# MagTag Tides Viewer ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/097/408/medium800/wireless_banner2.jpg?1607034330) Tides are a fun thing to track if you live near the ocean. The information is even useful for any activity that is tide dependent, like surfing, boating, or just plain swimming. This guide will show you how to use an [Adafruit MagTag](https://www.adafruit.com/product/4800) to fetch and display daily tide information. It will show the times for the high and low events for the day as well as a neat little plot. [CircuitPython](https://learn.adafruit.com/welcome-to-circuitpython) is used for the code and the MagTag library takes care of most of the heavy lifting. Just change the code to set your local tide [station ID](https://tidesandcurrents.noaa.gov/), and you are good to go. After updating, the MagTag goes into a deep sleep until 3 am the next morning, so it can stay on your fridge for a few weeks between recharges. ## Parts Here are the parts you'll need for this project. You can get them individually: ### Adafruit MagTag - 2.9" Grayscale E-Ink WiFi Display [Adafruit MagTag - 2.9" Grayscale E-Ink WiFi Display](https://www.adafruit.com/product/4800) The Adafruit MagTag combines the 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 is removed! The ESP32-S2 is great because it builds on the years of code and support for the ESP32 and also adds... Out of Stock [Buy Now](https://www.adafruit.com/product/4800) [Related Guides to the Product](https://learn.adafruit.com/products/4800/guides) ![Angled shot of rectangle-shaped electronic ink display breakout with the text: "MAGTAG 2025 Edition with SSD1680 Chipset"](https://cdn-shop.adafruit.com/640x480/4800-10.jpg) ### Lithium Ion Polymer Battery with Short Cable - 3.7V 420mAh [Lithium Ion Polymer Battery with Short Cable - 3.7V 420mAh](https://www.adafruit.com/product/4236) 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 battery has a capacity of 420mAh for a total of about 1.55 Wh. If you need a larger (or smaller!) battery, In Stock [Buy Now](https://www.adafruit.com/product/4236) [Related Guides to the Product](https://learn.adafruit.com/products/4236/guides) ![Lithium Ion Polymer Battery 3.7v 420mAh with JST 2-PH connector and short cable](https://cdn-shop.adafruit.com/640x480/4236-04.jpg) ### Mini Magnet Feet for RGB LED Matrices (Pack of 4) [Mini Magnet Feet for RGB LED Matrices (Pack of 4)](https://www.adafruit.com/product/4631) 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 **Mini-Magnet Feet.**  We got these specifically for our RGB LED Matrices, which no longer... In Stock [Buy Now](https://www.adafruit.com/product/4631) [Related Guides to the Product](https://learn.adafruit.com/products/4631/guides) ![Angled shot of four magnet feet.](https://cdn-shop.adafruit.com/640x480/4631-00.jpg) **OR** these items are also available together as a kit: ### Adafruit MagTag Starter Kit - ADABOX017 Essentials [Adafruit MagTag Starter Kit - ADABOX017 Essentials](https://www.adafruit.com/product/4819) 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 is removed! The ESP32-S2 is great because it builds on the years of code and support for the... In Stock [Buy Now](https://www.adafruit.com/product/4819) [Related Guides to the Product](https://learn.adafruit.com/products/4819/guides) ![MagTag dev board with enclosure pieces, four magnet feet, and lipoly battery](https://cdn-shop.adafruit.com/640x480/4819-02.jpg) # MagTag Tides Viewer ## Install CircuitPython Danger: Make sure that you [update the TinyUF2 Bootloader](https://learn.adafruit.com/adafruit-magtag/update-tinyuf2-bootloader-for-circuitpython-10-4mb-boards-only) before installing CircuitPython! ### Adafruit MagTag - Update TinyUF2 Bootloader for CircuitPython 10 and Later [Adafruit MagTag](https://learn.adafruit.com/adafruit-magtag) [Update TinyUF2 Bootloader for CircuitPython 10 and Later](https://learn.adafruit.com/adafruit-magtag/update-tinyuf2-bootloader-for-circuitpython-10-4mb-boards-only) [CircuitPython](https://github.com/adafruit/circuitpython) is a derivative of [MicroPython](https://micropython.org) 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. [CircuitPython Download for MagTag](https://circuitpython.org/board/adafruit_magtag_2.9_grayscale/) Warning: WARNING: The updated Adafruit MagTag 2025 Edition will not work with CircuitPython 9.2.x or earlier. Make sure you install 10.x.x or later! **Click the link above and download the latest .BIN and .UF2 file** You can use a 9.x.x release for a pre-2025 MagTag. You  **must** use a 10.x.x release for the updated MagTag 2025 Edition. (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). ![](https://cdn-learn.adafruit.com/assets/assets/000/138/625/medium640/adafruit_products_magtag-9.2.8.png?1753973423) ![](https://cdn-learn.adafruit.com/assets/assets/000/138/626/medium640/adafruit_products_magtag-10.0.0-beta.2.png?1753973581) 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.