- Joined Feb 19, 2010
I am building a circuit that would connect inputs between 12 to 24vdc to an arduino mega. I would normally accomplish this using a resister and zener diode. However, using a resister and zener diode will draw too much current because I have about 30 inputs. Each zener needs about 50ma of current draw to keep it in the 5v area. 30 x 50ma 1.5amps. Therefore, I need a circuit that would provide 5v to an arduino input from a 12 to 24 supply with very minimal current draw. Any ideas?