Hi all, i want to hook my Uno to the RS 232 output of a vending machine. on wikipedia i read that output levels of RS 232 are typically +-5V, 10V and 15V. The maximum input of Arduino is 5.5V so i probably need to lower this voltage. How do i do this? Thank you

Will this fry my Uno?

dieselboris October 8, 2012, 2:56pm 3

Ok, will look into this,

thanks!