxlm大佬的帖子，学习一下，附上链接电子测光表DIY--初步成果基础任务+进阶任务一-电子产品世界论坛
修改了一下使引脚A0，A1默认都拉高，好像A0,A1如果拉低，其电压也会大于0，导致判断语句中误识别为高电位，导致莫名其妙的错误。
照度是指光线照射在物体表面上的强度，通常用勒克斯（lux）作为单位。照度越高，物体表面看起来越亮。照度是环境光线的客观度量，不受相机设置的影响。
快门（T）是指控制光线照射到感光元件上时间的机制。快门速度越快，感光元件接收光线的时间越短，需要更大的光圈或更高的感光度来补偿；快门速度越慢，感光元件接收光线的时间越长，可以使用更小的光圈或更低的感光度。
感光度是指相机感光元件对光线的敏感程度。ISO值越高，感光元件对光线的反应越敏感，可以在光线较暗的环境中使用更快的快门速度或更小的光圈；ISO值越低，感光元件对光线的反应越不敏感，需要更多的光线。
光圈是镜头中控制进光量的开口大小，通常用f-stop（f值）表示。f值越小，光圈开口越大，进光量越多，曝光时间可以更短或感光度可以更低；f值越大，光圈开口越小，进光量越少，曝光时间需要更长或感光度需要更高。
曝光（EV）是指相机感光元件（如胶片或数码传感器）接收光线的程度。正确的曝光意味着照片既不太亮（过曝），也不太暗（欠曝）。曝光由光圈、快门和感光度共同决定。
import time
import board
import terminalio
import displayio
import adafruit_bh1750
import math
from digitalio import DigitalInOut, Direction, Pull
from adafruit_display_text import label
from adafruit_bh1750 import Resolution
#keypad
KEY_NULL = 0
KEY_D0 = 1
KEY_D1 = 2
KEY_D2 = 4
key0 = DigitalInOut(board.BUTTON)
key1 = DigitalInOut(board.A0)
key2 = DigitalInOut(board.A1)
def keyInit():
key0.direction = Direction.INPUT
key0.pull = Pull.UP
key1.direction = Direction.INPUT
key1.pull = Pull.UP
key2.direction = Direction.INPUT
key2.pull = Pull.UP
def keyDetect():
key_value = KEY_NULL
if key0.value == 0:
key_value +=KEY_D0
if not key1.value:
key_value +=KEY_D1
if not key2.value:
key_value +=KEY_D2
return key_value
def isKeyPressed():
key_value = keyDetect()
if key_value:
time.sleep(0.1)
if key_value == keyDetect():
return key_value
return 0
# display
BORDER = 20
TEXT_HIGH = 26
FONTSCALE = 2
BACKGROUND_COLOR = 0xFFFFFF # White
FOREGROUND_COLOR = 0x855E42 # Dark Wood
TEXT_COLOR = 0x4D4DFF # Blue
TEXT_COLOR_WHITE = 0xf5ff33 # White
# BH1750
i2c = board.I2C()
sensor = adafruit_bh1750.BH1750(i2c)
AV = [
'1 ',
'1.4',
'2 ',
'2.8',
'4 ',
'5.6',
'8 ',
'11 ',
'16 ',
'22 ',
'32 '
]
TV = [
'1 ',
'1/2 ',
'1/4 ',
'1/8 ',
'1/15 ',
'1/30 ',
'1/60 ',
'1/125 ',
'1/250 ',
'1/500 ',
'1/1000'
]
SV = [
'100 ',
'200 ',
'400 ',
'800 ',
'1600'
]
def showCameraInfo(svIdx : int, avIdx : int):
lux = sensor.lux
ev = math.floor(2 + math.log(lux / 10) / math.log(2))
display = board.DISPLAY
splash = displayio.Group()
display.root_group = splash
text_Line0 = "LUX: " + ("%0.2f" % lux)
text_Line0_area = label.Label(terminalio.FONT, text=text_Line0, color=TEXT_COLOR)
text_Line0_group = displayio.Group(
scale=FONTSCALE, x=0, y=TEXT_HIGH // 2
)
text_Line0_group.append(text_Line0_area)
splash.append(text_Line0_group)
text_Line1 = "EV: " + str(ev)
text_Line1_area = label.Label(terminalio.FONT, text=text_Line1, color=TEXT_COLOR)
text_Line1_group = displayio.Group(
scale=FONTSCALE, x=0, y=TEXT_HIGH * 2 - TEXT_HIGH // 2
)
text_Line1_group.append(text_Line1_area)
splash.append(text_Line1_group)
text_Line2 = "f: " + AV[avIdx]
text_Line2_area = label.Label(terminalio.FONT, text=text_Line2, color=TEXT_COLOR)
text_Line2_group = displayio.Group(
scale=FONTSCALE, x=0, y=TEXT_HIGH * 3 - TEXT_HIGH // 2
)
text_Line2_group.append(text_Line2_area)
splash.append(text_Line2_group)
text_Line3 = "ISO: " + SV[svIdx]
text_Line3_area = label.Label(terminalio.FONT, text=text_Line3, color=TEXT_COLOR)
text_Line3_group = displayio.Group(
scale=FONTSCALE, x=0, y=TEXT_HIGH * 4 - TEXT_HIGH // 2
)
text_Line3_group.append(text_Line3_area)
splash.append(text_Line3_group)
text_Line4 = "T: " + TV[ev + svIdx - avIdx]
text_Line4_area = label.Label(terminalio.FONT, text=text_Line4, color=TEXT_COLOR)
text_Line4_group = displayio.Group(
scale=FONTSCALE, x=0, y=TEXT_HIGH * 5 - TEXT_HIGH // 2
)
text_Line4_group.append(text_Line4_area)
splash.append(text_Line4_group)
def cameraInfoHdl(old_key_value : int):
key_value = old_key_value
svIdx = 0
avIdx = 0
showCameraInfo(svIdx, avIdx)
while True:
key_value=isKeyPressed()
if old_key_value != key_value:
old_key_value = key_value
if key_value == KEY_D0:
break
elif key_value == KEY_D1:
svIdx += 1
if len(SV) <= svIdx :
svIdx = 0
showCameraInfo(svIdx, avIdx)
elif key_value == KEY_D2:
avIdx +=1
if avIdx >= len(AV):
avIdx = 0
showCameraInfo(svIdx, avIdx)
def showLux(mode : int):
display = board.DISPLAY
splash = displayio.Group()
