Adafruit PyRuler - Engineer Reference Ruler with CircuitPython POL_6V High-Power (HP) Micro Metal Gearmotors All other GPIOs are unused

All other GPIOs are unused and you can still share the I2C pins with sensors

Grove - Sunlight Sensor includes an on-bard Grove connector

Many "cheap" DS3231 RTC boards do not use genuine Maxim DS3231's - you'll get a non-calibrated RTC which does not maintain the timekeeping quality that is specified

so the Arduino's traditional wired USB connection can still be used while the shield is connected

by the way

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