r/HotasDIY • u/HairUpper2744 • 6d ago

NEED HELP WITH FORCE SENSING STICK

im trying to make an fssb like the f16 or f35 grip and im having a problem with the electronics . as an board i want to use the stm 32 blue pill with freejoy which i have used before but any project i have found use the hx711 instrument amplifier for connecting the loadcells to an arduino pro micro and they are not compatible with freejoy . my question is what should i use to connect the loadcells to freejoy and if you have a wiring diagram that would me great.

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u/Jpatty54 5d ago

I did this project with a pro micro and using arduino code. I also didnt know how to connect to bluepill.

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u/HairUpper2744 4d ago

What code did you use exactly and how did you connect the buttons (also I think you helped me before thx for that)

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u/Jpatty54 4d ago

Ok, i can share but im not at my computer until sunday or Monday.. ill share wiring and code np.

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u/Jpatty54 4d ago

Here is my project. Hope it helps you but any questions dm me.

https://www.reddit.com/r/HotasDIY/s/3tny7Vfy1U

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u/TheRedJMMonkey 5d ago

When I built mine a few years back, I used a STM32F411CEU6 (Blackpill) for the microcontroller and wrote my own firmware after finding a compatible library for the HX711.
The hardest part was just figuring out the USB descriptors since I didn't have much experience at the time working with STM32 microcontrollers. I found Waratah which made generating the correct descriptor pretty easy.

You can check out what I did here: https://github.com/TheRedJMMonkey/STM32_Joystick
Equivalent firmware for the Bluepill should be nearly identical.