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----
-title: Simple world clock with eInk display and Raspberry Pi Zero
-url: simple-world-clock-with-eiink-display-and-raspberry-pi-zero.html
-date: 2021-06-26T12:00:00+02:00
-draft: false
----
-
-Our team is spread across the world, from the USA all the way to Australia, so
-having some sort of world clock makes sense.
-
-Currently, I am using an extension for Gnome called [Timezone
-extension](https://extensions.gnome.org/extension/2657/timezones-extension/),
-and it serves the purpose quite well.
-
-But I also have a bunch of electronics that I bought through the time, and I am
-not using any of them, and it's time to stop hording this stuff and use it in a
-project.
-
-A while ago I bought a small eInk display [Inky
-pHAT](https://shop.pimoroni.com/products/inky-phat?variant=12549254217811) and I
-have a bunch of [Raspberry Pi's
-Zero](https://www.raspberrypi.org/products/raspberry-pi-zero/) lying around that
-I really need to use.
-
-![Inky pHAT, Raspberry Pi Zero](/assets/world-clock/hardware.jpg)
-
-Since the Inky [Inky
-pHAT](https://shop.pimoroni.com/products/inky-phat?variant=12549254217811) is
-essentially a HAT, it can easily be added on top of the [Raspberry Pi
-Zero](https://www.raspberrypi.org/products/raspberry-pi-zero/).
-
-First, I installed the necessary software on Raspberry Pi with `pip3 install
-inky`.
-
-And then I created a file `clock.py` in home directory `/home/pi`.
-
-```python
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-import sys
-import os
-from inky.auto import auto
-from PIL import Image, ImageFont, ImageDraw
-from font_fredoka_one import FredokaOne
-
-clocks = [
-  'America/New_York',
-  'Europe/Ljubljana',
-  'Australia/Brisbane',
-]
-
-board = auto()
-board.set_border(board.WHITE)
-board.rotation = 90
-
-img = Image.new('P', (board.WIDTH, board.HEIGHT))
-draw = ImageDraw.Draw(img)
-
-big_font = ImageFont.truetype(FredokaOne, 18)
-small_font = ImageFont.truetype(FredokaOne, 13)
-
-x = board.WIDTH / 3
-y = board.HEIGHT / 3
-
-idx = 1
-for clock in clocks:
-  ctime = os.popen('TZ="{}" date +"%a,%H:%M"'.format(clock))
-  ctime = ctime.read().strip().split(',')
-  city = clock.split('/')[1].replace('_', ' ')
-
-  draw.text((15, (idx*y)-y+10), city, fill=board.BLACK, font=small_font)
-  draw.text((110, (idx*y)-y+7), str(ctime[0]), fill=board.BLACK, font=big_font)
-  draw.text((155, (idx*y)-y+7), str(ctime[1]), fill=board.BLACK, font=big_font)
-
-  idx += 1
-
-board.set_image(img)
-board.show()
-```
-
-And because eInk displays are rather slow to refresh and the clock requires
-refreshing only once a minute, this can be done through cronjob.
-
-Before we add this job to cron we need to make `clock.py` executable with `chmod
-+x clock.py`.
-
-Then we add a cronjob with `crontab -e`.
-
-```
-* * * * * /home/pi/clock.py
-```
-
-So, we end up with a result like this.
-
-![World Clock](/assets/world-clock/world-clock.jpg)
-
-And for the enclosure that can be 3D printed, but I haven't yet something like
-this can be used.
-
-<iframe id="vs_iframe" src="https://www.viewstl.com/?embedded&url=https%3A%2F%2Fmitjafelicijan.com%2Fassets%2Fworld-clock%2Fenclosure.stl&color=gray&bgcolor=white&edges=no&orientation=front&noborder=no" style="border:0;margin:0;width:100%;height:400px;"></iframe>
-
-You can download my [STL file for the enclosure
-here](/assets/world-clock/enclosure.stl), but make sure that dimensions make
-sense and also opening for USB port should be added or just use a drill and some
-hot glue to make it stick in the enclosure.
-