Vaccinations for COVID are well underway in most countries, and what better way to keep track of vaccinations for your country or region than with a battery-powered, refrigerator magnet that's connected to the internet. This project makes use of the eInk display and the internet capabilities of the ESP32-S2 to automatically display and update the latest vaccination numbers on your Adafruit MagTag.

Parts

This kit contains all the parts except for a cable:

MagTag dev board with enclosure pieces, four magnet feet, and lipoly battery
The Adafruit MagTag combines the new ESP32-S2 wireless module and a 2.9" grayscale E-Ink display to make a low-power IoT display that can show data on its screen...
Out of Stock

Or get the pieces separately:

Angled shot of Adafruit MagTag development board with ESP32-S2 and E-Ink display.
The Adafruit MagTag combines the new ESP32-S2 wireless module and a 2.9" grayscale E-Ink display to make a low-power IoT display that can show data on its screen even when power...
Out of Stock
Angled shot of four magnet feet.
Got a glorious RGB Matrix project you want to mount and display in your workspace or home? If you have one of the matrix panels listed below, you'll need a pack of these...
$2.50
In Stock
Lithium Ion Polymer Battery 3.7v 420mAh with JST 2-PH connector and short cable
Lithium-ion polymer (also known as 'lipo' or 'lipoly') batteries are thin, light, and powerful. The output ranges from 4.2V when completely charged to 3.7V. This...
Out of Stock

Get a USB-A to USB-C cable to connect your computer to the MagTag:

USB Type A to Type C Cable - 1ft - 0.3 meter
As technology changes and adapts, so does Adafruit. This  USB Type A to Type C cable will help you with the transition to USB C, even if you're still...
Out of Stock
USB Type A to Type C Cable - approx 1 meter / 3 ft long
As technology changes and adapts, so does Adafruit. This  USB Type A to Type C cable will help you with the transition to USB C, even if you're still...
$4.95
In Stock

CircuitPython is a derivative of MicroPython designed to simplify experimentation and education on low-cost microcontrollers. It makes it easier than ever to get prototyping by requiring no upfront desktop software downloads. Simply copy and edit files on the CIRCUITPY drive to iterate.

Set Up CircuitPython

Follow the steps to get CircuitPython installed on your MagTag.

Click the link above and download the latest .BIN and .UF2 file

(depending on how you program the ESP32S2 board you may need one or the other, might as well get both)

Download and save it to your desktop (or wherever is handy).

Plug your MagTag into your computer using a known-good USB cable.

A lot of people end up using charge-only USB cables and it is very frustrating! So make sure you have a USB cable you know is good for data sync.

Option 1 - Load with UF2 Bootloader

This is by far the easiest way to load CircuitPython. However it requires your board has the UF2 bootloader installed. Some early boards do not (we hadn't written UF2 yet!) - in which case you can load using the built in ROM bootloader.

Still, try this first!

Try Launching UF2 Bootloader

Loading CircuitPython by drag-n-drop UF2 bootloader is the easier way and we recommend it. If you have a MagTag where the front of the board is black, your MagTag came with UF2 already on it.

Launch UF2 by double-clicking the Reset button (the one next to the USB C port). You may have to try a few times to get the timing right.

If the UF2 bootloader is installed, you will see a new disk drive appear called MAGTAGBOOT

Copy the UF2 file you downloaded at the first step of this tutorial onto the MAGTAGBOOT drive

If you're using Windows and you get an error at the end of the file copy that says Error from the file copy, Error 0x800701B1: A device which does not exist was specified. You can ignore this error, the bootloader sometimes disconnects without telling Windows, the install completed just fine and you can continue. If its really annoying, you can also upgrade the bootloader (the latest version of the UF2 bootloader fixes this warning)

Your board should auto-reset into CircuitPython, or you may need to press reset. A CIRCUITPY drive will appear. You're done! Go to the next pages.

Option 2 - Use esptool to load BIN file

If you have an original MagTag with while soldermask on the front, we didn't have UF2 written for the ESP32S2 yet so it will not come with the UF2 bootloader.

You can upload with esptool to the ROM (hardware) bootloader instead!

