Each day, millions of people see their productivity plummet as they become distracted by one cell phone app or another. The Cellcatraz Pomodoro Timer offers a solution to this problem by providing a way to control cell phone use and maintain focus on a task. Cellcatraz uses an ATmega328P microcontroller that is pre-programmed via an Arduino UNO. I2C is used to update the 7-segment display, which shows the current time remaining. A photosensor is used to detect whether or not the cell phone is present in the box. Finally, a piezoelectric buzzer is used to generate the alarm tone. Since I had no prior PCB design experience, my initial plan was to use an Arduino UNO with a simple PCB shield. However, I wanted to challenge myself to design a more complex PCB and cut down on component cost, so the final project includes a PCB designed around the ATmega328P. The enclosure was designed to showcase the PCB, but several alterations would make Cellcatraz more practical. For instance, an enclosure with a slot, rather than the current design’s cell phone bay, would accommodate a wider variety of cell phone sizes – or even tablets. Additionally, using surface mounted components would be more space and cost-efficient. Finally, a rechargeable storage battery would allow Cellcatraz to operate without an electrical outlet.