But even after eliminating the Uno from your selection, you'll still be left with a wide array of Arduino boards to choose ... The Micro measures 48 mm in length and 18 mm in width and weighs ...

His offering uses the Arduino Uno, but there are several other hardware options covered as well. The firmware makes use of the serprog-duino library which was crafted at writing to flash memory chips.

The 16u2 is normally used as the Arduino Uno’s USB interface ... cassette and speaker interface accurate loops to generate and measure frequencies. One of the trade-offs [Damian] accepted ...