On tiny chips without hardware I2C, you can use any two digital pins:
For the DS3231, the library exposes alarm functions that many other libraries bury: virtuabotixrtch arduino library
When logging sensor data every second, you don’t want to parse objects. This code is lean and fast: On tiny chips without hardware I2C, you can
char* daysOfWeek[] = "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"; On tiny chips without hardware I2C