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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.
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.
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.
|
