scrollbot-website-monitor.py

#!/usr/bin/env python

# https://forums.pimoroni.com/t/keeping-an-eye-on-a-website-with-rpi0-and-scroll-phat-hd/4487

import os
import time
import signal
import math
import scrollphathd
from scrollphathd.fonts import font3x5

def warning():
        speed_factor = 10
        scale = (math.sin(time.time() * speed_factor) + 1) / 2
        offset = 0
        for x in range(scrollphathd.width):
            for y in range(scrollphathd.height):
                offset += 1
                color = 0.85 * scale * (offset % 2)
                scrollphathd.pixel(x, y, color)
        scrollphathd.show()

def clock():
        scrollphathd.rotate(180)
        scrollphathd.clear()
        str1 = time.strftime("%H%M")
        scrollphathd.write_string(str1, x=1, y=1, font=font3x5, brightness=0.01)
        scrollphathd.show()
        time.sleep(0.1)

while True:
        web = os.popen("curl -s https://example.com | grep .css").read()
        t_end = time.time() + 60 * 1
        if "hot.css" in web:
                while time.time() < t_end:
                        warning()
        else:
                while time.time() < t_end:
                        clock()

# After this I created a cron job to make sure that the script above is running and to restart it if it is not working. Since the only python program running in this rpi0 is the above clock script, the restart script simply looks if any python program is running and if there is none, restarts the clock script. Here is /home/pi/restart.sh I created:

#!/bin/bash

#if [ "$(pidof python)" ]
#then
  #exit
#else
  #nohup /home/pi/clock.py &>/dev/null &
#fi

# crontab -e

# and add the line:

# * * * * * /home/pi/restart.sh