Microcontroller demo boards such as the Arduino UNO are ubiquitous on Hackaday ... His notes show he saw the barest way to operate an ATMega328, built it, tested, and moved on to the power supply ...

However, with [jakeofalltrades’] project, you can read an old-fashioned phone dial using an Arduino. The idea behind ... has some good examples of using ATmega328 timers that you might find ...