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树莓派点亮数码管
简介树莓派点亮多个数码管，实现计数器效果B 站链接 https://www.bilibili.com/video/BV1Wy4y1s7mv/
一、认识数码管
二、接线
4位共阳极数码管共12个引脚，其中8个对应一个数码管中的a~f段，其余4个分别控制着4个位19
三、点亮单个数码管
class MyGPIO():
init_count = 0
mode = GPIO.BCM
def __init__(self, idx, init_with_high):
if MyGPIO.init_count == 0:
GPIO.setmode(MyGPIO.mode)
MyGPIO.init_count += 1
self.idx = idx
initial = GPIO.HIGH if init_with_high else GPIO.LOW
GPIO.setup(self.idx, GPIO.OUT, initial=initial)
def __del__(self):
MyGPIO.init_count -= 1
if MyGPIO.init_count == 0:
GPIO.cleanup()
def high(self):
GPIO.output(self.idx, GPIO.HIGH)
def low(self):
GPIO.output(self.idx, GPIO.LOW)
class Digital():
seg_idx = {'a': 4, 'b': 27, 'c': 26, 'd': 13, 'e': 6, 'f': 17, 'g': 22, 'dp': 19}
def __init__(self, negative_idx):
self.postive = MyGPIO(negative_idx, init_with_high=True)
self.seg_a = MyGPIO(Digital.seg_idx['a'], init_with_high=True)
self.seg_b = MyGPIO(Digital.seg_idx['b'], init_with_high=True)
self.seg_c = MyGPIO(Digital.seg_idx['c'], init_with_high=True)
self.seg_d = MyGPIO(Digital.seg_idx['d'], init_with_high=True)
self.seg_e = MyGPIO(Digital.seg_idx['e'], init_with_high=True)
self.seg_f = MyGPIO(Digital.seg_idx['f'], init_with_high=True)
self.seg_g = MyGPIO(Digital.seg_idx['g'], init_with_high=True)
self.seg_dp = MyGPIO(Digital.seg_idx['dp'], init_with_high=True)
self.all_segs = {
'a': self.seg_a, 'b': self.seg_b, 'c': self.seg_c, 'd': self.seg_d,
'e': self.seg_e, 'f': self.seg_f, 'g': self.seg_g, 'dp': self.seg_dp
}
def off(self): # 对于关闭，只需将正极拉低即可
self.postive.low()
def show_segs(self, segs=list()): # 显示一个数字时，先将所有seg清空，再显示具体的
for seg in self.all_segs:
self.all_segs[seg].high()
self.postive.high() # 正极拉高
for seg in segs:
self.all_segs[seg].low() # 负极拉低
def show(self, num):
segs = []
if num == 0:
segs = ['a', 'b', 'c', 'd', 'e', 'f']
elif num == 1:
segs = ['b', 'c']
elif num == 2:
segs = ['a', 'b', 'g', 'e', 'd']
elif num == 3:
segs = ['a', 'b', 'g', 'c', 'd']
elif num == 4:
segs = ['f', 'g', 'b', 'c']
elif num == 5:
segs = ['a', 'f', 'g', 'c', 'd']
elif num == 6:
segs = ['a', 'f', 'e', 'd', 'c', 'g']
elif num == 7:
segs = ['a', 'b', 'c']
elif num == 8:
segs = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
elif num == 9:
segs = ['a', 'b', 'c', 'd', 'f', 'g']
self.show_segs(segs)
d1 = Digital(12)
d2 = Digital(16)
d3 = Digital(20)
d4 = Digital(21)
for i in range(10):
d1.show(i)
time.sleep(1)
四、点亮多个数码管
class MultiDigital():
def __init__(self, idx1, idx2, idx3, idx4):
self.d1 = Digital(idx1)
self.d2 = Digital(idx2)
self.d3 = Digital(idx3)
self.d4 = Digital(idx4)
def show_a(self, num):
self.d2.off()
self.d3.off()
self.d4.off()
self.d1.show(num)
def show_b(self, num):
self.d1.off()
self.d3.off()
self.d4.off()
self.d2.show(num)
def show_c(self, num):
self.d1.off()
self.d2.off()
self.d4.off()
self.d3.show(num)
def show_d(self, num):
self.d1.off()
self.d2.off()
self.d3.off()
self.d4.show(num)
def show_num(self, num, show_time):
num %= 10000
n1 = int(num / 1000)
n2 = int(num % 1000 / 100)
n3 = int(num % 100 / 10)
n4 = int(num % 10)
sleep_seconds = 0.005
while show_time > 0:
self.show_a(n1)
time.sleep(sleep_seconds)
self.show_b(n2)
time.sleep(sleep_seconds)
self.show_c(n3)
time.sleep(sleep_seconds)
self.show_d(n4)
time.sleep(sleep_seconds)
show_time -= sleep_seconds * 4
五、计数器
class DigitalCount():
def __init__(self):
self.digitials = MultiDigital(12, 16, 20, 21)
def run(self):
last_time = time.time()
count = 0
while True:
time_now = time.time()
self.digitials.show_num(count, time_now + 0.05 - last_time)
count += 1
last_time = time.time()