Follow the initial steps found in the Run esptool and check connection section of the ROM Bootloader page to verify your environment is set up, your board is successfully connected, and which port it's using.

In the final command to write a binary file to the board, replace the port with your port, and replace "firmware.bin" with the the file you downloaded above.

The output should look something like the output in the image.

Press reset to exit the bootloader.

Your CIRCUITPY drive should appear!

You're all set! Go to the next pages.

Option 3 - Use Chrome Browser To Upload BIN file

If for some reason you cannot get esptool to run, you can always try using the Chrome-browser version of esptool we have written. This is handy if you don't have Python on your computer, or something is really weird with your setup that makes esptool not run (which happens sometimes and isn't worth debugging!) You can follow along on the Web Serial ESPTool page and either load the UF2 bootloader and then come back to Option 1 on this page, or you can download the CircuitPython BIN file directly using the tool in the same manner as the bootloader.

One of the great things about the ESP32 is the built-in WiFi capabilities. This page covers the basics of getting connected using CircuitPython.

The first thing you need to do is update your code.py to the following. Click the Download Project Bundle button below to download the necessary libraries and the code.py file in a zip file. Extract the contents of the zip file, and copy the entire lib folder and the code.py file to your CIRCUITPY drive.

# SPDX-FileCopyrightText: 2020 Brent Rubell for Adafruit Industries
#
# SPDX-License-Identifier: MIT

import os
import ipaddress
import ssl
import wifi
import socketpool
import adafruit_requests

# URLs to fetch from
TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"
JSON_QUOTES_URL = "https://www.adafruit.com/api/quotes.php"
JSON_STARS_URL = "https://api.github.com/repos/adafruit/circuitpython"

print("ESP32-S2 WebClient Test")

print(f"My MAC address: {[hex(i) for i in wifi.radio.mac_address]}")

print("Available WiFi networks:")
for network in wifi.radio.start_scanning_networks():
    print("\t%s\t\tRSSI: %d\tChannel: %d" % (str(network.ssid, "utf-8"),
                                             network.rssi, network.channel))
wifi.radio.stop_scanning_networks()

print(f"Connecting to {os.getenv('CIRCUITPY_WIFI_SSID')}")
wifi.radio.connect(os.getenv("CIRCUITPY_WIFI_SSID"), os.getenv("CIRCUITPY_WIFI_PASSWORD"))
print(f"Connected to {os.getenv('CIRCUITPY_WIFI_SSID')}")
print(f"My IP address: {wifi.radio.ipv4_address}")

ping_ip = ipaddress.IPv4Address("8.8.8.8")
ping = wifi.radio.ping(ip=ping_ip)

# retry once if timed out
if ping is None:
    ping = wifi.radio.ping(ip=ping_ip)

if ping is None:
    print("Couldn't ping 'google.com' successfully")
else:
    # convert s to ms
    print(f"Pinging 'google.com' took: {ping * 1000} ms")

pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())

print(f"Fetching text from {TEXT_URL}")
response = requests.get(TEXT_URL)
print("-" * 40)
print(response.text)
print("-" * 40)

print(f"Fetching json from {JSON_QUOTES_URL}")
response = requests.get(JSON_QUOTES_URL)
print("-" * 40)
print(response.json())
print("-" * 40)

print()

print(f"Fetching and parsing json from {JSON_STARS_URL}")
response = requests.get(JSON_STARS_URL)
print("-" * 40)
print(f"CircuitPython GitHub Stars: {response.json()['stargazers_count']}")
print("-" * 40)

print("Done")

Your CIRCUITPY drive should resemble the following.

CIRCUITPY

To get connected, the next thing you need to do is update the settings.toml file.

The settings.toml File

We expect people to share tons of projects as they build CircuitPython WiFi widgets. What we want to avoid is people accidentally sharing their passwords or secret tokens and API keys. So, we designed all our examples to use a settings.toml file, that is on your CIRCUITPY drive, to hold secret/private/custom data. That way you can share your main project without worrying about accidentally sharing private stuff.

If you have a fresh install of CircuitPython on your board, the initial settings.toml file on your CIRCUITPY drive is empty.

To get started, you can update the settings.toml on your CIRCUITPY drive to contain the following code.

