Dashboard PCB Replacement (CJH Design)

[The Hairy Camper]

Nice design, Rob. If it fits, do you mind sharing the original dimensions?

My best estimate was:
Length: 70mm
Height: 23mm
Trace Length along the bottom: 53mm

[TwinTurbo]

In this image the with of the PCB is 54mm or there abouts, i say ther abouts because the pitch between track and gap looks consistent and there are 27 gaps+tracks. 54/27 = 2mm which sounds like a nice Germanicaly metric number. 

[TwinTurbo]

Other than that the demensions are kept compact. 

[The Hairy Camper]

54mm is probably right. When I measured the multiplug connector, it looked as though that was 53mm long. It was starting to get dark outside though.

Let us know how the test fitting goes.

[TwinTurbo]

I think we can call that reasonable. 

[TwinTurbo]

DOPS Board, this is a bit of a stab in the dark as I was not 100% sure on the wiring. Managed to beter it out I think was confused as the circuit did not match the schematic. 

Found I had my schematic wrong on an LED, but the 3.9 K resistor was also ripped from the board.







 

[The Hairy Camper]

Nice design. Is this the board that sits behind the speedometer? Or is it part main dash ribbon PCB?

[TwinTurbo]

That's the ribbon replacement. Pushes onto the back of the speedo. I was looking to recreate the DOPS but there an unidentified IC on it so would be difficult recreate exactly.

[The Hairy Camper]

I think I know which part.

I thought about replicating it too when my buzzer of doom was playing up recently. It's an expensive and rare part to replace.

Mine looks to be in good condition, I suppose I could just replace resistors if it starts to go bad.

[TwinTurbo]

And the final bit for today.

Non Tacho - Guage Board

If anyone can get accurate dimensions of the tacho rear face, let me know.

[TwinTurbo]

The edge connector, DOPS Addapter and Guage Board are all with the PCB Manufacturer.. 

Cheers

Rob

[The Hairy Camper]

Nice design Rob. Looks like you'll have your prototype in no time!

Is there a standard thickness for these boards? I believe CJH said 1.6mm?

[TwinTurbo]

yes 1.6mm

Thank for the comment and Covid for my ability , during lockdown #1 i worked my dayjob from a makeshift desk ( back legs were the kitchen radiator) in the kitchen. when i was getting down/depressed by work i learned KiCad. It's frustrating but Great to build stuff.

I bought a 3D printer in lockdown #1 too, and then re-learend 3D CAD.  I used that recently to proto an alternator bracket for a Ford Pinto.. Which was then machined by the same Chineese fab company for £80.. My Idea, My design. My ProtoType brought to life and solved a massive problem... 


I am going to incorporate a "flashing" option for LED6 as a very simple Alarm warning dummy.

I have some other ideas for 

[The Hairy Camper]

Cheers.

I'm glad something good came from the covid lock down for you then.

I remember CJH talked about using the vacant light slot as a low fuel warning light. What kind of alarm were you thinking of? A central locking type alarm?

[TwinTurbo]

purely a simple flashing LED option.


I already have my digidash plans and this workstream has hopefully resolved some questions so it will be worthwhile for my own plans.



its now easier to design what i need than adapt something else ( usualy ) but incorporating available submodulse massivly reduces effort.