This week, I continued to integrate the sensors with the web extension. I initially ran into some issues with the voltage readings through the ADC to the RPi being inconsistent, but I was able to debug the soldering I did and modify some resistors to ensure that no voltage over the max 3.3V limit was ever being sent. I also had some problems with a faulty ground connection, which I debugged. Furthermore, I worked with Cora to begin integrating the sensor data with the extension. We currently are able to send and receive data on both ends. The next step for this is to send Cora only the calculated lean data (left/right/front/back) to ensure that the latency is minimized.
Another thing I did this week is ensure that all the data being sent was as accurate as possible. I worked with 2 mats and figured out the range of voltages that were needed in order to detect a lean. Since as my previous report mentioned, they are definitely not 0.5 pound shifts, I will work on modifying my algorithm of analyzing the data to still produce the most accurate data to send to the users.
A photo of the data I am getting when 1 sensor is pressed. Voltage from unpressed sensors is very variable (between .6 and .02 V), so a detection of 0.5 pounds is unfeasible. However, an overall lean detection is still feasible.
My progress is still on schedule, as I expect my integration with Cora to be finalized by the end of this week, which is in time for the demo day. I do not think the mat will be as presentable as it will be for the final presentation, but it will be functional enough.
This upcoming week, I hope to finalize integration of the mat with Cora, by sending finalized lean calculations instead of raw data. I also plan on integrating some pauses in my sending of data if I detect the user stands up, so they do not get any excess notifications occurring. I also plan on having a friend help test the mat with all 4 sensors, to ensure that the basic lean functionality does not present false data.