# SPDX-FileCopyrightText: 2023 Adafruit Industries
#
# SPDX-License-Identifier: MIT

# This is where you store the credentials necessary for your code.
# The associated demo only requires WiFi, but you can include any
# credentials here, such as Adafruit IO username and key, etc.
CIRCUITPY_WIFI_SSID = "your-wifi-ssid"
CIRCUITPY_WIFI_PASSWORD = "your-wifi-password"

This file should contain a series of Python variables, each assigned to a string. Each variable should describe what it represents (say wifi_ssid), followed by an (equals sign), followed by the data in the form of a Python string (such as "my-wifi-password" including the quote marks).

At a minimum you'll need to add/update your WiFi SSID and WiFi password, so do that now!

As you make projects you may need more tokens and keys, just add them one line at a time. See for example other tokens such as one for accessing GitHub or the Hackaday API. Other non-secret data like your timezone can also go here.

For the correct time zone string, look at http://worldtimeapi.org/timezones and remember that if your city is not listed, look for a city in the same time zone, for example Boston, New York, Philadelphia, Washington DC, and Miami are all on the same time as New York.

Of course, don't share your settings.toml - keep that out of GitHub, Discord or other project-sharing sites.

Don't share your settings.toml file! It has your passwords and API keys in it!

If you connect to the serial console, you should see something like the following:

In order, the example code...

Checks the ESP32's MAC address.

print(f"My MAC address: {[hex(i) for i in wifi.radio.mac_address]}")

Performs a scan of all access points and prints out the access point's name (SSID), signal strength (RSSI), and channel.

print("Available WiFi networks:")
for network in wifi.radio.start_scanning_networks():
    print("\t%s\t\tRSSI: %d\tChannel: %d" % (str(network.ssid, "utf-8"),
                                             network.rssi, network.channel))
wifi.radio.stop_scanning_networks()

Connects to the access point you defined in the settings.toml file, and prints out its local IP address.

print(f"Connecting to {os.getenv('WIFI_SSID')}")
wifi.radio.connect(os.getenv("WIFI_SSID"), os.getenv("WIFI_PASSWORD"))
print(f"Connected to {os.getenv('WIFI_SSID')}")
print(f"My IP address: {wifi.radio.ipv4_address}")

Attempts to ping a Google DNS server to test connectivity. If a ping fails, it returns None. Initial pings can sometimes fail for various reasons. So, if the initial ping is successful (is not None), it will print the echo speed in ms. If the initial ping fails, it will try one more time to ping, and then print the returned value. If the second ping fails, it will result in "Ping google.com: None ms" being printed to the serial console. Failure to ping does not always indicate a lack of connectivity, so the code will continue to run.

ping_ip = ipaddress.IPv4Address("8.8.8.8")
ping = wifi.radio.ping(ip=ping_ip) * 1000
if ping is not None:
    print(f"Ping google.com: {ping} ms")
else:
    ping = wifi.radio.ping(ip=ping_ip)
    print(f"Ping google.com: {ping} ms")

The code creates a socketpool using the wifi radio's available sockets. This is performed so we don't need to re-use sockets. Then, it initializes a a new instance of the requests interface - which makes getting data from the internet really really easy.

pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())

To read in plain-text from a web URL, call requests.get - you may pass in either a http, or a https url for SSL connectivity. 

print(f"Fetching text from {TEXT_URL}")
response = requests.get(TEXT_URL)
print("-" * 40)
print(response.text)
print("-" * 40)

Requests can also display a JSON-formatted response from a web URL using a call to requests.get

print(f"Fetching json from {JSON_QUOTES_URL}")
response = requests.get(JSON_QUOTES_URL)
print("-" * 40)
print(response.json())
print("-" * 40)

Finally, you can fetch and parse a JSON URL using requests.get. This code snippet obtains the stargazers_count field from a call to the GitHub API.

print(f"Fetching and parsing json from {JSON_STARS_URL}")
response = requests.get(JSON_STARS_URL)
print("-" * 40)
print(f"CircuitPython GitHub Stars: {response.json()['stargazers_count']}")
print("-" * 40)

OK you now have your ESP32 board set up with a proper settings.toml file and can connect over the Internet. If not, check that your settings.toml file has the right SSID and password and retrace your steps until you get the Internet connectivity working!

