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authorMitja Felicijan <mitja.felicijan@gmail.com>2023-11-01 22:54:27 +0100
committerMitja Felicijan <mitja.felicijan@gmail.com>2023-11-01 22:54:27 +0100
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1<!doctype html><html lang=en-us><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=generator content="JBMAFP - github.com/mitjafelicijan/jbmafp"><link href="data:image/x-icon;base64,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" rel=icon type=image/x-icon><title>Simple world clock with eInk display and Raspberry Pi Zero</title><meta name=description content="Our team is spread across the world, from the USA all the way to Australia, sohaving some sort of world clock makes sense."><meta name=author content="Mitja Felicijan"><link rel=alternate type=application/rss+xml title="Mitja Felicijan's posts" href=https://mitjafelicijan.com/index.xml><link rel=alternate type=application/rss+xml title="Mitja Felicijan's notes" href=https://mitjafelicijan.com/notes.xml><style>:root{--border-color:gainsboro;--border-size:2px;--link-color:blue;--bg-color:#eee}*::selection{background:var(--link-color);color:#fff}*::-moz-selection{background:var(--link-color);color:#fff}*::-webkit-selection{background:var(--link-color);color:#fff}body{padding:2.5rem;max-width:1900px;background:#fff;font-family:sans-serif;line-height:1.35rem;font-size:16px}hr{border:0;border-bottom:var(--border-size)solid var(--border-color);margin-block-start:1.5rem}a{color:var(--link-color);text-decoration:none}h1,h2,h3{line-height:initial}h1{font-size:xx-large}footer{margin-block-start:2rem}cap{text-transform:capitalize}blockquote{font-style:italic}table{max-width:100%;border:var(--border-size)solid var(--border-color);border-collapse:separate;border-spacing:0}table thead tr th{border-bottom:var(--border-size)solid var(--border-color);text-align:left}table th,table td{padding:.5em .8em}ul.list li{padding:.2em 0}ul{line-height:1.35em}pre{text-wrap:nowrap;overflow-x:auto;padding:0 1em;border:var(--border-size)solid var(--border-color)}code{padding:0 3px;font-size:14px;border:0;background:var(--bg-color)}pre code{line-height:1.3em;background:#fff}pre,code,pre *,code *{font-family:monospace}figure{margin-inline-start:0;margin-inline-end:0}figcaption{width:800px;max-width:100%;text-align:center}figcaption p{margin:.3em 0 1.5em;font-style:italic}img,video,audio{width:800px;max-width:100%;border:var(--border-size)solid var(--border-color);padding:.5em}header nav{display:flex;gap:.9rem}article iframe{margin:0!important}audio::-webkit-media-controls-enclosure{border-radius:0}@media only screen and (max-width:600px){body{padding:.5em;word-wrap:break-word}header nav{gap:.7rem}header nav .hob{display:none}a{word-wrap:break-word}img,video,audio{padding:0}}</style><header><nav class=main itemscope itemtype=http://schema.org/SiteNavigationElement role=navigation aria-label="Main navigation"><a href=/>Home</a>
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9<a href=/index.xml target=_blank class=hob>RSS</a></nav></header><main role=main><article itemtype=http://schema.org/Article><h1 itemtype=headline>Simple world clock with eInk display and Raspberry Pi Zero</h1><p><cap>post</cap>, Jun 26, 2021 on <a href=https://mitjafelicijan.com>Mitja Felicijan's blog</a><div><p>Our team is spread across the world, from the USA all the way to Australia, so
10having some sort of world clock makes sense.<p>Currently, I am using an extension for Gnome called <a href=https://extensions.gnome.org/extension/2657/timezones-extension/>Timezone
11extension</a>,
12and it serves the purpose quite well.<p>But I also have a bunch of electronics that I bought through the time, and I am
