I just finished making a clock for my work area using a 7 segment display,RTC (real time clock) and the RTC library. The nice thing about using this RTC is that it has a backup battery so if you lose power, it still maintains the time.
Fairly easy setup. Both the RTC and the 7 segment display use 12c to communicate with the Arduino. Because they have different addresses this is ok. Adafruit has this handy chart of a lot of sensors and things and what their addresses are. The 7 segment display I used has an address of 0×70 and that is not yet on the chart, but can be found in the library RTClib.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.