IPv6 Networking

Starting in CircuitPython 9.2, IPv6 networking is available on most Espressif wifi boards. Socket-using libraries like adafruit_requests and adafruit_ntp will need to be updated to use the new APIs and for now can only connect to services on IPv4.

IPv6 connectivity & privacy

IPv6 addresses are divided into many special kinds, and many of those kinds (like those starting with FC, FD, FE) are private or local; Addresses starting with other prefixes like 2002: and 2001: are globally routable. In 2024, far from all ISPs and home networks support IPv6 internet connectivity. For more info consult resources like Wikipedia. If you're interested in global IPv6 connectivity you can use services like Hurricane Electric to create an "IPv6 tunnel" (free as of 2024, but requires expertise and a compatible router or host computer to set up)

It's also important to be aware that, as currently implemented by Espressif, there are privacy concerns especially when these devices operate on the global IPv6 network: The device's unique identifier (its EUI-64 or MAC address) is used by default as part of its IPv6 address. This means that the device identity can be tracked across multiple networks by any service it connects to.

Enable IPv6 networking

Due to the privacy consideration, IPv6 networking is not automatically enabled. Instead, it must be explicitly enabled by a call to start_dhcp_client with the ipv6=True argument specified:

wifi.start_dhcp_client(ipv6=True)

Check IP addresses

The read-only addresses property of the wifi.radio object holds all addresses, including IPv4 and IPv6 addresses:

>>> wifi.radio.addresses
('FE80::7EDF:A1FF:FE00:518C', 'FD5F:3F5C:FE50:0:7EDF:A1FF:FE00:518C', '10.0.3.96')

The wifi.radio.dns servers can be IPv4 or IPv6:

>>> wifi.radio.dns
('FD5F:3F5C:FE50::1',)
>>> wifi.radio.dns = ("1.1.1.1",)
>>> wifi.radio.dns
('1.1.1.1',)

Ping v6 networks

wifi.radio.ping accepts v6 addresses and names:

>>> wifi.radio.ping("google.com")
0.043
>>> wifi.radio.ping("ipv6.google.com")
0.048

Create & use IPv6 sockets

Use the address family socket.AF_INET6. After the socket is created, use methods like connect, send, recfrom_into, etc just like for IPv4 sockets. This code snippet shows communicating with a private-network NTP server; this IPv6 address will not work on your network:

>>> ntp_addr = ("fd5f:3f5c:fe50::20e", 123)
>>> PACKET_SIZE = 48
>>> 
>>> buf = bytearray(PACKET_SIZE)
>>> with socket.socket(socket.AF_INET6, socket.SOCK_DGRAM) as s:
...     s.settimeout(1)
...     buf[0] = 0b0010_0011
...     s.sendto(buf, ntp_addr)
...     print(s.recvfrom_into(buf))
...     print(buf)
... 
48
(48, ('fd5f:3f5c:fe50::20e', 123))
bytearray(b'$\x01\x03\xeb\x00\x00\x00\x00\x00\x00\x00GGPS\x00\xeaA0h\x07s;\xc0\x00\x00\x00\x00\x00\x00\x00\x00\xeaA0n\xeb4\x82-\xeaA0n\xebAU\xb1')

A very common need for projects is to know the current date and time. Especially when you want to deep sleep until an event, or you want to change your display based on what day, time, date, etc. it is

Determining the correct local time is really really hard. There are various time zones, Daylight Savings dates, leap seconds, etc. Trying to get NTP time and then back-calculating what the local time is, is extraordinarily hard on a microcontroller just isn't worth the effort and it will get out of sync as laws change anyways.

For that reason, we have the free adafruit.io time service. Free for anyone with a free adafruit.io account. You do need an account because we have to keep accidentally mis-programmed-board from overwhelming adafruit.io and lock them out temporarily. Again, it's free!

There are other services like WorldTimeAPI, but we don't use those for our guides because they are nice people and we don't want to accidentally overload their site. Also, there's a chance it may eventually go down or also require an account.

