Mr. Joel Lookadoo, Arkansas's 2020 Teacher of the Year, is doubling as a repairman today. The clock in the schoolhouse is broken, and it's up to him to fix it. Being able to tell time is so important!

You can use a microcontroller to build a clock. After all, a clock is just something that counts the passage of time. The only problem is that microcontrollers can’t track time very accurately. They ...