这个图里的1,2,3,4就是公共端,也就是分别管着对应的第1-4位接低电势或者接高电势(取决于你买了共阴还是共阳),剩下的a~h就是8个led小管子。
举个形象的例子,比如让第一个位数的b小灯泡亮,可以这么干:
接下来废话少说 上代码,有大妈亲测的0~9二进制表达:
# 4位共阴管
"""
tubeA -> GPIO0(Pin27)
tubeB -> GPIO6(Pin31)
tubeC -> GPIO7(Pin26)
tubeD -> GPIO20(Pin38)
tubeE -> GPIO21(Pin40)
tubeF -> GPIO5(Pin29)
tubeG -> GPIO1(Pin28)
tubeH -> GPIO16(Pin36) #小数点位
G1 -> GPIO22(Pin15)
G2 -> GPIO26(Pin37)
G3 -> GPIO17(Pin11)
G4 -> GPIO14(Pin8)
"""
import RPi.GPIO as GPIO
import random
import time
NUMBER_OF_DIGITS = 4
def format_num(num):
digits_left = NUMBER_OF_DIGITS
format_str = ''
if num < 0:
digits_left -= 1
format_str += '-'
num *= -1
if isinstance(num, int):
len_int = len(str(num))
else:
len_int = len(str(int(round(num))))
if len_int > digits_left:
return ''
else:
if isinstance(num, int):
format_str += '%d'
else:
len_frac = digits_left - len_int
format_str += '%%.%df' % len_frac
return format_str % num
GPIO.setmode(GPIO.BCM) #用BCM就是用GPIO序号,用BOARD就是用树莓派物理上的pin位置。
# GPIO ports for the 7seg pins
segments = (0,6,7,20,21,5,1,16)
for segment in segments:
GPIO.setup(segment, GPIO.OUT)
GPIO.output(segment, 1)
# GPIO ports for the digit 0-3 pins
digits = (22,26,17,14)
for digit in digits:
GPIO.setup(digit, GPIO.OUT)
GPIO.output(digit, 1)
#大妈顶着老花近视眼,笨办法个个数字调试出来的。前提第一个' '一定要对。
num = {
' ':(0,0,0,0,0,0,0),
'-':(0,0,1,0,0,0,0),
'6':(0,1,1,1,1,1,1),
'1':(0,0,0,0,1,1,0),
'8':(1,1,1,1,1,1,1),
'5':(0,1,1,1,0,1,1),
'0':(1,1,0,1,1,1,1),
'9':(1,1,1,1,0,1,1),
'4':(1,0,1,0,0,1,1),
'2':(1,1,1,1,1,0,0),
'3':(1,1,1,1,0,0,1),
'7':(1,1,0,0,0,1,1)
}
RAND_MAX = (10 ** NUMBER_OF_DIGITS) - 1
RAND_MIN = (-10 ** (NUMBER_OF_DIGITS - 1)) + 1
r = random.uniform(-1, 1)
max_scale = NUMBER_OF_DIGITS
if r < 0:
max_scale -= 1
n = r * (10 ** random.randint(0, max_scale))
print(n)
next_mode = 'int'
last_change = time.time()
try:
while True:
s = format_num(n).rjust(NUMBER_OF_DIGITS)
#s = format_num(4).rjust(NUMBER_OF_DIGITS) #猜单个数字的byte的时候用的。
digit = 0
for char in s:
if char == '.':
continue
for loop in range(0,7):
GPIO.output(segments[loop], num[char][loop])
if digit < (NUMBER_OF_DIGITS-1) and s[digit+1] == '.':
GPIO.output(16, 1)
else:
GPIO.output(16, 0)
GPIO.output(digits[digit], 0)
time.sleep(0.001)
GPIO.output(digits[digit], 1)
digit += 1
if (time.time() - last_change) > 2:
r = random.uniform(-1, 1)
max_scale = NUMBER_OF_DIGITS
if r < 0:
max_scale -= 1
n = r * (10 ** random.randint(0, max_scale))
if next_mode == 'int':
n = int(n)
next_mode = 'float'
elif next_mode == 'float':
next_mode = 'int'
print(n)
last_change = time.time()
finally:
GPIO.cleanup()