Multi-Point Haptic Feedback System For VR Gaming Application

Custom designed and 3D printed solenoid actuator array, with Arduino + Unity to simulate and control. 

As a videographer, I always get fascinated by the motion graphics and animations, if used correctly it could tell a story in such elegant way, which made me think, what if we can do animation with hardware?

This project aims to use the sense of touch, to convey a message to the user, for applications in virtual reality.

This project is a part of VR Controller semester project 

During my research, I found that many in-lens image stabilizing systems were similar to my concept, so I decided to teardown one of my busted camera lens open, and investigate. 

Key Update #1 :

Prototype #3’s membrane mechanism was too strong for solenoids to compress. Instead of using a membrane to retract the impact rod, I decided to add another coil to pull the impact rod back. It also reduced response time dramatically, allowing the unit to refresh faster and more predictable.

Key Update #2 : 

While testing prototype #3, I found that putting two neodymium magnets in close proximity will interference with each other, causing the magnets not to retract properly. Accidentally I found if I flip the magnet polarity every other unit, it will solve this problem, and the interference will work for me to retract the magnets faster.

After prototype #4, I think it was mature enough to do further testing. 

So I created a 10x configuration to test if it can convey a message with different animation.

I knew that I will update the design in the future, so I created a modular circuit layout, everything just snaps together, I can swap/update individual part separately without remaking the whole thing.

Haptic Units & Flyback Diodes (Final prototype showing) —> Transistors & Positive Terminal —> Resistors & Ground Terminal

To create haptic feedback, you will need something that you can react to.

To create the environment, I used Unity in combination with a plug-in “Uduino.”

Uduino allows Arduino to communicate with Unity in real-time.

Key Updates :

1. Replaced stoppers with silicone o-rings for noise reduction / smoother operation

2. Optimized system performance, increased power efficiency and reduced heat.

3. Reduced size, from 17mm to 14.5mm apart.