This week I spent time working on fleshing out the optical subsystem and power subsystem for the design report. I also spent some time analyzing the tradeoffs between our design choices and portraying those in tables to help better show how our design came about. For the optical subsystem, I spent time deriving the equations for how we calculated the CPI that will be used by our pen and I finalized which optical flow sensor we will be using for our design. Here is the CPI calculation for our pen:
For the power subsystem, I spent time deriving the equations for what our power system will look like and why we chose the battery we are going with. Here is the calculations for that:
One last thing I did this week outside of the design report stuff is I spent time working with the vender of the optical flow sensor to receive the proper optical flow sensor and datasheet that we want to use for our pen. The optical flow sensor has been received and now the biggest thing to work on is the PCB for it.
My progress is a little behind because I was hoping to have the PCB done and sent off before spring break but I was waiting for the vendor to approve of me receiving the datasheet and the sensor. This minor setback should be okay since I plan on finishing the PCB today and tomorrow so it can be sent off to the fab on Monday. So my main deliverables for this week is to finish the optical flow sensor PCB this weekend and spend next week setting up our microcontroller and working on the IMU implementation for the orientation of the pen while we wait to receive the PCB.