lcd_countdown.py

#!/usr/bin/python
import datetime
import lcddriver
import time
import sys
import getopt
from datetime import timedelta


# Load the driver and set it to "display"
display = lcddriver.lcd()

def show_message_blink(display, text , row_num , max_cols):
    display.lcd_display_string(text,row_num)
    time.sleep(0.4)
    padding = ' ' * max_cols
    display.lcd_display_string(padding,row_num)
    time.sleep(0.4)
    
def show_usage():
    print ("Usage: " + sys.argv[0] + ' -f <first row message> -b <blink first row> -c <center first row> -C <center second row> -d <date DD:MM:YYYY hh:mm:ss>')
    display.lcd_clear()
    display.lcd_backlight(0) 
    sys.exit()

def show_message_one_row(display, text, row_num , max_cols, center, blink):
    if(len(text) > max_cols):
        time.sleep(1)
        #To allow show two special functions as blink and scoll at the same time this must be converted to multi thread execution
        blink = 0;
        padding = ' ' * max_cols
        txt2show = padding + text + padding
        for i in range(len(txt2show) - max_cols + 1):
            text_to_print = txt2show[i:i+max_cols]
            display.lcd_display_string(text_to_print,row_num)
            time.sleep(0.2)
        time.sleep(0.7)
    else:
        txt2show = text
        if ((center == 1) and (len(text) < max_cols)):
            padding = ' ' * int(round((max_cols - len(text))/2))
            txt2show = padding + text + padding
        if (blink == 1):    
            show_message_blink(display, txt2show , row_num , max_cols)
        else :   
            display.lcd_display_string(txt2show,row_num)



def main(argv):
    row1_msg = ''
    date = ''
    blink1 = 0
    center1 = 0
    display_cols = 15
    row_num = 1
    text = ""

    date = '31-12-2020 23:59:59'
    targetTime = datetime.datetime.strptime(date, '%d-%m-%Y %H:%M:%S')
    timeNow = datetime.datetime.now()

    try:
        opts, args = getopt.getopt(argv,"hf:d:bc",["msg1=","msg2=","date=","blink1","center1"])
    except getopt.GetoptError:
        show_usage()

    for opt, arg in opts:
        if opt == '-h':
         show_usage()
        elif opt in ("-f", "--msg1"):
            row1_msg = arg
        elif opt in ("-d", "--date"):
            date = int(arg)      
        elif opt in ("-b", "--blink1"):
            blink1 = 1            
        elif opt in ("-c", "--center1"):
            center1 = 1    

    try:
        while timeNow <= targetTime:
            timeNow = datetime.datetime.now() # the time now
            remainingTime = (targetTime-timeNow)
            days = remainingTime.days
            secs = remainingTime.seconds
            hrs, secs = divmod(secs, 3600)
            mins, secs = divmod(secs, 60)     
            remain_time_str = str(days) + " " + str(hrs) + " " + str(mins)+ " " + str(secs)
            show_message_one_row(display, row1_msg, 1, display_cols, center1, blink1)     
            show_message_one_row(display, remain_time_str, 2, display_cols, 1, 0)   
            time.sleep(1)            
        # Clear and Turn backlight off
        display.lcd_clear()
        display.lcd_backlight(0)                          
    except KeyboardInterrupt: # If there is a KeyboardInterrupt (when you press CTRL + C), exit the program and cleanup
        display.lcd_clear()
        display.lcd_backlight(0)

if __name__ == "__main__":
   main(sys.argv[1:])