This project was a project designed specifically because I did not have a timer on hand. To use this project you simply just upload the code to your arduino (any type will work) you will just need upload the code to the arduino and the countdown will automatically start. Should you want to change the total time you will need to change this part of code. REMEMBER!!! 1000= 1 sec. so 60000 = sec 60 or the equation (SECx1000) will give you your total number to insert into the place of the 60000. Finally when you press the reset button the counter automatically restarts.
long n = 60000; //start time -> CAN CHANGE TO WHATEVER TIME YOU WANT