** ![adafruit_products_MagTag_top.jpg](https://cdn-learn.adafruit.com/assets/assets/000/096/955/medium640/adafruit_products_MagTag_top.jpg?1605035864) # 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! Warning: Make sure that you [update the TinyUF2 Bootloader](https://learn.adafruit.com/adafruit-magtag/update-tinyuf2-bootloader-for-circuitpython-10-4mb-boards-only) before following these steps for the UF2 bootloader! ## 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. ![adafruit_products_IMG_0169.jpg](https://cdn-learn.adafruit.com/assets/assets/000/097/429/medium640/adafruit_products_IMG_0169.jpg?1607200225) 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. ![adafruit_products_MagTag_pinouts_Reset_and_Boot0.jpg](https://cdn-learn.adafruit.com/assets/assets/000/097/430/medium640/adafruit_products_MagTag_pinouts_Reset_and_Boot0.jpg?1607202717) If the UF2 bootloader is installed, you will see a new disk drive appear called **MAGTAGBOOT** ![adafruit_products_image.png](https://cdn-learn.adafruit.com/assets/assets/000/097/431/medium640/adafruit_products_image.png?1607202820) Copy the **UF2** file you downloaded at the first step of this tutorial onto the **MAGTAGBOOT** drive ![adafruit_products_image.png](https://cdn-learn.adafruit.com/assets/assets/000/097/432/medium640/adafruit_products_image.png?1607202977) 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)](https://learn.adafruit.com/adafruit-magtag/install-uf2-bootloader) 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. ![adafruit_products_image.png](https://cdn-learn.adafruit.com/assets/assets/000/097/433/medium640/adafruit_products_image.png?1607203475) # 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](https://learn.adafruit.com/adafruit-magtag/rom-bootloader#run-esptool-and-check-connection-3076823-5) 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. ![adafruit_products_Metro_ESP32_S2_binary_install.png](https://cdn-learn.adafruit.com/assets/assets/000/096/950/medium640/adafruit_products_Metro_ESP32_S2_binary_install.png?1605031120) Press reset to exit the bootloader. Your **CIRCUITPY** drive should appear! You're all set! Go to the next pages. ![adafruit_products_Metro_ESP32_S2_CIRCUITPY.png](https://cdn-learn.adafruit.com/assets/assets/000/096/951/medium640/adafruit_products_Metro_ESP32_S2_CIRCUITPY.png?1605031168) # 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](https://learn.adafruit.com/adafruit-magtag/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. # MagTag Tides Viewer ## CircuitPython Internet Test One of the great things about most Espressif microcontrollers are their 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 (it will error until WiFi details are added). Click the **Download Project Bundle** button 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. https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/ESP32_S2_WiFi_Tests/CPy_Native_WiFi_Test/code.py Your **CIRCUITPY** drive should resemble the following. ![CIRCUITPY](https://adafruit.github.io/Adafruit_Learning_System_Guides/ESP32_S2_WiFi_Tests_CPy_Native_WiFi_Test.png ) 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. https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/ESP32_S2_WiFi_Tests/CPy_Native_WiFi_Test/settings.toml 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](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. Warning: If you connect to the serial console, you should see something like the following: ![](https://cdn-learn.adafruit.com/assets/assets/000/097/014/medium800/adafruit_products_1__screen__Users_brentrubell__screen_.png?1605218222) In order, the example code... Checks the ESP32's MAC address. ```python 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. ```python 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. ```python 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. ```python 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](http://docs.python-requests.org/en/master/) interface - which makes getting data from the internet _really really easy._ ```python 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 http **s** url for SSL connectivity.  ```python 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`.  ```python 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. ```python 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](https://en.wikipedia.org/wiki/IPv6_address#Local_addresses). If you're interested in global IPv6 connectivity you can use services like [Hurricane Electric](https://www.he.net/) 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: ```python 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: ```python >>> 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: ```python >>> 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: ```python >>> 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: ```python >>> 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') ``` # MagTag Tides Viewer ## NOAA Tides Web Service We will use a web service provided by the National Oceanic and Atmospheric Administration ([NOAA](https://www.noaa.gov/)) to get our tide information. One benefit of this is that no API key is needed, since it's your tax dollars at work. However, since this is a part of the US government, the service only covers regions of the United States. If you live outside the United States, you may have to find a service which sends out tide data as a JSON feed and adapt the code to your new data source. The framework laid out here should provide you a great starting point. ## NOAA CO-OPS API Wow, acronyms! We already covered NOAA above. [CO-OPS](https://tidesandcurrents.noaa.gov/about_us.html) stands for Center for Operational Oceanographic Products and Services. Why is there a dash? Don't know, it's just what the government does. But also, it doesn't really matter. If you want to know more, [read about it here](https://tidesandcurrents.noaa.gov/about_us.html). API stands for Application Programming Interface, a general term used a lot in programming. The CO-OPS API is one of many web services that NOAA provides. [There's a complete list here](https://tidesandcurrents.noaa.gov/web_services_info.html). The main documentation for the web service we will use is here: [ CO-OPS API For Data Retrieval](https://tidesandcurrents.noaa.gov/api/) There are a lot of options and types of data that can be returned. We've worked out the magic invocation needed for the PyPortal and you can find it in the code later. The only item you will need to worry about is finding your closest tide monitoring station ID. This is how you will set your location in the code. So let's see how you can figure that out next. ## Find Your Tide Station ID To find you station ID, start by going to this webpage: [Tides and Currents Map](https://tidesandcurrents.noaa.gov/) Scroll down a bit and you'll see a map. You can simply click on the state of interest. Note that some states are not clickable. That's because they don't have tides :( ![](https://cdn-learn.adafruit.com/assets/assets/000/074/453/medium800/circuitpython_Screenshot_from_2019-04-14_15-32-44.png?1555281231) Once you've clicked on a state you'll get a familiar map like interface that you can drag and zoom around. Use that to zoom in and find the station marker that seems like it will work best for your location. ![](https://cdn-learn.adafruit.com/assets/assets/000/074/454/medium800/circuitpython_Screenshot_from_2019-04-14_15-33-21.png?1555281301) Click on the marker and it will bring up information about that marker. ![](https://cdn-learn.adafruit.com/assets/assets/000/074/455/medium800/circuitpython_Screenshot_from_2019-04-14_15-33-33.png?1555281319) The station ID will be the number shown near the top. This is what you will enter into your code. ![](https://cdn-learn.adafruit.com/assets/assets/000/074/456/medium800/circuitpython_station_id.jpg?1555281402) ## Basic Tide Time Info Here's the URL that gets the high and low times for the current day at the station location. The station ID is the very last thing in the URL, so you can change it for your location if you want. ```auto https://tidesandcurrents.noaa.gov/api/datagetter?date=today&product=predictions&datum=mllw&interval=hilo&format=json&units=metric&time_zone=lst_ldt&station=9447130 ``` If you put that address in your web browser you'll get something that looks like this: ![](https://cdn-learn.adafruit.com/assets/assets/000/074/509/medium800/circuitpython_Untitled.png?1555419984) Not a very pretty web page. That's because it's just JSON data. The key **predictions** is the root for all the data. Then there are several entries that look like: ```auto {"t":"2019-04-15 02:55", "v":"3.401", "type":"H"} ``` The **t** entry gives us the date and time, the **v** entry gives us the tide level, and the **type** is **H** for high tide or **L** for low tide. So we have what we need - the time for each of the high and low tides for the given day. You'll see how this is parsed out later in the code. ## **Tide Levels Throughout the Day** With a slight modification of the URL, we can get predicted water levels in 6 minute increments over the period of the current day. Here's the URL for that: ```auto https://tidesandcurrents.noaa.gov/api/datagetter?date=today&product=predictions&datum=mllw&format=json&units=metric&time_zone=lst_ldt&station=9447130 ``` ![](https://cdn-learn.adafruit.com/assets/assets/000/074/476/medium800/circuitpython_Screenshot_from_2019-04-14_20-24-11.png?1555298661) More data like before, but now much more of it! With data every 6 minutes, that's 10 per hour, or 240 for the entire day. And now each entry contains simply **t** and **v**. So for the given time **t** , we get the predicted water level **v**. We can use that to make a neat little plot of water level vs. time for the day. This will give us a graphical representation of the tidal activity. # MagTag Tides Viewer ## Tide Viewer Code ## Installing 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\_Tides/** 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: ![CIRCUITPY](https://adafruit.github.io/Adafruit_Learning_System_Guides/MagTag_MagTag_Tides.png ) https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/main/MagTag/MagTag_Tides/code.py ## Tide Information Display Once the code runs, the MagTag display should update to show the information below. ![](https://cdn-learn.adafruit.com/assets/assets/000/097/409/medium800/wireless_disp_info.jpg?1607035863) # MagTag Tides Viewer ## Customizing ## Simple Stuff At the top of the code there is a section with some user changeable settings. It looks like this: ```python # --| USER CONFIG |-------------------------- STATION_ID = ( "9447130" # tide location, find yours here: https://tidesandcurrents.noaa.gov/ ) METRIC = False # set to True for metric units VSCALE = 2 # pixels per ft or m DAILY_UPDATE_HOUR = 3 # 24 hour format # ------------------------------------------- ``` The most important is `STATION_ID`, which sets the location. If you want the plot to use meters instead of feet, you can set `METRIC` to `True`. The plot does not auto adjust the scale, so if you find plot data getting squished or going off the grid, you can change `VSCALE` as needed. And finally, `DAILY_UPDATE_HOUR` is the hour in 24 hour format at which time the tide information and display are updated. ## Not So Simple Stuff The plot grid and banner behind the date label were created as a bitmap image. This is then loaded and added in with the other various graphical elements. So to actually change either of those, you would need to alter the source bitmap. Here is the SVG file used to create the bitmap. [magtag_land.svg](https://cdn-learn.adafruit.com/assets/assets/000/097/412/original/magtag_land.svg?1607104121) There were some additional refinements done using image editor software (gimp) after exporting the SVG to a PNG. Then the PNG was converted to a BMP for use in CircuitPython. If you want to alter this graphic, starting with the SVG file is the best way. ## Featured Products ### Adafruit MagTag - 2.9" Grayscale E-Ink WiFi Display [Adafruit MagTag - 2.9" Grayscale E-Ink WiFi Display](https://www.adafruit.com/product/4800) The Adafruit MagTag combines the 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 is removed! The ESP32-S2 is great because it builds on the years of code and support for the ESP32 and also adds... 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In Stock [Buy Now](https://www.adafruit.com/product/4819) [Related Guides to the Product](https://learn.adafruit.com/products/4819/guides) ## Related Guides - [Adafruit MagTag](https://learn.adafruit.com/adafruit-magtag.md) - [MagTag Dishwasher Status](https://learn.adafruit.com/magtag-dishwasher-status.md) - [SpaceX Next Launch Display with Adafruit MagTag](https://learn.adafruit.com/spacex-next-launch-display-with-adafruit-magtag.md) - [ePaper Camera](https://learn.adafruit.com/epaper-camera.md) - [CircuitPython Display_Text Library](https://learn.adafruit.com/circuitpython-display-text-library.md) - [NextBus Transit Predictions for Adafruit MagTag](https://learn.adafruit.com/nextbus-transit-predictions-for-adafruit-magtag.md) - [Cheerlights Holiday Wreath with Animations](https://learn.adafruit.com/cheerlights-led-animations.md) - [MagTag Weekly Showtimes Event Notifier](https://learn.adafruit.com/magtag-weekly-event-showtimes-display.md) - [MagTag Cat Fed Clock](https://learn.adafruit.com/magtag-cat-feeder-clock.md) - [MagTag Daily Weather Forecast Display](https://learn.adafruit.com/magtag-weather.md) - [MagTag AR Tarot Card Reading](https://learn.adafruit.com/magtag-tarot-cards.md) - [MagTag James Webb Telescope Status](https://learn.adafruit.com/magtag-james-webb-telescope-status.md) - [Language Flashcards on the MagTag](https://learn.adafruit.com/magtag-flashcards.md) - [Adafruit MagTag Kitchen Timer](https://learn.adafruit.com/adafruit-magtag-kitchen-timer.md) - [AdaBox 017](https://learn.adafruit.com/adabox017.md) - [MagTag 3D Printed Stand Case](https://learn.adafruit.com/magtag-3d-printed-stand-case.md)