Our first prototype consisted of determining the ideal arrangement of sensors, wiring the sensors together and collecting data on weight change sensed during different types of movement.
This image depicts the markings of the individual load sensors and their distances apart lengthwise and widthwise from each other that we made on the first foam we worked on. We went on to replicate this (as accurately as we could) everytime we set up our prototype (which was everyday for a few weeks).
This image depicts us testing the sensors.
Our second prototype consists of load sensors detecting the weight distribution of the user, incorporating an auto-tare function (such that we do not have to keep re-taring every time a new user tested the prototype), and a vibration mechanism that would be activated for 5 seconds in 5 second intervals when insufficient motion (1kg change over two sensor sets) is detected for 2 hours.
Our final product will include the ability to automatically notify caregivers to flip/shift their patient via an app, and a neater and overall sleeker looking product. This will be achieved via an electrical box storing the wires, Arduino and 4 HX711s beside the mattress.