[B] Unfortunately over £40 each

A project log for Tetrinsic [gd0041]

A continuous, motorised fader that is pressure sensitive, haptic and water resistant.

kelvinakelvinA 06/17/2024 at 18:310 Comments

I'm not sure if I ever mentioned it anywhere, but one of my price targets for Tetrinsic was £20/ea.

While making this BOM, I determined that it was best to continue the strategy I had for the 11P cable to Tetent by making sure that I can't accidentally solder the LED strip backwards. At the same time, there isn't a 2P FPC. Instead of 2 separate cables, I'm going to use a single 7P cable. This saves both money and simplifies manufacturing. The pinout is below:

  1. 5V
  2. LED
  3. GND
  4. Force
  5. GND
  6. LED
  7. 5V

Then it's conveniently broken out with this through-hole connector:

This would allow me to create Tetrinsic separately to Tetoroidiv.

At this price, I'm further considering the potential for water resistance. The current limitations at the moment are:

In other news, this is how close to the wire everything is fitting:

The top flat bar corresponds to the total active length of the force sensor.

In other news, I've cobbled together a low-resolution render to finally replace the outdated one: