I wanted to get the thud from the contractors at exactly the same moment I press the flipper switches. Even though many people do it through the LedWiz, there is a very slight delay- and it annoyed me as it makes it feel less real. Think about it - if the flipper switches are wired to the Ipac which has to process and send a message through VP, which itself has to process the signal, and then send back a message to the LedWiz (which for me saw a delay of at least 2-3ms) and then back to the Contactors, there is a very slight (but noticeable to me at least) delay between pressing the flipper switch and feeling the contactors.
The optocouplers allows me to press the flipper switch which is wired (at 12V) directly to the contactors. The IPac can only have a 5V signal going into it and needs to be electrically separated from the contactor circuit and the Optocouplers allows me to do that. The circuit diagram is in my write up.
So IMO, there is zero delay using optocouplers. One other advantage is that you save two ports on the LEDWiz, plus flipper presses driving contactors puts quite a lot of strain on the LedWiz as they happen all the time. So it may also lengthen the life of the LedWiz.
P17 of the electrical guide shows the optocoupler method. I personally think its best, but I'm interested to hear what other people think.
The LED on page 19- I originally had it there as a test to show that the optocoupler is getting a signal. I never bothered removing it.
Edited by kenrunio, 07 October 2013 - 06:40 PM.