Second optoisolator on MS2
#64
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I'm upgrading a MS2 to MS3, decided to add the second opto just as a precaution, although this has been running fine on ms2 since 2008 with just the pull-up on js10.
![](https://www.miataturbo.net/attachments/megasquirt-18/73460-second-optoisolator-ms2-dsc_6196.jpg?dateline=1365897525)
Last edited by Braineack; 04-14-2013 at 11:12 AM.
#65
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I made a slight error when I built the circuit. I used the wrong hole for r49 so I was sending 5v to ground. I'll post new pics in a sec.
here's what I did:
![](https://www.miataturbo.net/attachments/megasquirt-18/73498-second-optoisolator-ms2-dsc_6201.jpg?dateline=1365953675)
syncs perfectly.
here's what I did:
![](https://www.miataturbo.net/attachments/megasquirt-18/73498-second-optoisolator-ms2-dsc_6201.jpg?dateline=1365953675)
syncs perfectly.
Last edited by Braineack; 04-14-2013 at 11:34 AM.
#68
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It was because of you I tried doing it into a preexisting circuit, otherwise I'd have just done it on the proto.
I probably spent a good 2 minutes coming up with it and going gung-ho, I probably could have put more thought into it and made it cleaner, but i just didn't really care that much
I probably spent a good 2 minutes coming up with it and going gung-ho, I probably could have put more thought into it and made it cleaner, but i just didn't really care that much
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Last edited by Braineack; 04-15-2013 at 04:38 PM.
#70
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I used one of these: Dual General-Purpose IC PC Board : PC Boards | RadioShack.com cut in half, and bolted it on to the bottom of the MS board using a previously unused hole in the heatsink.
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The problem is I am running DIYPNP V1.53B board, so these pins don't apply to me. I couldn't find the schematic for the V1.53B board so its pretty hard to see what is going on. I read somewhere the cam signal is fed directly to the CPU with only pull a 5 volt pullup.
So, I am going to build this on the proto area completely. From what I read so far, I should be able to use this circuit and feed it into the VR2+ the cam input without the pullup to 5V attached to VR2+.
For your convenience. Here is the pin out for DIYPNP board for 95 miata which is what Im driving.
DIYPNP MegaSquirt installation for the Mazda Miata