The housing was made from fully CNC milled aluminum sheet metal which was partly black anodized. Behind a cut-out in the front panel we mounted a high-res AMOLED 8″ display. For the antenna and the polygraph we made a custom wire harness. The front-end control was based on WebSockets to synchronize it with the display of the sensory data and the questions. We tailored a native android app for data logging and the graph animations. We sampled the test person’s heart rate, muscle contraction, skin resistance and respiration around 1000 times per second. The time to develop all of this was around 3 weeks.
Note To Ourselves
Do not underestimate the importance of planning (be visual, create diagrams, keep them updated) and always have your basic hardware components in stock.