Looking to commission an expert in capacitive touch PCB layout for new sensor

[TimB100]

Hi.

I'm looking to find an expert in the physics of capacitive touch systems. I need a layout designed (not finger touch related) for a new sensor.

There is a chap on you tube who knows his onions but cannot get hold of him.

https://youtu.be/ZHzaVzYEZbw

Thanks...

Tim

 

[BrianHG]

Are you planning to compete with Microchip's new capacitive gesture sensor technology?
Or just interested in purchasing their system?

[TimB100]

Hi

My design actually has nothing to do with finger touch sensing. It just so happens that the work done understanding how capacitive fields work is useful for my design requirements.

I want a PCB layout that will be on a flexible PCB. The PCB will be rolled into a tube and I need to sense what is inside the tube. EG its capacitance disturbance.

But I want the field to radiate inwards and be shielded on the out side.

Thanks

Tim
 

[DTJ]

Soil moisture sensor?

[alanb]

I vaguely remember that you can't charge the inside of a spherical surface, the charge resides on the outside. Not sure if this will impact what you are trying to do but it would be worth checking the physics before investing money in the project.

[colorado.rob]

I vaguely remember that you can't charge the inside of a spherical surface, the charge resides on the outside. Not sure if this will impact what you are trying to do but it would be worth checking the physics before investing money in the project.

What would than mean for a capacitor consisting of two concentric shells.