树莓派平台4位共阴数码管Python编程

    初学Python，试着将以前在树莓派上用C语言写的程序改成了Python版本的。四位共阴数码管与树莓派的电路连接方式如下：

            a ~ p ------------------------------   GPIO0  ~  GPIO7

       d1 ~ d4-----------------------------   GPIO11 ~ GPIO8

下面是电路连接好之后的照片：

连接好电路之后写程序，程序代码如下：

#!/usr/bin/env python

import RPi.GPIO as GPIO
import time

BIT0 = 3 
BIT1 = 5
BIT2 = 24
BIT3 = 26
 
segCode = [0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f]  #0~9
pins = [11,12,13,15,16,18,22,7,3,5,24,26]
bits = [BIT0, BIT1, BIT2, BIT3]

def print_msg():
	print 'Program is running...'
	print 'Please press Ctrl+C end the program...'

def digitalWriteByte(val):
	GPIO.output(11, val & (0x01 << 0))
	GPIO.output(12, val & (0x01 << 1))
	GPIO.output(13, val & (0x01 << 2))
	GPIO.output(15, val & (0x01 << 3))
	GPIO.output(16, val & (0x01 << 4))
	GPIO.output(18, val & (0x01 << 5))
	GPIO.output(22, val & (0x01 << 6))
	GPIO.output(7,  val & (0x01 << 7))

def display_1():
	GPIO.output(BIT0, GPIO.LOW) 
	for	i in range(10):
		digitalWriteByte(segCode[i])
		time.sleep(0.5)

def display_2():
	for bit in bits:
		GPIO.output(bit, GPIO.LOW) 
	for	i in range(10):
		digitalWriteByte(segCode[i])
		time.sleep(0.5)

def display_3(num):
	b0 = num % 10
	b1 = num % 100 / 10 
	b2 = num % 1000 / 100
	b3 = num / 1000
	if num < 10:
		GPIO.output(BIT0, GPIO.LOW) 
		GPIO.output(BIT1, GPIO.HIGH) 
		GPIO.output(BIT2, GPIO.HIGH) 
		GPIO.output(BIT3, GPIO.HIGH) 
		digitalWriteByte(segCode[b0])
	elif num >= 10 and num < 100:
		GPIO.output(BIT0, GPIO.LOW)
		digitalWriteByte(segCode[b0])
		time.sleep(0.002)
		GPIO.output(BIT0, GPIO.HIGH) 
		GPIO.output(BIT1, GPIO.LOW)
		digitalWriteByte(segCode[b1])
		time.sleep(0.002)
		GPIO.output(BIT1, GPIO.HIGH)
	elif num >= 100 and num < 1000:
		GPIO.output(BIT0, GPIO.LOW)
		digitalWriteByte(segCode[b0])
		time.sleep(0.002)
		GPIO.output(BIT0, GPIO.HIGH) 
		GPIO.output(BIT1, GPIO.LOW)
		digitalWriteByte(segCode[b1])
		time.sleep(0.002)
		GPIO.output(BIT1, GPIO.HIGH)
		GPIO.output(BIT2, GPIO.LOW)
		digitalWriteByte(segCode[b2])
		time.sleep(0.002)
		GPIO.output(BIT2, GPIO.HIGH) 
	elif num >= 1000 and num < 10000:
		GPIO.output(BIT0, GPIO.LOW)
		digitalWriteByte(segCode[b0])
		time.sleep(0.002)
		GPIO.output(BIT0, GPIO.HIGH) 
		GPIO.output(BIT1, GPIO.LOW)
		digitalWriteByte(segCode[b1])
		time.sleep(0.002)
		GPIO.output(BIT1, GPIO.HIGH)
		GPIO.output(BIT2, GPIO.LOW)
		digitalWriteByte(segCode[b2])
		time.sleep(0.002)
		GPIO.output(BIT2, GPIO.HIGH) 
		GPIO.output(BIT3, GPIO.LOW)
		digitalWriteByte(segCode[b3])
		time.sleep(0.002)
		GPIO.output(BIT3, GPIO.HIGH) 
	else:
		print 'Out of range, num should be 0~9999 !'

def setup():
	GPIO.setmode(GPIO.BOARD)    #Number GPIOs by its physical location
	for pin in pins:
		GPIO.setup(pin, GPIO.OUT)    #set all pins' mode is output
		GPIO.output(pin, GPIO.HIGH)  #set all pins are high level(3.3V)

def loop():
	while True:
		print_msg()
		display_1()
		time.sleep(1)
		display_2()
		time.sleep(1)

		tmp = int(raw_input('Please input a num(0~9999):'))
		for i in range(500):
			display_3(tmp)
		time.sleep(1)

def destroy():   #When program ending, the function is executed. 
	for pin in pins:  
		GPIO.output(pin, GPIO.LOW) #set all pins are low level(0V) 
		GPIO.setup(pin, GPIO.IN)   #set all pins' mode is input
	 
if __name__ == '__main__': #Program starting from here 
	setup() 
	try:
		loop()  
	except KeyboardInterrupt:  
		destroy()  

演示视频下载链接： http://yunpan.cn/cASWDrmujvBxE   提取码 68e4