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Basic MS3 - add 5v Ref to DB37?

 
Old 03-17-2018, 04:06 PM
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Default Basic MS3 - add 5v Ref to DB37?

Hi

Is there an easy place to pick up a 5v reference signal from the Basic MS3 main board to feed it through to one of the unused DB37 pins?

It'd make the wiring for some of the options a lot tidier compared to trying to pull it from the ECU connector loom and back round... I've got an external MAP sensor and a variable resistor for TC / LC adjustment that both are fed from the 5v feed but plumbed into the DB37...

Might be a nice feature for future revisions of your board

Thanks

Jon
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Old 03-17-2018, 04:28 PM
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It's already there? Pin 26.
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Old 03-17-2018, 04:34 PM
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Originally Posted by gooflophaze View Post
It's already there? Pin 26.
The documentation for my MS3 Basic shows DB37 pin 26 as the FLEX input.
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Old 03-17-2018, 04:37 PM
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Ah, sorry, just noticed this was MSLabs subforum so the pin count might be different. But you've got a 5v output coming out to drive the TPS, also known as vref.
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Old 03-17-2018, 04:53 PM
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Originally Posted by gooflophaze View Post
Ah, sorry, just noticed this was MSLabs subforum so the pin count might be different. But you've got a 5v output coming out to drive the TPS, also known as vref.
So that I understand what you're saying, the OP can pull the signal from 2I at the ECU connector (in the case of a 2000 NB1) and route it to one of the unused DB37 pins? Otherwise, the signal isn't present at the DB37 connector on the MS3Basic. Just asking because it's what he was originally going to do.
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Old 03-17-2018, 05:08 PM
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Yep - I want to pull 5v ref. from somewhere to a spare pin on the MSLabs DB37.

I was just wondering if there's a 'nice' place to source the 5V from (like an unused pad on the main PCB), rather than trying to tack a wire onto the back of the ECU socket..
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Old 03-18-2018, 04:58 AM
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Please post your ECU's serial number. Different revisions and MY versions may have slightly different DB37 pinouts.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 03-18-2018, 05:34 AM
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Hi,

ECU Serial number = 12643

Thanks!

Jon
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Old 03-18-2018, 08:32 AM
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You can get 5V from pin 9 of the serial connector. You can then add a wire from pin 9 to pin 34 on the DB37, which is a free pin on this ECU version (3.0b). Other ECU versions may have this pin already in use.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 03-18-2018, 02:09 PM
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Thanks!

As said maybe something to consider for your future board revisions - makes the wiring a lot tidier
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Old 03-18-2018, 04:13 PM
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The current revision does have 5V and a LOT more I/O on the DB37, among other improvements.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 03-20-2018, 07:58 AM
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Hi

Pin 34 on the DB37 is used as it's got an optional ABS sensor speed input.

Also - as it's got an optional internal barometric sensor, what input is this connected to? The basemap you sent doesn't have it enabled...

Thanks!

Jon

Last edited by jonboy; 03-20-2018 at 03:43 PM.
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Old 03-23-2018, 10:25 AM
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My mistake - 34 is free as you say....

Any suggestion as to which ADC the optional internal barometric sensor is connected to?

Thanks!
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