13not using any of them, and it's time to stop hording this stuff and use it in a
14project.<p>A while ago I bought a small eInk display <a href="https://shop.pimoroni.com/products/inky-phat?variant=12549254217811">Inky
15pHAT</a> and I
16have a bunch of <a href=https://www.raspberrypi.org/products/raspberry-pi-zero/>Raspberry Pi's
17Zero</a> lying around that
18I really need to use.<figure><img src=/posts/world-clock/hardware.jpg alt="Inky pHAT, Raspberry Pi Zero"></figure><p>Since the Inky <a href="https://shop.pimoroni.com/products/inky-phat?variant=12549254217811">Inky
19pHAT</a> is
20essentially a HAT, it can easily be added on top of the <a href=https://www.raspberrypi.org/products/raspberry-pi-zero/>Raspberry Pi
21Zero</a>.<p>First, I installed the necessary software on Raspberry Pi with <code>pip3 install inky</code>.<p>And then I created a file <code>clock.py</code> in home directory <code>/home/pi</code>.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:green>#!/usr/bin/env python</span>
22</span></span><span style=display:flex><span><span style=color:green># -*- coding: utf-8 -*-</span>
23</span></span><span style=display:flex><span>
24</span></span><span style=display:flex><span><span style=color:#00f>import</span> sys
25</span></span><span style=display:flex><span><span style=color:#00f>import</span> os
26</span></span><span style=display:flex><span><span style=color:#00f>from</span> inky.auto <span style=color:#00f>import</span> auto
27</span></span><span style=display:flex><span><span style=color:#00f>from</span> PIL <span style=color:#00f>import</span> Image, ImageFont, ImageDraw
28</span></span><span style=display:flex><span><span style=color:#00f>from</span> font_fredoka_one <span style=color:#00f>import</span> FredokaOne
29</span></span><span style=display:flex><span>
30</span></span><span style=display:flex><span>clocks = [
31</span></span><span style=display:flex><span> <span style=color:#a31515>&#39;America/New_York&#39;</span>,
32</span></span><span style=display:flex><span> <span style=color:#a31515>&#39;Europe/Ljubljana&#39;</span>,
33</span></span><span style=display:flex><span> <span style=color:#a31515>&#39;Australia/Brisbane&#39;</span>,
34</span></span><span style=display:flex><span>]
35</span></span><span style=display:flex><span>
36</span></span><span style=display:flex><span>board = auto()
37</span></span><span style=display:flex><span>board.set_border(board.WHITE)
38</span></span><span style=display:flex><span>board.rotation = 90
39</span></span><span style=display:flex><span>
40</span></span><span style=display:flex><span>img = Image.new(<span style=color:#a31515>&#39;P&#39;</span>, (board.WIDTH, board.HEIGHT))
41</span></span><span style=display:flex><span>draw = ImageDraw.Draw(img)
42</span></span><span style=display:flex><span>
43</span></span><span style=display:flex><span>big_font = ImageFont.truetype(FredokaOne, 18)
44</span></span><span style=display:flex><span>small_font = ImageFont.truetype(FredokaOne, 13)
45</span></span><span style=display:flex><span>
46</span></span><span style=display:flex><span>x = board.WIDTH / 3
47</span></span><span style=display:flex><span>y = board.HEIGHT / 3
48</span></span><span style=display:flex><span>
49</span></span><span style=display:flex><span>idx = 1
50</span></span><span style=display:flex><span><span style=color:#00f>for</span> clock <span style=color:#00f>in</span> clocks:
51</span></span><span style=display:flex><span> ctime = os.popen(<span style=color:#a31515>&#39;TZ=&#34;</span><span style=color:#a31515>{}</span><span style=color:#a31515>&#34; date +&#34;</span><span style=color:#a31515>%a</span><span style=color:#a31515>,%H:%M&#34;&#39;</span>.format(clock))
52</span></span><span style=display:flex><span> ctime = ctime.read().strip().split(<span style=color:#a31515>&#39;,&#39;</span>)
