为更新而更新，为保持更新状态而更新。

给学生讲解用gpiozero库控制八段管和8x8共阳极LED点阵。已经讲解了单个LED的控制，RGB彩色灯珠的控制，在讲解八段管就很容易理解，多个八段管的讲解稍微麻烦一点，然后LED点阵为了便于理解，绘制了演示程序，可以演示行扫描图案变化过程，以及设置阳极高低引脚图案的变化。8短数码管的很简单，LED点阵的略复杂。

模拟共阴极八段数码管

image.png

from turtle import *

speed(0)

sega = Turtle()

sega.pu()

sega.goto(0, 300)

w = 150

h = 20

def rect(t,flag=True, fill=False):

for i in range(2):

if fill:

t.begin_fill()

if flag:

t.fd(w)

t.rt(90)

t.fd(h)

t.rt(90)

else:

t.fd(h)

t.rt(90)

t.fd(w)

t.rt(90)

if fill:

t.end_fill()

sega.pd()

rect(sega)

segg = Turtle()

segg.pu()

segg.goto(0, 120)

segg.pd()

rect(segg)

segd = Turtle()

segd.pu()

segd.goto(0, -65)

segd.pd()

rect(segd)

segb = Turtle()

segb.pu()

segb.goto(130, 275)

segb.pd()

rect(segb, False)

segc = Turtle()

segc.pu()

segc.goto(130, 90)

segc.pd()

rect(segc, False)

sege = Turtle()

sege.pu()

sege.goto(0, 90)

sege.pd()

rect(sege, False)

segf = Turtle()

segf.pu()

segf.goto(0, 275)

segf.pd()

rect(segf, False)

segh = Turtle()

segh.pu()

segh.goto(180, 30)

segh.pd()

rect(segh, False)

zero = [1, 1, 1, 1, 1, 1, 0, 0]

one = [0, 1, 1, 0, 0, 0, 0, 0]

two = [1, 1, 0, 1, 1, 0, 1, 0]

three = [1, 1, 1, 1, 0, 0, 1, 0]

four = [0, 1, 1, 0, 0, 1, 1, 0]

five = [1, 0, 1, 1, 0, 1, 1, 0]

segs = [sega, segb, segc, segd, sege, segf, segg, segh]

dirt = [True, False, False, True, False, False, True, False]

for seg in segs:

seg.speed(0)

for i in range(8):

if five[i] == 1:

rect(segs[i], flag=dirt[i], fill=True)

else:

rect(segs[i], flag=dirt[i], fill=False)

image.png

模拟共阳极8x8led点阵

image.png

from turtle import *

tracer(40, 2)

class LED():

def __init__(self, x, y, r=15):

self.r = r

self.neg = 0

self.pos = 0

self.t = Turtle()

self.t.pu()

self.t.goto(x, y)

self.t.speed(0)

self.t.ht()

self.setNeg(self.neg)

self.display()

def setNeg(self, value):

self.neg = value

self.display()

def display(self):

if self.neg == 1:

self.t.color((0.4, 0.4, 0.4), (1, 0, 0))

else:

self.t.color((0.4, 0.4, 0.4), 'white')

self.t.begin_fill()

self.t.pd()

self.t.circle(self.r)

self.t.pu()

self.t.end_fill()

offx = -200

offy = 200

leds = []

gap = 50

color((0.4, 0.4, 0.4))

pu()

goto(offx - gap/2, offy + 3*gap/4)

pd()

begin_fill()

for i in range(4):

fd(8 * gap)

rt(90)

end_fill()

##for row in range(8):

## led_row = []

## for col in range(8):

## led = LED(offx + gap * col, offy - gap * row)

## # led.display()

## led_row.append(LED(offx + 20 * col, offy - 20 * row))

## leds.append(led_row)

for j in range(8):

row = []

for i in range(8):

led = LED(offx + gap * i, offy - gap * j)

row.append(led)

leds.append(row)

from time import sleep

heart =[

[0, 0, 0, 0, 0, 0, 0, 0],

[0, 1, 1, 0, 0, 1, 1, 0],

[1, 1, 1, 1, 1, 1, 1, 1],

[1, 1, 1, 1, 1, 1, 1, 1],

[0, 1, 1, 1, 1, 1, 1, 0],

[0, 0, 1, 1, 1, 1, 0, 0],

[0, 0, 0, 1, 1, 0, 0, 0],

[0, 0, 0, 0, 0, 0, 0, 0],

]

heart_sm =[

[0, 0, 0, 0, 0, 0, 0, 0],

[0, 0, 0, 0, 0, 0, 0, 0],

[0, 1, 1, 0, 0, 1, 1, 0],

[1, 1, 1, 1, 1, 1, 1, 1],

[1, 1, 1, 1, 1, 1, 1, 1],

[0, 1, 1, 1, 1, 1, 1, 0],

[0, 0, 1, 1, 1, 1, 0, 0],

[0, 0, 0, 1, 1, 0, 0, 0],

]

while True:

for row in range(8):

for col in range(8):

leds[row][col].setNeg(heart[row][col])

leds[row][col].display()

for row in range(8):

for col in range(8):

leds[row][col].setNeg(heart_sm[row][col])

leds[row][col].display()

image.png

image.png

image.png