Step 1) Make an Adafruit account

It's free! Visit https://accounts.adafruit.com/ to register and make an account if you do not already have one

Step 2) Sign into Adafruit IO

Head over to io.adafruit.com and click Sign In to log into IO using your Adafruit account. It's free and fast to join.

Step 3) Get your Adafruit IO Key

Click on My Key in the top bar

adafruit_products_image.png
"My Key" has been replaced with a key-shaped icon!

You will get a popup with your Username and Key (In this screenshot, we've covered it with red blocks)

Go to the settings.toml file on your CIRCUITPY drive and add three lines for AIO_USERNAME, ADAFRUIT_AIO_KEY and TIMEZONE so you get something like the following:

# This file is where you keep secret settings, passwords, and tokens!
# If you put them in the code you risk committing that info or sharing it

CIRCUITPY_WIFI_SSID = "your-wifi-ssid"
CIRCUITPY_WIFI_PASSWORD = "your-wifi-password"
ADAFRUIT_AIO_USERAME = "your-adafruit-io-username"
ADAFTUIT_AIO_KEY = "your-adafruit-io-key"
# Timezone names from http://worldtimeapi.org/timezones
TIMEZONE="America/New_York"

The timezone is optional, if you don't have that entry, adafruit.io will guess your timezone based on geographic IP address lookup. You can visit http://worldtimeapi.org/timezones to see all the time zones available (even though we do not use Worldtime for time-keeping, we do use the same time zone table).

Step 4) Upload Test Python Code

This code is like the Internet Test code from before, but this time it will connect to adafruit.io and get the local time

import ipaddress
import os
import ssl
import wifi
import socketpool
import adafruit_requests
import secrets


# Get our username, key and desired timezone
ssid = os.getenv("CIRCUITPY_WIFI_SSID")
password = os.getenv("CIRCUITPY_WIFI_PASSWORD")
aio_username = os.getenv("ADAFRUIT_AIO_USERNAME")
aio_key = os.getenv("ADAFRUIT_AIO_KEY")
timezone = os.getenv("TIMEZONE")
TIME_URL = f"https://io.adafruit.com/api/v2/{aio_username}/integrations/time/strftime?x-aio-key={aio_key}&tz={timezone}")
TIME_URL += "&fmt=%25Y-%25m-%25d+%25H%3A%25M%3A%25S.%25L+%25j+%25u+%25z+%25Z"

print("ESP32-S2 Adafruit IO Time test")

print("My MAC addr:", [hex(i) for i in wifi.radio.mac_address])

print("Available WiFi networks:")
for network in wifi.radio.start_scanning_networks():
    print("\t%s\t\tRSSI: %d\tChannel: %d" % (str(network.ssid, "utf-8"),
            network.rssi, network.channel))
wifi.radio.stop_scanning_networks()

print("Connecting to", ssid)
wifi.radio.connect(ssid, password)
print(f"Connected to {ssid}!")
print("My IP address is", wifi.radio.ipv4_address)

ipv4 = ipaddress.ip_address("8.8.4.4")
print("Ping google.com:", wifi.radio.ping(ipv4), "ms")

pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())

print("Fetching text from", TIME_URL)
response = requests.get(TIME_URL)
print("-" * 40)
print(response.text)
print("-" * 40)

After running this, you will see something like the below text. We have blocked out the part with the secret username and key data!

Note at the end you will get the date, time, and your timezone! If so, you have correctly configured your settings.toml and can continue to the next steps!

Installing the Project Code

To use with CircuitPython, you need to first install a few libraries, into the lib folder on your CIRCUITPY drive. Then you need to update code.py with the example script.

Thankfully, we can do this in one go. In the example below, click the Download Project Bundle button below to download the necessary libraries and the code.py file in a zip file. Extract the contents of the zip file, open the directory MagTag_Covid_Vaccination/ and then click on the directory that matches the version of CircuitPython you're using and copy the contents of that directory to your CIRCUITPY drive.

Your CIRCUITPY drive should now look similar to the following image:

Be sure you have the secrets.py file complete and loaded onto the CIRCUITPY drive also or the code will not run properly.

