This past week, I continued work on the teams design report submission. I spent a considerable amount of time working on different parts of the report, formatting, and proofreading in order to ensure that our report met all necessary criteria and can carry over to the final report submission.
I also spent time working on the pressure sensor. I wrote all necessary code in order to connect the 16 sensors to the RPi. However, I then had to pivot in order to deal with the fact that there were only 2 addresses possible to be used with the ADCs instead of 4 as originally planned. In order to counteract this, I was able to find an analog 16-1 MUX, which I then attached to one pin of one ADC. Now, instead of using 16 different pins of the different ADC, I will be using one pin of the ADC, and using gpio outputs of the RPi as the select lines to the MUX, which will allow me to iterate through all 16 sensors. Furthermore, I began looking into the script necessary to send the data to the RPi server. In order to do this, I found that we could either use node or flask. Since Cora is more comfortable with node, and I do not have much experience with either, I have started writing the necessary http requests in order to send the data to the server. Our pivot plan in place is to switch to using flask if that leads to easier integration.
My progress is on schedule, as I used this break in order to catch up and finish up the preliminary work on the pressure sensor. After some more thorough testing to ensure it detects proper weight shift, I will sow up a mat in order to make it more movable / less obtrusive to the user.
This week, I hope to finish up testing of the pressure mat, and also work with Cora and Lilly to integrate sending the data to the server, so everyone can work with their necessary components of the project. I also hope to run some timing tests on the mat in order to ensure that it still meets latency requirements.