Alarm clock notification and motion sensor

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I am just finishing something like this. It is to help Grandma to remember to take her pills. My led 8x64 display needed a power supply, also 2 push button switches (set time trip, and disable), case , buzzer, power cord, display. I used a nano.
Not sure what you mean by notification tool, I used a buzzer for notification. Three beep and a pause for a minute.

An Arduino Pro Mini and a DS3231 RTC should be okay for this.
Select a display as needed.
Also a few momentary push button switches and an ultrasonic sensor and a case.

Check this thread for construction hints, there are about 550 posts.
https://forum.arduino.cc/index.php?topic=445951.30