Auto Manual idea - Can MaxxEcu do this?

[Cobranut]

Cobranut, I agree with Kinger, that's impressive work on the strain gauge fab.
Any chance you can supply links to the strain gauge and rotary sensor you used? Maybe a schematic for the amplifier module? That would be awesome info for the rest of us DIY geeks!

I'll dig those up and post them when I can find them.
I also have some pics I'll share as well.

[Cobranut]

Here are the load cells I found.  I'm not sure which one I used, but I tried both to see which gave the best range with the force needed to shift my transmission.

https://www.phidgets.com/?prodid=225https://www.phidgets.com/?prodid=226

I did talk to Phidgets about using one of their amplifier modules, but theirs all output to a digital interface, and I needed a simple 0-5v output for the ECU.
I found a design online and built it on a small pc breadboard, and had a friend 3d print a small box, in which I will encapsulate it in RTV to prevent moisture or other damage.

[Cobranut]

Here are the mechanical drawing of the load cell and the chip I used.
I'll scan my schematic and post it when I can.

I also think I used the Piher rotary sensor for gear position.  I machined simple aluminum adapters to interface it with the transmission.

[cholmes]

Man, only $7 for the load cell? That's cheap! Looking forward to photos and schematic, thanks!

[Cobranut]

Man, only $7 for the load cell? That's cheap! Looking forward to photos and schematic, thanks!

Yeah.  They're not lab quality, but all we're looking for is am I pushing or pulling hard enough to shift.

I first considered making a pivoting knob and using microswitches and springs, but when I found the cheap load cells I figured that would be a better solution.  The shift force can be tuned in the ECU.

I just got back from a vacation in the Philippines a few days ago, and still catching up on stuff.
I'll get back to looking up the info in a few days.

[cholmes]

No hurry, this is the sort of info that's nice to have bookmarked for future projects.
I'm putting a Jerico 4-speed in a road racing FC, gonna keep it simple at first, this would be a nice future upgrade for no-lift upshifts.

Looking forward to seeing more, thanks for the effort in providing it!