Hello, I study electrical engineering on high school and I have been always intersted in electronics etc...
I want to build nixie tube clock controlled by arduino, and my teacher recomended me to use optocoulplers to galvanicaly separate the arduino from the main board because there could potencialy be high voltage powering the nixie tubes. Its summer break here and I cant ask the teacher if I am doing this right, so I decided to ask here.
My wiring is as shown on attached picture. I have optocouplers CNY17 (datasheet:
http://www.farnell.com/datasheets/1795692.pdf ) so I decided to use them.
Pin 1 is attached to digital arduino pin, and the current is limiter by 68R resistor ( I calculated its resistance here:
http://led.linear1.org/1led.wiz)
Pin 2 is arduino ground...
Pin 4 is connected to the ground of a second board driving the nixie tubes
Pin 5 is connected to IC on the second board and its connected via pull-up (pull-down?) resistor to 5 volts.
I think that it will work, but I want to confirm that before I make the pcb.
Thanks for the replies. I hope you will understand my post because my english isnt the best