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* First pass at biweekly and other repeating alarms. Removed code related to a now-abandoned start on that feature. Minor AQI tweaks.
* Fix repeat data calculations and some dialog layout/display issues.
* Get versioning and CHANGELOG.md ready for new alarm features.
* More alarm work.
* Documentation updates for new alarm features.
Copy file name to clipboardExpand all lines: README.md
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## Astronomy/Weather Clock
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This project is designed to create a desktop clock that provides weather and astronomical information while additionally functioning as an alarm clock.
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On a display which is narrower than a 16-by-9 aspect ratio, four forecast days can be seen at one time without scrolling. On 16-by-9 or wider displays, five days are visible at a glance.
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Multiple alarms can be set as either daily alarms (on selectable days of the week), or one-time alarms triggered at a specific date and time. Various alarms tones are available, and each alarm can be accompanied by an on-screen message. Alarms can be set to snooze for 5, 10, or 15 minutes.
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Multiple alarms can be set as daily alarms (on selectable days of the week), or as alarms triggered on a specific date and time, these either going off once, or at repeating intervals starting with the given date. Various alarms tones are available, and each alarm can be accompanied by an on-screen message. Alarms can be set to snooze for 5, 10, or 15 minutes.
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When viewing the sky map feature you can choose to see a multicolor sky, shaded to indicate daylight, sunrise and sunset, twilight, and even solar eclipse conditions. Or the sky can be shown as black all the time for easier viewing of the positions of the stars. Constellation lines can be optionally displayed as well.
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**A touchscreen or mouse is required to display the last two or three days of the seven-day forecast, to switch the display from sunrise/sunset to moonrise/moonset, from clock face to sky map, or to switch from hourly temperatures to hourly probability-of-precipitation.*
You can be pickier than this about autoplay privileges, narrowing the autoplay permission to localhost, but this is the easiest way to ensure audio playback.
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By default, this application uses GPS-synced system time, if available, or uses a default pool of NTP time servers (keeping its own time via NTP, rather than using the system clock). You can configure the use of different time servers, however, you should not choose Google or Facebook time servers, or any other NTP server that implements “leap second smearing”, if you want the Astronomy/Weather Clock to be able to accurately display leap seconds as shown below:
*This image is hypothetical — the pictured moment in time was not an actual leap second. Video here: <https://shetline.com/video/leap_second_display.mp4>*
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For the US AQI system, you can use an alternative color coding system that gradually changes shade as the air quality transitions from one level to the next. As can be seen below, the just-on-the-border rating between “Good” and “Moderate” at an AQI of 51, rather than starkly switch from green to yellow, can be shown as greenish yellow instead.
As soon as you’ve got the Astronomy/Weather Clock up and running the first time, you might want to click on the gear icon in the lower right corner of the web browser display to adjust the various user options which aren’t queried as part of the initial set-up.
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Your city might be filled in automatically by using your IP address — but then again, it might not. If you’re using this clock in a bedroom you might find the **Dimming** options very useful, as they establish a schedule during which the display will be reduced in brightness.
Using Chromium, you can close the web browser while it’s running in full-screen kiosk mode by pressing `Alt-F4`, or use the Settings/Quit button if available. To get out of full screen mode, but leave the browser running, press `Alt-F11`.
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**This default was GPIO 4 (physical pin 7) before version 2.4.0, but the Adafruit GPS HAT is pre-wired to use that pin, hence the new default.*
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Also for the Raspberry Pi you have the option to provide wireless indoor conditions and outdoor weather data using [433 MHz Acu Rite 06002M wireless temperature and humidity sensors](https://www.amazon.com/gp/product/B00T0K8NXC/) paired with a [433 MHz receiver module](https://www.amazon.com/D-FLIFE-Wireless-Transmitter-Receiver-Antenna/dp/B0BZRRBBNK/).
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Ever wake up before your alarm goes off, don’t want to worry about the alarm going off when you aren’t around, but you’re also worried that if you turn the alarm off you’ll forget to turn it back on again for when you need it next?
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Wind speed is displayed using *wind barbs*. When using imperial units, the wind barbs represent wind speed in knots, rounded to the nearest multiple of 5 knots, up to a maximum of 100 knots. In metric mode the wind barbs, by default, represent wind speed in meters per second, in increments of 2.5 m/s (in the diagram above, divide the captions by 2 for m/s).
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The 3D model for this stand is provided by the project file `raspberry_pi_setup/monitor_stand.stl`. Below is how that model came out when printed using black ABS, 20% infill, at a cost of about $28 USD.
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This is my second design of this stand, after making a few improvements from my first design. I made this version shorter, improved wire routing, and added an access hole where (using tweezers) it’s possible to access the SD card slot without disassembling the clock.
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#### Front view
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#### Side mounting panel
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The side panel has a place to attach a quarter-wave 433 MHz antenna, a clip to hold a 433 MHz receiving module, a hole for a female SMA coaxial connector for GPS, and (on the reverse side) a mounting position for a DHT22/AM2302 temperature/humidity sensor.
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#### Original monitor stand
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This is the original stand that came with the 2560x1600 ELECROW 10.1" touchscreen monitor. It’s not a bad stand in general, but, with the Raspberry Pi attached to the back of the monitor, the cables and wires were an awkward fit. The stand had to be skewed off-center quite a bit for it to work at all.
The stand is attached using 4 M3 x 10 mm wafer-head machine screws. Please note that M4 is the typical size screw for a VESA mount of this size (75 mm square spacing), so it’s a little unusual M3s were needed instead.
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#### Stand attached to monitor, side view
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A small piece of non-conductive foam wedged behind the RF module helps keep the module in place.
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#### Raspberry Pi Model 4 attached to stand-offs
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I was a bit uncertain how well machine screws would work with the stand-offs that I’d designed, since I wanted them to function like self-tapping screws. As it turned out, the four M2.5 x 6 mm pan-head machine screws fit quite nicely and snugly, without being difficult to turn. If the Pi were to be repeatedly removed and reattached, however, this design might not be durable enough. For my current purposes, it’s just fine.
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#### GPS HAT added, and components wired together
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While this would actually be a good thing if it meant I could hook up the clock with only one power cable, not two, the power from the monitor only keeps the Raspberry Pi running *after* the Pi has been separately powered up using its own power supply. The result is no simplification of the power connections, but merely making it harder to shut the clock down without adding this power isolating adapter.
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When using a small but high resolution display like the 2560x1600 ELECROW 10.1" monitor I chose to use, which is nearly 300 ppi (~120 pixels per cm) you’ll typically want to apply a scaling/zooming factor to the display, otherwise text and other details will be impractically small to see. With earlier releases of Raspbian this kind of scaling would be done using the pixel doubling option below:
With later versions of Raspbian all you need to do is set a lower display resolution than the native resolution of your display to get sharp but smooth text instead of very tiny text.
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