# SPDX-FileCopyrightText: 2021 Eva Herrada for Adafruit Industries
#
# SPDX-License-Identifier: MIT

from adafruit_magtag.magtag import MagTag
from adafruit_progressbar.progressbar import ProgressBar

# Set up where we'll be fetching data from
DATA_SOURCE = "https://raw.githubusercontent.com/owid/covid-19-data/master/public/data/vaccinations/country_data/United%20States.csv"  # pylint: disable=line-too-long
# Find data for other countries/states here:
# https://github.com/owid/covid-19-data/tree/master/public/data/vaccinations

magtag = MagTag(url=DATA_SOURCE)
magtag.network.connect()

magtag.add_text(
    text_font="/fonts/ncenR14.pcf",
    text_position=(
        (magtag.graphics.display.width // 2) - 1,
        8,
    ),
    text_anchor_point=(0.5, 0.5),
    is_data=False,
)  # Title

magtag.add_text(
    text_font="/fonts/ncenR14.pcf",
    text_position=(
        (magtag.graphics.display.width // 2) - 1,
        23,
    ),
    text_anchor_point=(0.5, 0.5),
    is_data=False,
)  # Date

magtag.add_text(
    text_font="/fonts/ncenR14.pcf",
    text_position=(
        (magtag.graphics.display.width // 2) - 1,
        40,
    ),
    text_anchor_point=(0.5, 0.5),
    is_data=False,
)  # Vaccinated text

magtag.add_text(
    text_font="/fonts/ncenR14.pcf",
    text_position=(
        (magtag.graphics.display.width // 2) - 1,
        85,
    ),
    text_anchor_point=(0.5, 0.5),
    is_data=False,
)  # Fully vaccinated text

BAR_WIDTH = magtag.graphics.display.width - 80
BAR_HEIGHT = 25
BAR_X = magtag.graphics.display.width // 2 - BAR_WIDTH // 2

progress_bar = ProgressBar(
    BAR_X, 50, BAR_WIDTH, BAR_HEIGHT, 1.0, bar_color=0x999999, outline_color=0x000000
)

progress_bar_1 = ProgressBar(
    BAR_X, 95, BAR_WIDTH, BAR_HEIGHT, 1.0, bar_color=0x999999, outline_color=0x000000
)

magtag.graphics.splash.append(progress_bar)
magtag.graphics.splash.append(progress_bar_1)
magtag.graphics.set_background("/bmps/background.bmp")


def l_split(line):
    line_list = []
    print(line)
    while "," in line:
        if line[0] == '"':
            temp = line.split('"', 2)[1]
            line_list.append(temp)
            line = line.split('"', 2)[2][1:]
        else:
            temp, line = line.split(",", 1)
            line_list.append(temp)
    line_list.append(line)
    return line_list


try:
    table = magtag.fetch().split("\n")
    columns = l_split(table[0])
    latest = l_split(table[-2])
    print(columns)
    print(latest)
    value = dict(zip(columns, latest))
    print("Response is", value)
    print(value)

    vaccinated = int(value["people_vaccinated"]) / 331984513
    fully_vaccinated = int(value["people_fully_vaccinated"]) / 331984513

    magtag.set_text(f"{value['location']} Vaccination Rates", 0, False)
    magtag.set_text(value["date"], 1, False)
    magtag.set_text("Vaccinated: {:.2f}%".format(vaccinated * 100), 2, False)
    magtag.set_text(
        "Fully Vaccinated: {:.2f}%".format(fully_vaccinated * 100), 3, False
    )

    progress_bar.progress = vaccinated
    progress_bar_1.progress = fully_vaccinated

    magtag.refresh()

    SECONDS_TO_SLEEP = 24 * 60 * 60  # Sleep for one day

except (ValueError, RuntimeError, ConnectionError, OSError) as e:
    print("Some error occured, retrying in one hour! -", e)
    seconds_to_sleep = 60 * 60  # Sleep for one hour

print(f"Sleeping for {SECONDS_TO_SLEEP} seconds")
magtag.exit_and_deep_sleep(SECONDS_TO_SLEEP)

Code Run Through

First, the code imports the two required libraries.

from adafruit_magtag.magtag import MagTag
from adafruit_progressbar import ProgressBar

Next, the code defines where it'll be getting the data from, initializes the MagTag object and tells it to connect to the network defined in secrets.py.

