PWM pins are generally used in controlling output devices in Arduino projects.To send a PWM value to a PWM-capable pin like the Mega's D9, the easiest and most common way is by using the ...

[Trent M. Wyatt]’s CPUVolt library provides a fast way to measure voltage using no external components, and no I/O pin. It only applies to certain microcontrollers, but he provides example Ar… ...