Load cell handbreak

  • Thread starter mburisin
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M

mburisin

8
Czech Republic
Czech Republic
Hi,

I'm thinking about building DYI handbrake with load cell.

From various threads I went through, I figured I would need:

Handbrake

Joystick Controller - Leobodnar

Leobodnar connection scheme:

upload_2017-12-22_12-49-49.png


Load Cell - this load cell is rated for 50 kg, which should be plenty for handbreak, what do you think? Is this one OK for use in handbrake or would you suggest different one?

I don't have much knowledge about electronics, from various DYI threads, I found out, that the load cell is giving very small output, would I need amplifier when used with Leobodnar joystick controller?

I have found this Amplifier or this Amplifier or this Amplifier, would any of these work with Leobodnar joystick controller? How to hook it up to load cell which has 5 cables? I haven't found much info about these load cell cables.

I'm from Europe, so shipping from US is a bit of trouble, much easier would be for me parts from Aliexpress for example.

I'm not sure I will be able to make this work, as I probably would't be able to make some custom amplifier board I have seen on other threads. I would have to use what is available for example on Aliexpress etc. and then just hook it up, if that would be possible at all.

If I manage to pull it together, I would try to make some step by step tutorial for someone not so proficient in electronics as well :)

I would be grateful for any help.

Thanks!

Michal
 
GTP_Remo
50kg load cell for a hand brake? A bit high don't you think.
Click to expand...

I'm not sure, but with some leverage on long handle, I think it isn't exceedingly high.

This one https://heusinkveld.com/products/shifters-handbrakes/sim-handbrake-2/?v=928568b84963 is 17 kg and it has quite short lever as opposed to this one Handbrake.

Also I think you can calibrate it via driver / controller what pressure is considered 100 % value of handbrake engagement. But I'm not sure, as I haven't built one before :)

What strength of load cell would you recommend? Thanks for the input.
 
Just seems high , my brake pedal load cell is only 31kg (70lbs) it takes a fair amount of pressure to get 100%

Like you said though a hand brake is a lever so the forces needed to be applied won't feel as high. I'm definitely interested in what you come up with, I'll be following this thread.
 
Myles B
IV also been reading up over the last few days from what iv read I'm hoping to get all I need for 80€ or less still trying work out a final parts list tho iv have found this thread if it helps ?
https://www.gtplanet.net/forum/threads/clubsport-and-csr-elite-pedals-handbrake-diy-info.280445/
Click to expand...

Thanks for the link.

I have found that mrbasher recommended in this thread using load cell like this:

https://www.robotshop.com/en/micro-load-cell-50-kg.html

and maybe suggesting that Leobodnar Joystick controller is in fact load cell amplifier. I will try to ask him directly. Does anyone know if Leobodnar joystick controller is in fact load cell amplifier as well and therefore it is possible to be used directly with load cell?

Otherwise I have found another controller boards on that site from mrbasher.

Phidgets PhidgetBridge Wheatstone Bridge Sensor Interface

https://www.robotshop.com/en/phidgetbridge-wheatstone-bridge-sensor-interface.html

One directly to the USB:

upload_2017-12-26_16-13-47.png

It says it's interface, but seems sophisticated enough to be amplifier as well.

Could this work with just connecting to the PC? Would it be recognized as joystick or not? If not, would it be possible to find some drivers for this?Connection seems pretty easy, 4 cables on load cell and 4 inputs on this board :)

Load Cell / Wheatstone Amplifier Shield (2ch)

https://www.robotshop.com/en/strain-gauge-load-cell-amplifier-shield-2ch.html

This one is just amplifier, which should then be connected to Arduino board and the to the PC.

However I'm not familiar with Arduino at all.

upload_2017-12-26_16-17-25.png


Does anyone has suggestion which road to take?
 
Now another idea :)

I have found Load Cell Amplifier directly from Leo Bodnar.

So using this:

Load cell

https://www.robotshop.com/en/micro-load-cell-50-kg.html

upload_2017-12-26_16-48-58.png



Load cell amplifier

http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=73&products_id=199

upload_2017-12-26_16-54-52.png


12-Bit Joystick Controller

http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=94&products_id=204

upload_2017-12-26_16-55-46.png


To the load cell amp 4 cables from load cell, three cables (pin connector) out of amplifier and then directly to joystick controller three pin conector and then via USB to PC?

They write it should be recognized as plug and play device automaticaly.

Do you see any problems here or this should work? Could it be that easy? :)

Thanks!
 
Looks good I was going to find a load cell like in the fanatec pedals. If that works than try to plug into my fanatc csp v2 pedals as I have a PS4 not PC
 
In the end I ordered:

Controller:

http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=94&products_id=297

upload_2017-12-29_20-38-7.png


It's designed specifically for load cells.

Load cell:

https://www.aliexpress.com/item/Alu...Weighing-Sensor-130mm-x-30mm/32746646774.html


upload_2017-12-29_20-39-57.png


I hope, it will fit together.

Does anybody know how to connect it?

Controller board has input for 4 wires:

upload_2017-12-29_20-42-0.png


1) 5V
2) + in
3) - in
4) GND

Load cell has 5 wires:

upload_2017-12-29_20-44-11.png


a) Red: + (input);
b) White: - (output);
c) Black: - (input);
d) Green: + (output).
e) Another black (the fat one), they don't write in specification what is it for, possibly ground?

What wire of load cell fit into which slot on the controller board?

Many thanks!

Now it's waiting until delivery :)

I will deal with mechanical part of assembly when components arrive.
 

Attachments

  • upload_2017-12-29_20-43-20.png
    upload_2017-12-29_20-43-20.png
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On the load cell I have

White +5v
Green gnd
Red +sense (+in)
Black - sense (-in)

your extra wire is probably a cable screen so just leave it disconnected.
 
Myles B
Wow my budget not that big lol sweet set up
Click to expand...
First, one good way to be sure about the capacity of the load cell to choose is to do quick research on the maximum amount of force that a human can apply to a handbrake. Second, you will definitely need an instrumentation amplifier except if your load cell has an inbuilt one. You can get a reliable load cell, a good amplifier device, and even load cell indicators, all calibrated to suit your requirements from Tacuna Systems. Furthermore, You can get useful guides on how to set up a simple load measuring system from the links provided below:

a) https://tacunasystems.com/shop/

b) https://tacunasystems.com/knowledge...ips/electrical-connections-force-transducers/

c) https://tacunasystems.com/knowledge-base/force-measurement-tips/force-sensor-daq/
 
Last edited:

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