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microReticulumTbeam/exercises/06_RTC_check
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John Poole 432f17b2be Modified by ChatGPT for migration to microRecticulum_Firmware, not verified by me... yet, but I am preserving to document this stage.
2026-02-14 10:10:31 -08:00
..
src Modified by ChatGPT for migration to microRecticulum_Firmware, not verified by me... yet, but I am preserving to document this stage. 2026-02-14 10:10:31 -08:00
platformio.ini Modified by ChatGPT for migration to microRecticulum_Firmware, not verified by me... yet, but I am preserving to document this stage. 2026-02-14 10:10:31 -08:00
README.md RTC keeps time between POWER OFF & ON, SD Card at start still needs work -- if card is in the slot, it is not readable until it is pulled on and then inserted. 2026-02-13 18:52:17 -08:00

README.md

Exercise 06: RTC Check (PCF8563)

This exercise validates RTC read/write and power-off persistence on the T-Beam Supreme.

It:

  • Initializes PMU + I2C bus used by RTC.
  • Reads RTC at startup.
  • Prints RTC every 10 seconds.
  • Accepts serial commands:
    • show
    • set YYYY-MM-DD HH:MM:SS
    • help

Build

source /home/jlpoole/rnsenv/bin/activate
pio run -e node_a

Upload

source /home/jlpoole/rnsenv/bin/activate
pio run -e node_a -t upload --upload-port /dev/ttyACM0

Monitor

screen /dev/ttyACM0 115200

Suggested Persistence Test

  1. Set the RTC:
    • set 2026-02-14 17:30:00
  2. Confirm:
    • show
  3. Power off the unit for a few minutes.
  4. Power on and run:
    • show
  5. Compare expected elapsed time vs RTC output.