4 bit 7 segment display

 

import sys, os

import RPi.GPIO as GPIO

import time

import random

#fpid = os.fork()

#if fpid!=0:

to_display = '12,25'

GPIO.setmode (GPIO.BCM)

GPIO.setwarnings(False)

display_list = [17,27,22,10,9,11,6] #

# display list ref: A, B, C, D, E, F, G

for pin in display_list:

GPIO.setup(pin,GPIO.OUT) # set pins for each segement

# digits 1, 2, 3,4

set_digit = [26,8,19,7] #23=29

for digit in set_digit:

GPIO.setup(digit,GPIO.OUT) # set pins for digit selector

digit_dot = 16

# dot GPIO port

GPIO.setup(digit_dot, GPIO.OUT)

GPIO.setwarnings(True)

# A, B, C, D,E,F,G

arrSeg = [[0,0,0,0,0,0,1],\

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

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

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

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

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

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

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

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

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

def split_num(to_display): # splits the given number string

""" Splits variable 'to_display' string to a list of elements,

so that each element is a simple str number or space, and set strains to number

of digits given

"""

arrToDisplay = list(to_display)

if "," in arrToDisplay:

arrToDisplay[arrToDisplay.index(',')] = '.'

# index "," inlist and replace with "."

if len(arrToDisplay) > 5:

raise ValueError('Given Number is out of the range of display!')

# raise error if given number is more that for digits

return arrToDisplay

def show_display(num): # num represents any number that splitTodisplay cleans up

""" this function basically activates digits and the corresponding display

segements according to the variable(num), and removes '.' from the variable

if it finds one

"""

# handling floating numbers

if len(num) > 4:

for i in range(0,4):

new_num = [x for x in num if x!='.'] # if '.' in num, replaces '.' with ''

sel_digit = [[1, 0, 0, 0],\

[0, 1, 0, 0],\

[0, 0, 1, 0],\

[0, 0, 0, 1]]

GPIO.output(set_digit,sel_digit[i])

GPIO.output(display_list,arrSeg[int(new_num[i])])

# activate decimal digit

if num[i+1] == '.':

GPIO.output(digit_dot,0)

else:

GPIO.output(digit_dot,1)

time.sleep(.0001)

# integer number

else:

for i in range(0,4):

sel_digit = [[1, 0, 0, 0],\

[0, 1, 0, 0],\

[0, 0, 1, 0],\

[0, 0, 0, 1]]

GPIO.output(set_digit,sel_digit[i])

GPIO.output(display_list,arrSeg[int(num[i])])

time.sleep(.0001)

try:

time_end = time.time()+2 # time.time() time elapsed since 1970 in seconds

# while loop runs only two minutes , not a infinite loop

while time.time()<time_end: # while loop runs for 2 seconds

show_display(split_num(to_disp

lay))

except KeyboardInterrupt:

print('interrupted!')

finally:

GPIO.cleanup()

sys.exit()