53</span></span><span style=display:flex><span> city = clock.split(<span style=color:#a31515>&#39;/&#39;</span>)[1].replace(<span style=color:#a31515>&#39;_&#39;</span>, <span style=color:#a31515>&#39; &#39;</span>)
54</span></span><span style=display:flex><span>
55</span></span><span style=display:flex><span> draw.text((15, (idx*y)-y+10), city, fill=board.BLACK, font=small_font)
56</span></span><span style=display:flex><span> draw.text((110, (idx*y)-y+7), str(ctime[0]), fill=board.BLACK, font=big_font)
57</span></span><span style=display:flex><span> draw.text((155, (idx*y)-y+7), str(ctime[1]), fill=board.BLACK, font=big_font)
58</span></span><span style=display:flex><span>
59</span></span><span style=display:flex><span> idx += 1
60</span></span><span style=display:flex><span>
61</span></span><span style=display:flex><span>board.set_image(img)
62</span></span><span style=display:flex><span>board.show()
63</span></span></code></pre><p>And because eInk displays are rather slow to refresh and the clock requires
64refreshing only once a minute, this can be done through cronjob.<p>Before we add this job to cron we need to make <code>clock.py</code> executable with <code>chmod +x clock.py</code>.<p>Then we add a cronjob with <code>crontab -e</code>.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>* * * * * /home/pi/clock.py
65</span></span></code></pre><p>So, we end up with a result like this.<figure><img src=/posts/world-clock/world-clock.jpg alt="World Clock"></figure><p>And for the enclosure that can be 3D printed, but I haven't yet something like
66this can be used.</p><iframe id=vs_iframe src="https://www.viewstl.com/?embedded&url=https%3A%2F%2Fmitjafelicijan.com%2Fposts%2Fworld-clock%2Fenclosure.stl&color=gray&bgcolor=white&edges=no&orientation=front&noborder=no" style=border:0;margin:0;width:100%;height:400px></iframe><p>You can download my <a href=/posts/world-clock/enclosure.stl>STL file for the enclosure
67here</a>, but make sure that dimensions make
68sense and also opening for USB port should be added or just use a drill and some
69hot glue to make it stick in the enclosure.</div></article></main><section><hr><h2>Posts from blogs I follow around the net</h2><ul><li><a href=https://utcc.utoronto.ca/~cks/space/blog/linux/NFSv4ServerLockClients target=_blank rel=noopener>Finding which NFSv4 client owns a lock on a Linux NFS(v4) server</a> — <a href=https://utcc.utoronto.ca/~cks/space/blog/>Chris's Wiki :: blog</a><div>A while back I wrote an entry about finding which NFS client owns
70a lock on a Linux NFS server, which turned
71out to be specific to NFS v3 (which I really should have seen coming,
72since it involved NLM and lockd). Finding the NFS v4 client that
73owns a lock is, depending on your perspective, either simpl…<li><a href=http://www.landley.net/notes-2023.html#28-10-2023 target=_blank rel=noopener>October 28, 2023</a> — <a href=http://www.landley.net/notes-2023.html>Rob Landley's Blog Thing for 2023</a><div>Oh good grief, two of my least favorite licensing people, Larry Rosen
74and Bradley Kuhn, are interacting on the OSI's license-discuss
75list where the're doing
76bad computer history and insisting that a guy Larry Rosen
77coincidentally interviewed for a book years ago is clearly the origin of
78somethin…<li><a href="http://offbeatpursuit.com:80/blog/?id=25" target=_blank rel=noopener>A fix by any other name</a> — <a href=http://offbeatpursuit.com:80/blog/>WLOG - blog</a><div>tags:
79i2c, plan9
80Another month, another file system.
81Well, if you can’t fix it in software, fix it in hardware (looking at
82you, bme680, we’re not
83done yet). The show must go on, as they say, and I would like my
84experiments to go on.
