Nuacht

to convert 12v ~ 5v R1 = 13kOm R2 = 20kOm || constant for arduino nano : KF 0.00488758553 ; error 0.021 ; ...
Arduino board requires a USB cable connected to a laptop/PC or an external AC/DC adaptor for power supply. If you want a portable Arduino-based project, you need a battery for power supply. 9V PP3 is ...