MicroSquirt.com read only forum (Jan.15,2018)

I'm using a 5v signal from an optical sensor as an input to my uS, but I've recently had problems trying to pick up a signal on VR2. I can successfully pick up the signal on optin 1, but not vr2. I decided to check the signal to the cpu using tooth analyzer and verified that the signal is being seen when I use optin1, but not vr2. It was then that I noticed that when I disconnect vr2, it has +3.5 volts compared to ground. My VR1 has a +2 volts compared to the sheild on VR1. Is this normal? If not, what can I do to fix it?

Is this a V3.0 or an earlier MicroSquirt?

This is 2.0 version of microsquirt with black board.

Is this signal purely 5 volts, or does it get pulled to ground? If it's from 5 volts to floating, you'll want to run it through a transistor with a 5 volt pull up.