Then, an Arduino board might be ... it's still slightly cheaper than the R3 at $27.50. One of the most significant differences between the classic Rev3 and Uno's more recent iteration, the R4 ...

and an Arduino Uno R3 with an ATmega328P. To do that, he took a bench PSU, added a filter circuit to it, went through the entire ADC range for each board, took a large number of samples at ...