From 9f5454bda6299db43a4e9de5b3716471388b81d9 Mon Sep 17 00:00:00 2001 From: Mitja Felicijan Date: Sat, 27 Aug 2022 14:05:48 +0200 Subject: Move blog to Hugo --- posts/2021-06-26-simple-world-clock.md | 89 ---------------------------------- 1 file changed, 89 deletions(-) delete mode 100644 posts/2021-06-26-simple-world-clock.md (limited to 'posts/2021-06-26-simple-world-clock.md') diff --git a/posts/2021-06-26-simple-world-clock.md b/posts/2021-06-26-simple-world-clock.md deleted file mode 100644 index 29c199a..0000000 --- a/posts/2021-06-26-simple-world-clock.md +++ /dev/null @@ -1,89 +0,0 @@ ---- -Title: Simple world clock with eInk display and Raspberry Pi Zero -Description: Simple world clockwith eInk display and Raspberry Pi Zero -Slug: simple-world-clock-with-eiink-display-and-raspberry-pi-zero -Listing: true -Created: 2021-06-26 -Tags: [] ---- - -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. - - - -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. -- cgit v1.2.3