PWM pins work the same way across all Arduino boards, so you don't need to go out of your way to buy a Mega if you already have a board supporting PWM. On the Uno, Nano, and Mini, the PWM pins are ...

This tutorial will guide you through the process of building a tachometer around an Arduino. Tachometers are used to measure rotation rate in Revolutions Per Minute (RPM). You don’t need much… ...

And that involves setting pins to ‘interrupt-on-change’ and getting the chip to ‘wake-on-interrupt’ – all stuff I could have done in assembler, but how to do in Arduino-speak. Big Dan rides to the ...