Decoding HID multipoint touchscreen messages?

[amundsen]

Hello,

I would like to connect a Teensy 3.2 to a HID 10-points capacitive touch monitor through the USB port and decode all the touch data.

Is it a difficult or an easy task? Any insight about where to begin?

Thank you in advance.

 

[PaulStoffregen]

Teensy 3.2 is a USB device. So is a touchscreen monitor. USB devices never talk to each other. They only talk to a USB host.

Teensy 3.6 has a 2nd USB port which can run in host mode. Software is still in the early stages, so some fiddling would be needed to get this working. But it at least should be possible on 3.6.

 

[amundsen]

Could the Teensy 3.2 become a suitable USB host with this add-on? Then, would it function with the software developed for the 3.6?

 

[PaulStoffregen]

Yes, you can use the USB Host Shield library with that hardware.

Some of those boards only send 3.3V power to USB devices, so if your touchscreen needs 5V USB power you may have some hardware fiddling to do.