Working on turning a non-working TWCS throttle into a modular setup using an STM32 (Blue Pill) + hall sensor.

Here’s where I’m at right now👇

Current progress (see photos)

Pic 1/2 – GX12 power connector (build)

• Started wiring a GX12 4-pin for power/USB
• Mapping:
  • Red → VCC
  • White → D-
  • Green → D+
  • Black → GND
• Added sleeve + strain relief

Pic 3 – Slider upgrade

• Custom 3D printed carriage (Ordered Online)
• Much smoother than stock so far

Pic 4 – Walls prototype

• Early structure tests for expanding the housing
• Trying to add ~2 cm space without affecting movement

Pic 5 – Cardboard housing (electronics)

• Used to leave original housing free to "upgrade."
• First mockup to test internal layout
• Helps visualize cable routing and spacing

Pic 6 –Full cardboard prototype (working)

• Breadboard setup with all original buttons working
• Validating full system before committing to final design

What I’ve done so far (short version)

• Replaced throttle axis with hall sensor (AS5600)
• Flashed STM32 + configured in FreeJoyQt
• Mapped original grip PCB wiring
• Rebuilt rails + prototype housing (cardboard → printed parts)
• Started working on modular connections (GX12 / GX16)

Current focus

• Expanding housing (~+2 cm) to fit everything internally
• Designing a proper connector mount on the slider
• Cleaning up wiring layout

Challenges

• Hall sensor alignment still needs fine-tuning
• Keeping everything modular without overcomplicating it
• Making sure nothing interferes with slider movement

Next steps

• Place all GX16 connections
• Move electronics inside the housing
• Finalize connector mounting
• Lock down internal layout
• Preparation to make the grip replaceable

If anyone has experience with:

• TWCS mods
• Hall sensor alignment
• Modular HOTAS setups

I’d appreciate any input.

More updates coming as I refine this.