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 -.
- Arduino Nano (or compatible product)
- 128×128 full color display using ST7735S driver (example)
- 3 tactile switches
- Wires, connectors, a prototyping board, etc...
Clone the source code and open "ArduinoPerpetialCalendar.ino" with Arduino IDE.
This sketch depends on following libraries. (You can add these by library manager)
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.
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" 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.
Edit memorialTable[] in "SpecialDate.h" to add your memorial days.
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.)
These codes are licensed under MIT License.