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https://github.com/obono/arduinoperpetialcalendar
A perpetial calendar by Arduino Nano with a screen.
https://github.com/obono/arduinoperpetialcalendar
adafruit-gfx arduino electronics rtc st7735
Last synced: 13 days ago
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A perpetial calendar by Arduino Nano with a screen.
- Host: GitHub
- URL: https://github.com/obono/arduinoperpetialcalendar
- Owner: obono
- License: mit
- Created: 2020-01-24T13:37:41.000Z (almost 5 years ago)
- Default Branch: master
- Last Pushed: 2024-01-27T09:13:04.000Z (11 months ago)
- Last Synced: 2024-01-27T11:55:34.020Z (11 months ago)
- Topics: adafruit-gfx, arduino, electronics, rtc, st7735
- Language: C++
- Homepage:
- Size: 214 KB
- Stars: 0
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Arduino Perpetial Calendar
## Description
A perpetial calendar by Arduino Nano.
The current date, the current time, and the calendar of the current month is displayed usually. Holidays follow the Japanese calendar rules.
The month of the displayed calendar is changed by pressing + or -. After several seconds, it reverts to the current automatically.
To adjust the date and time, the focus appears by pressing SET and the focused value can be changed by pressing + or -.
## Hardware
### Components
* [Arduino Nano](https://store.arduino.cc/usa/arduino-nano) (or compatible product)
* 128×128 full color display using ST7735S driver [(example)](https://www.tindie.com/products/joylife/144-128x128-full-color-tft-lcd-display-module/)
* 3 tactile switches
* Wires, connectors, a prototyping board, etc...
### Circuit diagram
## Software 
### Build and transfer
Clone the source code and open "ArduinoPerpetialCalendar.ino" with Arduino IDE.
This sketch depends on following libraries. (You can add these by library manager)
* [Adafruit GFX Library](https://github.com/adafruit/Adafruit-GFX-Library)
* [Adafruit ST7735 and ST7789 Library](https://github.com/adafruit/Adafruit-ST7735-Library)
You can build the source code with following configuration.
* Board: "Arduino Nano"
* Processor: "ATmega328P (Old Bootloader)"
Then, you can transfer binary data to Arduino Nano by usual way.
### Tuning waiting time
This program calls `delay()` function to loop 20 times each second, but actually it's low accuracy because of an individual difference in the hardware.
You should edit `US_PER_FRAME` and `US_PER_FRAME_256TH` in ["ArduinoPerpetialCalendar.ino"](ArduinoPerpetialCalendar.ino#L24-L25) to tune to loop in actual 50 milliseconds exactly.
```
#define US_PER_FRAME 49978UL
#define US_PER_FRAME_256TH 86
```
`US_PER_FRAME_256TH` is for 1/256 microseconds, so it's 49978.3359375 microseconds in the above case. This is suitable for my Arduino Nano.
### Customize memorial days
Edit `memorialTable[]` in ["SpecialDate.h"](SpecialDate.h#L35-L47) to add your memorial days.
```diff
PROGMEM static const int memorialTable[] = {
+ SPECIAL_DATE(1, 16), // My birthday
SPECIAL_DATE(2, 3),
SPECIAL_DATE(2, 14),
SPECIAL_DATE(3, 3),
```
You must use `SPECIAL_DATE` macro. Basically, its arguments are the month and the day.
`SPDAT_XXXn` constants are defined to specify the somethingth day of the week. (For example, `SPDAY_WED2` means the 2nd Wednesday.)
### License
These codes are licensed under [MIT License](LICENSE).