The Proximity-Based Countdown Timer is intended to be used for the detection of an object leaving a designated spot. The timer is designed to be portable. It is battery powered to enable it to be portable. The timer is also designed to have a 440 Hz +/- 1 Hz sound play at an adjustable volume level. The sound plays in a range of 45 to 72 dBa with an error of +/- 8 dBa. This sound is rated for a measurement 6 inches away from the speaker on the timer. The volume is controlled by a potentiometer. The timer also has a few other user inputs; a button that control the time on the timer; the on/off power switch; and a button for the brightness level, which allows selection between 3 different brightness levels. We were able to make these engineering design requirements work along with the rest of the system which is an accomplishment in itself. We did have some challenges that we had to overcome. How we separated our project into blocks was not ideal. We ran into weird overlaps that made the project more complex than necessary. This was caused partially by our inclusion of an user input block. It has several intermediate components that would normally fit fine between two blocks but because of how we classified them, it didn’t work as well.