display.root_group = splash
if mode == 0:
text_mode = "Mode High"
elif mode == 1:
text_mode = "Mode Low"
elif mode == 2:
text_mode = "Mode Middle"
text_mode_area = label.Label(terminalio.FONT, text=text_mode, color=TEXT_COLOR)
text_mode_group = displayio.Group(
scale=FONTSCALE, x=0, y=display.height // 4
)
text_mode_group.append(text_mode_area)
splash.append(text_mode_group)
text_lux = ("%0.2f" % sensor.lux) + "Lux"
text_lux_area = label.Label(terminalio.FONT, text=text_lux, color=TEXT_COLOR)
text_lux_group = displayio.Group(
scale=FONTSCALE, x=0, y=display.height // 2
)
text_lux_group.append(text_lux_area)
splash.append(text_lux_group)
def luxHdl(old_key_value : int):
key_value = old_key_value
i = 0
showLux(i)
while True:
key_value=isKeyPressed()
if old_key_value != key_value:
old_key_value = key_value
if key_value == KEY_D0:
break
elif key_value == KEY_D1:
i += 1
if i == 1:
sensor.set_mode(Resolution.LOW)
elif i == 2:
sensor.set_mode(Resolution.MID)
elif i == 3:
sensor.set_mode(Resolution.HIGH)
i = 0
showLux(i)
def showHelloEEPW():
display = board.DISPLAY
splash = displayio.Group()
display.root_group = splash
color_palette = displayio.Palette(1)
color_bitmap = displayio.Bitmap(display.width, display.height, 1)
color_palette[0] = BACKGROUND_COLOR
bg_sprite = displayio.TileGrid(color_bitmap, pixel_shader=color_palette, x=0, y=0)
splash.append(bg_sprite)
inner_bitmap = displayio.Bitmap(
display.width, display.height - BORDER * 2, 1
)
inner_palette = displayio.Palette(1)
inner_palette[0] = FOREGROUND_COLOR
inner_sprite = displayio.TileGrid(
inner_bitmap, pixel_shader=inner_palette, x=0, y=BORDER
)
splash.append(inner_sprite)
text = "Hello EEPW & DigiKey"
text_area = label.Label(terminalio.FONT, text=text, color=TEXT_COLOR)
text_width = text_area.bounding_box[2] * FONTSCALE
text_group = displayio.Group(
scale=FONTSCALE, x=display.width // 2 - text_width // 2, y=display.height // 2
)
text_group.append(text_area)
splash.append(text_group)
def showEEPWHdl(old_key_value : int):
key_value = old_key_value
showHelloEEPW()
while True:
key_value=isKeyPressed()
if old_key_value != key_value:
old_key_value = key_value
if key_value == KEY_D0:
break
def showFunctionMenu(index: int):
display = board.DISPLAY
splash = displayio.Group()
display.root_group = splash
text_line0 = "Hello EEPW & DigiKey"
if index == 0:
text_line0_area = label.Label(terminalio.FONT, text=text_line0, background_color=TEXT_COLOR_WHITE, color=TEXT_COLOR)
else:
text_line0_area = label.Label(terminalio.FONT, text=text_line0, color=TEXT_COLOR)
text_line0_group = displayio.Group(
scale=FONTSCALE, x=0, y=20
)
text_line0_group.append(text_line0_area)
splash.append(text_line0_group)
text_line1 = "Lux Control"
if index == 1:
text_line1_area = label.Label(terminalio.FONT, text=text_line1, background_color=TEXT_COLOR_WHITE, color=TEXT_COLOR)
else:
text_line1_area = label.Label(terminalio.FONT, text=text_line1, color=TEXT_COLOR)
text_line1_group = displayio.Group(
scale=FONTSCALE, x=0, y=60
)
text_line1_group.append(text_line1_area)
splash.append(text_line1_group)
text_line2 = "ISO"
if index == 2:
text_line2_area = label.Label(terminalio.FONT, text=text_line2, background_color=TEXT_COLOR_WHITE, color=TEXT_COLOR)
else:
text_line2_area = label.Label(terminalio.FONT, text=text_line2, color=TEXT_COLOR)
text_line2_group = displayio.Group(
scale=FONTSCALE, x=0, y=100
)
text_line2_group.append(text_line2_area)
splash.append(text_line2_group)
# Main function
key_value = 0
old_key_value = key_value
i = 0
keyInit()
showFunctionMenu(i)
while True:
key_value=isKeyPressed()
if old_key_value != key_value:
old_key_value = key_value
if key_value == KEY_D0:
if i == 0:
showEEPWHdl(key_value)
elif i == 1:
luxHdl(key_value)
elif i == 2:
cameraInfoHdl(key_value)
elif key_value == KEY_D1:
if i == 0:
i = 2
else:
i -= 1
elif key_value == KEY_D2:
if i == 2:
i = 0
else:
i += 1
showFunctionMenu(i)
成果视频:【Let's do 第3期—DIY电子测光表-哔哩哔哩】 https://b23.tv/xzSLaHJ
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