85So a “new” addition to the environmental sensor family connected to
86the h…<li><a href=https://mirzapandzo.com/next-image-url-parameter-is-valid-but-upstream-response-is-invalid target=_blank rel=noopener>Next/Image "url" parameter is valid but upstream response is invalid</a> — <a href=https://mirzapandzo.com/>Mirza Pandzo's Blog</a><div>Getting "url" parameter is valid but upstream response is invalid error with Next/Image on WSL2<li><a href=https://drewdevault.com/2023/10/13/Going-off-script.html target=_blank rel=noopener>Going off-script</a> — <a href=https://drewdevault.com>Drew DeVault's blog</a><div>There is a phenomenon in society which I find quite bizarre. Upon our entry to
87this mortal coil, we are endowed with self-awareness, agency, and free will.
88Each of the 8 billion members of this human race represents a unique person, a
89unique worldview, and a unique agency. Yet, many of us have the sam…<li><a href=https://szymonkaliski.com/writing/2023-10-02-building-a-diy-pen-plotter/ target=_blank rel=noopener>Building a DIY Pen Plotter</a> — <a href=http://github.com/dylang/node-rss>Szymon Kaliski</a><div>This article documents my learnings from designing and building a DIY Pen Plotter during the summer of 2023.
90My ultimate goal is to build my…<li><a href=https://neil.computer/notes/chart-of-accounts-for-startups-and-saas-companies/ target=_blank rel=noopener>Chart of Accounts for Startups and SaaS Companies</a> — <a href=https://neil.computer/>Neil Panchal</a><div>Accounting is fundamental to starting a business. You need to have a basic understanding of accounting principles and essential bookkeeping. I had to learn it. There was no choice. For filing taxes, your CPA is going to ask you for an Income Statement (also known as P/L statement). If<li><a href=https://journal.valeriansaliou.name/deploy-a-nomad-cluster-on-alpine-linux-with-vultr/ target=_blank rel=noopener>Deploy a Nomad Cluster on Alpine Linux with Vultr</a> — <a href=https://journal.valeriansaliou.name/>Valerian Saliou</a><div>After spending countless hours trying to understand how to deploy my apps on Kubernetes for the first time to host Mirage, an AI API service that I run, I ended up making myself a promise that the next app I work on would be using a more productive & simpler<li><a href=https://jcs.org/2023/10/25/wifi_da target=_blank rel=noopener>BlueSCSI Wi-Fi Desk Accessory 1.0 Released</a> — <a href=https://jcs.org/>joshua stein</a><div>BlueSCSI Wi-Fi Desk Accessory
911.0 has been released:
92wifi_da-1.0.sit
93(StuffIt 3 archive)
94SHA256: ccfc9d27dd5da7412d10cef73b81119a1fec3848e4d1d88ff652a07ffdc6a69aSHA1: ff124972f202ceda6d7fa4788110a67ccda6a13a
95This is the initial public release of my BlueSCSI Wi-Fi Desk Accessory for
96classic MacOS.<li><a href=https://michael.stapelberg.ch/posts/2023-10-25-my-all-flash-zfs-network-storage-build/ target=_blank rel=noopener>My 2023 all-flash ZFS NAS (Network Storage) build</a> — <a href=https://michael.stapelberg.ch/>Michael Stapelbergs Website</a><div>For over 10 years now, I run two self-built NAS (Network Storage) devices which serve media (currently via Jellyfin) and run daily backups of all my PCs and servers.
97In this article, I describe my goals, which hardware I picked for my new build (and why) and how I set it up.
98Design Goals
99I use my netw…</ul><p>Generated with <a href=https://git.sr.ht/~sircmpwn/openring target=_blank rel=noopener>openring</a>.</section><footer><hr><p><big><strong>Want to comment or have something to add?</strong></big><p>You can write me an email
100at <a href=mailto:mitja.felicijan@gmail.com>mitja.felicijan@gmail.com</a> or
101catch up with me <a href=https://telegram.me/mitjafelicijan target=_blank>on Telegram</a>.<hr><p>This website does not track you. Content is made available under the <a href=https://creativecommons.org/licenses/by/4.0/ target=_blank rel=noreferrer>CC BY 4.0 license</a> unless
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