Multi-Touch-Kit-ProMicro

As the title suggests, this project is trying to reproduce the result of Multi-Touch kit with a ProMicro board.

Demo

https://user-images.githubusercontent.com/51289140/219960157-e1035877-1ed2-4f21-ac63-bcd13f59a0d3.mp4

The demo is using the source code from "experiment" branch (See Note.2)

The two axis in the demo is a mess, but I am not planning to fixed it in short term.

Preparation

In this repo:

• A python script to create the grid
• A KiCad project for the pcb design
• The source code for the ProMicro
• Clone of Multi-Touch Kit Processing code

Not in the repo:

• PlatformIO
• Processing

Procedure

Most steps is following the Multi-Touch Kit Project

1. Create a schemetic
2. Print out the PCB and prepare the components
3. Connect all pins and wires
4. Upload the code through PlatformIO
5. Use Processing to observe the result

Note

1. Readings from R1 seem having a lot of noise and effecting the result, so it is disabled.
2. "Experiment" branch seem to have a better performance. I am trying to figure out the reason, feel free to comment in the issue.

Reference:

• Multi-Touch Kit
  • The Starting point of this project
• Sensor Design Guidelines
  • More detail about pcb design can be found here.
  • The python script for generating grid is base on this document.
• Pro Micro & Fio V3 Hookup Guide
  • Pin layout about ProMicro

Future Plan

• [ ] Learn about USB-HID
  • https://www.usb.org/hid
  • https://docs.kernel.org/hid/index.html
  • https://learn.microsoft.com/en-us/windows-hardware/design/component-guidelines/touchpad-sample-report-descriptors
  • https://github.com/smulikHakipod/USB-Emulation/tree/master