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