# Set up where we'll be fetching data from
DATA_SOURCE = "https://raw.githubusercontent.com/owid/covid-19-data/master/public/data/vaccinations/country_data/United%20States.csv"
# Find data for other countries/states here:
# https://github.com/owid/covid-19-data/tree/master/public/data/vaccinations

magtag = MagTag(url=DATA_SOURCE)
magtag.network.connect()

Then, the four text fields are defined. These are individually set by passing the set_text method a number that corresponds to the order the specific text field was created.

magtag.add_text(
    text_font="/fonts/ncenR14.pcf",
    text_position=((magtag.graphics.display.width // 2) - 1, 8,),
    text_anchor_point=(0.5, 0.5),
    is_data=False,
)  # Title

magtag.add_text(
    text_font="/fonts/ncenR14.pcf",
    text_position=((magtag.graphics.display.width // 2) - 1, 23,),
    text_anchor_point=(0.5, 0.5),
    is_data=False,
)  # Date

magtag.add_text(
    text_font="/fonts/ncenR14.pcf",
    text_position=((magtag.graphics.display.width // 2) - 1, 40,),
    text_anchor_point=(0.5, 0.5),
    is_data=False,
)  # Vaccinated text

magtag.add_text(
    text_font="/fonts/ncenR14.pcf",
    text_position=((magtag.graphics.display.width // 2) - 1, 85,),
    text_anchor_point=(0.5, 0.5),
    is_data=False,
)  # Fully vaccinated text

After that, the progress bars are set up. The top one will track the percent of people who have been partially vaccinated and the bottom one will track the percent of people who have been fully vaccinated.

BAR_WIDTH = magtag.graphics.display.width - 80
BAR_HEIGHT = 25
BAR_X = magtag.graphics.display.width // 2 - BAR_WIDTH // 2

progress_bar = ProgressBar(
    BAR_X, 50, BAR_WIDTH, BAR_HEIGHT, 1.0, bar_color=0x999999, outline_color=0x000000
)

progress_bar_1 = ProgressBar(
    BAR_X, 95, BAR_WIDTH, BAR_HEIGHT, 1.0, bar_color=0x999999, outline_color=0x000000
)

magtag.graphics.splash.append(progress_bar)
magtag.graphics.splash.append(progress_bar_1)
magtag.graphics.set_background("/bmps/background.bmp")

The code now enters the try part of the try/except block. It first gets the csv data from the URL defined above, then splits it by line, gets the latest line, and splits it into a list so it can be used easier. After that, the percent of people who have been partially and fully vaccinated is calculated. The four text fields are then all set to their respective values and the progress bars are updated. Assuming everything has gone well so far, the display is then refreshed.

Finally, the MagTag sleeps for a day, at which point this code will run again.

Please note that if you change the country you are getting the data for, you will also have to change the population (the denominators in vaccinated and fully_vaccinated) to match that.
try:
    value = magtag.fetch().split("\n")[-2].split(",")
    print("Response is", value)

    vaccinated = int(value[-2]) / 331984513
    fully_vaccinated = int(value[-1]) / 331984513

    magtag.set_text(f"{value[0]} Vaccination Rates", 0, False)
    magtag.set_text(value[1], 1, False)
    magtag.set_text("Vaccinated: {:.2f}%".format(vaccinated * 100), 2, False)
    magtag.set_text(
        "Fully Vaccinated: {:.2f}%".format(fully_vaccinated * 100), 3, False
    )

    progress_bar.progress = vaccinated
    progress_bar_1.progress = fully_vaccinated

    magtag.refresh()
    
    seconds_to_sleep = 24 * 60 * 60  # Sleep for one day
    print(f"Sleeping for {seconds_to_sleep} seconds")
    magtag.exit_and_deep_sleep(seconds_to_sleep)

However, if an issue has occurred, the code prints it out and tries again.

except (ValueError, RuntimeError) as e:
    print("Some error occured, retrying! -", e)

This guide was first published on Mar 19, 2021. It was last updated on Jul 23, 2024.