TT_392, 6 months ago

My microcontroller is actually reading data from the pen now. I need to tweak some of the resistor values (The incoming data is still clipping, and the integrator has some more range it could potentially use).

Currently using the RP2040 onboard ADC, which isn't great in terms of accuracy, and I also have a very small window in which to sample my signal. But I do have a footprint for an external ADC on the pcb, which might improve things.

#electronics #wacom

3 things are visible in this video. the foreground there is my hand moving a wacom pen around above a purple PCB, behind that there is my oscilloscope, showing the strength and state of all the bits in the data package. In the background, there is an arduino serial plotter, showing the strength of all these signals. The serial data seems to have some jumpy data sometimes, but mostly looks alright.