Inkplate 6/10 RTC wake not triggering after first day

TECHNICAL SUPPORT Inkplate
1

Customer:

My Inkplate 6/10 should wake every night at 00:05 sync time and display data, but it does not. When I power the device it wakes only on the next day, nothing after that. I have already replaced the RTC battery and the device is connected to house current. I suspect I may have made a mistake on the RTC/time or UTC conversion handling in the functions syncTimeAndSetRTC or scheduleMidnightFiveAlarm. I am currently running tests with the Inkplate 6 code using my Inkplate 10. I have attached my stripped-down code with English comments and a simple diagram to help visualize the program flow.

Attachment omitted in migration: Inkplate10 diagram.pdf

Attachment omitted in migration: daily wake.ino

Originally submitted via email support on 21 March 2026. Migrated to the forum for community visibility.

2

Soldered Support:

The issue is with the library rather than your sketch. There is an error in the rtcSetEpoch function where the daylight saving flag was never initialized, causing garbage data from the stack to be used instead. This is why it was working unstably. Download the latest library version available on the master branch and try again: GitHub - SolderedElectronics/Inkplate-Arduino-library: Inkplate family Arduino library. The easiest way to add e-paper to your project. · GitHub