Wall Clock/Timer

[last updated: 2022-12-16]
RTC module
7-segment display w/ backpack module
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• Hardware:
• Arduino Nano
• RTC - PCF8523 - Adafruit: 3295 breakout
• 4-digit 7-segment LED display with i2c backpack - Adafruit: 878
• Circuit board


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• Programming:
  • Starting from: example program from: Adafruit LED Backpack Library > clock_sevenseg_ds1307 ... edited to use the PCF8523 RTC; and example program from: RTClib > pcf8523
  • Also see notes about needed libraries in RTC and 7-segment backpack pages, linked above.
  • Current Program: clockTimer-12

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• later...
  • add speaker
  • add LiPo battery and charger
  • convert to more accurate, lower drift, RTC

  • synch time with internet via wifi
    https://forum.arduino.cc/t/how-to-make-arduino-sync-time-from-internet/5...
    https://lastminuteengineers.com/esp8266-ntp-server-date-time-tutorial/
    https://www.instructables.com/Arduino-Internet-Time-Client/
    https://randomnerdtutorials.com/esp32-ntp-client-date-time-arduino-ide/
    https://www.instructables.com/Getting-Time-From-Internet-Using-ESP8266-N...
    https://www.circuitbasics.com/using-an-arduino-ethernet-shield-for-timek...
    https://randomnerdtutorials.com/esp32-date-time-ntp-client-server-arduino/
    https://insights.sei.cmu.edu/blog/best-practices-for-ntp-services/
    https://www.cyberciti.biz/faq/linux-unix-bsd-is-ntp-client-working/

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