LT1 Optispark, board wiring quick question

[Thirim]

I'm new to Megasquirt, I built mine from scratch a couple years ago and never used it. The time has come!
I was originally going to go MS1 and EDIS but have purchased MS3/MS3x cards and harness and plan to go that route. Initially I'm going to go with the optispark in stock form and perhaps later step it up.

First, I check the MS3X hardware manual and it says to follow 5.2.3 for setup... DIYAUTOTUNE's install article says jump TSEL to VROUTINV .. 5.2.3 says TSEL to VR OUT. Who's right?
Second, Do I need the 1K resistor as per 5.2.3 installed in the proto area? diyautotune didn't mention this.
Third, I've installed the BIP373.

Attached is a couple snaps of the board as I've assembled. Anyone see anything glaringly wrong? <--- guess I can't attach pictures yet.

I appreciate the help. It's a little nerve wracking to build your own board from scratch (probably not my smartest decision) and then struggle to adapt it to work when you're not entirely sure what you're doing in the first place lol.
I am learning a lot though, lots of good advice on here.

Thanks

[Thirim]

PCB pics.
Thanks

[242ATL]

It looks like the mods posted in the picture above are for MS2 instead of MS3?

I couldn't get my ms3 lt1 to run unless I used DIY's MS3 setup instructions.

[jsmcortina]

I couldn't get my ms3 lt1 to run unless I used DIY's MS3 setup instructions.

How are those different to the instructions in the manual?

James

[242ATL]

I couldn't get my ms3 lt1 to run unless I used DIY's MS3 setup instructions.

How are those different to the instructions in the manual?

James

From the megasquirt manual

5.2.8 Optical sensor
The optical sensor is another commonly used category of sensor. These are almost exclusively a three wire
sensor. In CAS (crank angle sensor) units a multi-plug may be used to combine multiple sensors. The sensor
itself acts like a switch to ground when light shines through the trigger disc. Optical sensors are commonly seen
in distributors where vanes or shutters block the light causing the sensor to rapidly switch off and back on when
light is present again. A pull-up resistor is almost certainly required.
See section 5.2.3 for wiring.

5.2.3 Hall sensor input
VR Input with pullup for hall sensors, LS2/58X, optical sensors or points
a) Solder a link between VRIN and TACHSELECT
b) Solder a wire between VrOUT and TSEL
c) Install a 1k resistor (any value 470R - 2k2 is likely OK) in the proto area. Connect one end to the 5V hole and
join the other end to VRIN with a jumper wire.

DIY's instructions.

In step 22, install the stepper IAC jumpers (all of our assembled MS3 units are by default configured this way).
Build the ECU up to trigger for inverted VR output. On a V3.0, wire TachSelect to VRIN and TSEL to VROUTINV. On a V3.57, put main board JP1 in the 1-2 position and J1 in the 5-6 position.
That's it!

Am I reading it wrong?

[jsmcortina]

In the manual it says to use the regular VRout wiring (so it is the same as every other install and...

Flip polarity on hi-res should be set to "Inverted"

James

[242ATL]

In the manual it says to use the regular VRout wiring (so it is the same as every other install and...

Flip polarity on hi-res should be set to "Inverted"

James

I don't find where it says to use regular VRout wiring in the optispark instructions.

Not being and electrical engineer, I don't understand how "Flip polarity on hi-res should be set to "Inverted" " translates into a choice between VrOUT and TSEL vs. TSEL to VROUTINV. Especially for someone soldering up a board and trying to hook it up to their car.

[jsmcortina]

In the manual it says to use the regular VRout wiring (so it is the same as every other install and...

Flip polarity on hi-res should be set to "Inverted"

James

I don't find where it says to use regular VRout wiring in the optispark instructions.

It says to wire the input per section 5.2.4 - the VRout is covered there.

Not being and electrical engineer, I don't understand how "Flip polarity on hi-res should be set to "Inverted" " translates into a choice between VrOUT and TSEL vs. TSEL to VROUTINV. Especially for someone soldering up a board and trying to hook it up to their car.

If you follow the instructions for wiring and settings it should work.
The Nissan CASes work the same way and I've built and tested a few Megasquirts for those combinations recently.

James

[Thirim]

Sorry guys, I appreciate the help and I've missed the replies.
I've made some progress. I've decided that since I own the MS3/3x that I'll go seq spark using LS1 or LS7 coils. (haven't sourced them yet).
I'm still stuck bench testing the Optispark though.
I have it wired as per 5.2.4 and per 6.39
I have the Jimstim connected and the MS3X cable.
I have the Hi-Res signal connected to PT4 on the MS3X cable and the Low Res signal from the Optispark connected to "TACH" on the the screwdown connector on the JimStim.
I also have the appropriate wire from TPS VREF (5V on the screwdown connector of the jimstim just below the 12V) connected per 6.39 with 330ohm resisters.
Should I not begetting something on tunerstudio when I spin the opti by hand or with a cordless drill?

[Thirim]

YAY!!!

Ok I followed 5.2.4 to the letter and verified the 2.5V at R54
I followed 6.39 to the letter
I set Tunerstudio per 6.39

I ran my drill in reverse, and voila!! RPM synced!

Next chore I guess is to figure out the coils.

Thanks James for the clarifications between the manual and DIYAutotune. I think both are the same end result but since you insisted you did a few of these per the manual then I followed the manual to the letter.