Shift light/output switches MS1-Ex Update: I win.

[BBR]

I am wanting to use the shift light function on the MS, but an sort of clueless as to how to get it set up.

The mega manual calls it out to be "pin 10", but does not tell you pin 10 of what.

Pin 10 of the chip?

Pin 10 of the db37?

If it is the chip, are any jumpers needed??? From where to where?


V2.2 board.

[dieselgeek]

Re: Shift light MS1-Extra

this is a GREAT mod to do. I have a lot of guys using it.

They mean "pin 10 of the CPU" - start at the corner with the "dot" and count from there, around the chip.

Then just follow the instructions. You can also do the "3-stage" light using two pins, it's a little more complex but with a batch of LEDs you can eliminate the need for a tach altogether.


to get the wire out into your harness, use one of the "spare" pins in the DB37 connector that have jumper pads on the circuit board. There are either 4 or 8 depending on which board you have.

I usually use the X11, X12, X13 or X14 pads...

[BBR]

Re: Shift light MS1-Extra

Thanks. ;D

Looks, from reading the MS board that this is a very limited circuit current-wise. i.e. can't drive a light directly. Is that right?

[Matt Cramer]

Re: Shift light MS1-Extra

Right, the chip needs a little transistor circuit to drive the lights.

[BBR]

Re: Shift light MS1-Extra

Dammit.

[BBR]

Re: Shift light / output switches MS1-Extra

Zipped by RS and picked up the components need to make the little transistor circuit. I got enough to make 2 circuits so I can control the cooling fan with the MS too.

I believe the correct circuit is this:



Not being a schematic reader, any tips on which leg of the transistor is which? ;D

[BBR]

Re: Shift light / output switches MS1-Extra

Bueller..Bueller.. This thing on?


Should I mount these circuits INSIDE the MS somehow? Remember V2.2 = no proto area

[Matt Cramer]

Re: Shift light / output switches MS1-Extra

Got some pictures of the mod here:

http://www.diyautotune.com/tech_articles/common_megasquirt_modifications.htm#Add_Output_v3

While it's a V3 board, it should give you an idea which leg is which.

You can hot glue the transistors to the underside of the board, or get a bit of breadboard and stick the breadboard in the case lid.

[BBR]

Re: Shift light / output switches MS1-Extra

Gor get a bit of breadboard and stick the breadboard in the case lid.

Thanks for the idea. I did get a small board to build it on but didn't really just want it bouncing around in there. lol ;D

[BBR]

Re: Shift light/output switches MS1-Ex Update: Circuit layout

Hopefully I built this correctly. :-\

EDIT: TRANSISTORS ARE BACKWARDS IN THESE PICS

Here is the layout for switching 2 devices:



Since I am running a EEC-IV adapter board, I am going to just drill a small hole in the MS faceplate and run the two leads to the relays separate from the main MS to EEC-IV adapter cable. I made this about as small as I could and will fit it inside the MS case.

Here's the actual circuit.



Just wanted to post this before buttoning it all back up and possibly causing a fire. lol

As installed in the MS:

[dieselgeek]

Re: Shift light/output switches MS1-Ex Update: Circuit layout

you do clean work for a noob - that looks nice!

One thing, just make sure the daughterboard you made, isn't supported solely by the connecting wires. Eventually even stranded board will break from vibration, and the soldered ends will break pretty quickly too.

-scott

[BBR]

Re: Shift light/output switches MS1-Ex Update: Circuit layout

Thanks. ;D

I've had plenty of experience assembling electronics, but not so much reading schematics. I used to build ALDL converters for AKM Electronics in my spare time. I built a ka-friggin zillion of them for Andrew.

These thingys:


I certainly do need to come up with a way to support this thing since my MS mounts on it's side.

[BBR]

Re: Shift light/output switches MS1-Ex Update: Circuit layout

DAMMIT!
Transistors are in backwards.... It seemed to work on the meter, but it no worky in the truck.

I just transposed the E&C on my sketch I made for some idiotic reason.

[BBR]

Re: Shift light/output switches MS1-Ex Update: Circuit layout

Will this accomplish the same switching goal? My relay source for 12v is way out at the relay and I am just running 1 wire back to the MS for ground.

[Matt Cramer]

Re: Shift light/output switches MS1-Ex Update: Circuit layout AGAIN!

It's missing the flyback diodes. You can put them across the relays instead.