countdown.py

import time
import lcd
import math
import RPi.GPIO as GPIO

class CountdownTimer:

    def __init__(self):
        self.epoch = 1560247200 # epoch time of event
        self.text = "Countdown to ORL" # message on the top line
        
         """ Setting up the LCD Display """
        LINE_1 = lcd.LCD_LINE_1
        LINE_2 = lcd.LCD_LINE_2
        
    """ Sets the epoch time to countdown to """
    def setEpoch(self, t):
        global epoch
        epoch = t

        if epoch < time.time():
            lcd.lcd_string("TIME IN PAST", lcd.LCD_LINE_1)
            GPIO.cleanup()
            raise Exception("Current epoch is greater than time given")

    """ Sets the top line text """
    def setText(self, message):
        global text
        text = message

        if(len(text) > 16):
                text = "Text must be < 16"

    def main(self):
        lcd.lcd_init()
        lcd.lcd_string("###SETTING UP###", LINE_1)
        lcd.lcd_string("###SETTING UP###", LINE_2)

        lcd.lcd_string(text, LINE_1)

        while(True):

            time.sleep(.05); # this is to give the pi a cool down

            temp_time = epoch - time.time()

            """ Calculating the number of days until the specified time """
            days = int(math.floor((epoch - time.time()) / 86400))
            temp_time -= days * 86400 # updating the temp time

            """ Calculating the number of hours until the specified time """
            hours = int(math.floor(temp_time / 3600))
            temp_time -= hours * 3600 # updating temp_time

            """ Calculating the number of minutes until the specified time """
            minutes = int(math.floor(temp_time / 60))
            seconds = int(temp_time - minutes * 60)

            lcd.lcd_string("  %02d:%02d:%02d:%02d" % (days,hours,minutes,seconds), LINE_2)


if __name__ == '__main__':
    try:
        CountdownTime.main()
    except KeyboardInterrupt:
        lcd.lcd_string("   ERROR KBI", LINE_1)
        GPIO.cleanup() # cleaning up GPIO pins