Arduino Shields are add-on boards for Arduino Boards to allow for additional functionality.
This is an easy to use library to add RTC to an Arduino. http://www.rinkydinkelectronics.com/library.php?id=73
HC-SR04 Ultrasonic Distance Sensors allow you to take relatively accurate distance readings for your Arduino project. Functional Parts in the Project: Arduino Uno – https://store.arduino.cc/usa/arduino-uno-rev3 HC-SR204 Ultrasonic Sensor – https://amzn.to/31AGgYC Breadboard Kit – https://amzn.to/2Xih5ei