This week I managed to further test the IMU rotation and tilt for the pen to ensure that it is properly calibrated for the user to comfortably hold the pen. I also spent time thinking through some of the math for how to convert the titled version of the X and Y data from the optical flow sensor into a non-tilted version so that we can properly pass this data to the computer without any discrepancies. Here is the math for that:
Compensated dX = Sensor output dX / Cos(θ)
Compensated dY = Sensor output dY / Cos(Ψ)
My progress is still on track since the PCB and its components should arrive this Monday or Tuesday and I can spend time this week soldering the PCB together. My deliverables for next week is to solder the optical flow sensor PCB together, do some physical testing of the PCB to make sure it is functional, and look more into dynamic CPI adjustment based on how the user tilts the pen to ensure maximum accuracy.