Display refresh time of a thingspeak feed on a Rpi sense hat 8x8 LED matrix

led_panel.py

#!/usr/bin/env python3

import http.client
from sense_hat import SenseHat
import dateutil.parser
import datetime
import schedule
import time
import threading
import json

# some const
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)
WHITE = (255, 255, 255)
ZERO = datetime.timedelta(0)

class UTC(datetime.tzinfo):
    def utcoffset(self, dt):
        return ZERO

    def tzname(self, dt):
        return "UTC"

    def dst(self, dt):
        return ZERO

def job_check():
    global is_ok, sec
    connection = http.client.HTTPSConnection('api.thingspeak.com', timeout=5.0)
    headers = {'Content-type': 'application/json'}
    try:
        connection.request('GET', '/channels/181289/feeds/last.json', headers=headers)
        response = connection.getresponse().read().decode()
        if response != '-1':
            d = json.loads(response) 
            now = datetime.datetime.now(utc)
            update = dateutil.parser.parse(d['created_at'])
            delta = abs(now - update)
            sec = int(delta.total_seconds())
            is_ok = (sec < 5*60)
    except (socket.error, HTTPException):
        print('HTTP error')
    except:
        print('Misc error')

def th_display():
    #init
    sense = SenseHat()
    sense.rotation = 0
    sense.low_light=True
    sense.clear()
    # loop
    while True:
        if is_ok:
            sense.show_message('OK %ss' % str(sec), text_colour=GREEN)
        else:
            sense.show_message('ERR %ss' % str(sec), text_colour=RED)
    time.sleep(.5)

# init
utc = UTC()
is_ok = True
sec = 0
threading.Thread(target=th_display, daemon=True).start()
schedule.every(15).seconds.do(job_check)

# loop
while True:
    schedule.run_pending()
    time.sleep(0.1)